Chapter 9 Tables

Table 1 Percent of Cross Section of Conduit and Tubing for Conductors and Cables

Number of Conductors

and/or Cables Cross-Sectional Area (%)

1 53

2 31

Over 2 40

Informational Note No. 1: Table 1 is based on common condi‐ tions of proper cabling and alignment of conductors where the length of the pull and the number of bends are within reasona‐ ble limits. It should be recognized that, for certain conditions, a larger size conduit or a lesser conduit fill should be considered.

Informational Note No. 2: When pulling three conductors or cables into a raceway, if the ratio of the raceway (inside diame‐ ter) to the conductor or cable (outside diameter) is between 2.8 and 3.2, jamming can occur. While jamming can occur when pulling four or more conductors or cables into a raceway, the probability is very low.

Notes to Tables

See Informative Annex C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring from physical damage.
Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation.
Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of
Table 2 Radius of Conduit and Tubing Bendstheir total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition.
For conductors not included in Chapter 9, such as multi‐ conductor cables and optical fiber cables, the actual dimensions shall be used.
For combinations of conductors of different sizes, use actual dimensions or Table 5 and Table 5A for dimen‐ sions of conductors and Table 4 for the applicable conduit or tubing dimensions.
When calculating the maximum number of conductors or cables permitted in a conduit or tubing, all of the same size (total cross-sectional area including insula‐ tion), the next higher whole number shall be used to determine the maximum number of conductors permit‐ ted when the calculation results in a decimal greater than or equal to 0.8. When calculating the size for conduit or tubing permitted for a single conductor, one conductor shall be permitted when the calculation results in a decimal greater than or equal to 0.8.
Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
A multiconductor cable, optical fiber cable, or flexible cord of two or more conductors shall be treated as a single conductor for calculating percentage conduit or tubing fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter. Assemblies of single insulated conduc‐ tors without an overall covering shall not be considered a cable when determining conduit or tubing fill area. The conduit or tubing fill for the assemblies shall be calculated based upon the individual conductors.
The values for approximate conductor diameter and area shown in Table 5 are based on worst-case scenario and indicate round concentric-lay-stranded conductors. Solid and round concentric-lay-stranded conductor values are grouped together for the purpose of Table 5. Round compact-stranded conductor values are shown in Table 5A. If the actual values of the conductor diameter and area are known, they shall be permitted to be used.

Conduit or Tubing Size One Shot and Full Shoe Benders Other Bends

Metric Designator	Trade Size	mm	in.	mm	in.
16	1∕2	101.6	4	101.6	4
21	3∕4	114.3	41∕2	127	5
27	1	146.05	53∕4	152.4	6
35	11∕4	184.15	71∕4	203.2	8
41	11∕2	209.55	81∕4	254	10
53	2	241.3	91∕2	304.8	12
63	21∕2	266.7	101∕2	381	15
78	3	330.2	13	457.2	18
91	31∕2	381	15	533.4	21
103	4	406.4	16	609.6	24
129	5	609.6	24	762	30
155	6	762	30	914.4	36

Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9)

Article 358 — Electrical Metallic Tubing (EMT)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
16	1∕2	78	0.122	118	0.182	104	0.161	61	0.094	15.8	0.622	196	0.304
21	3∕4	137	0.213	206	0.320	182	0.283	106	0.165	20.9	0.824	343	0.533
27	1	222	0.346	333	0.519	295	0.458	172	0.268	26.6	1.049	556	0.864
35	11∕4	387	0.598	581	0.897	513	0.793	300	0.464	35.1	1.380	968	1.496
41	11∕2	526	0.814	788	1.221	696	1.079	407	0.631	40.9	1.610	1314	2.036
53	2	866	1.342	1299	2.013	1147	1.778	671	1.040	52.5	2.067	2165	3.356
63	21∕2	1513	2.343	2270	3.515	2005	3.105	1173	1.816	69.4	2.731	3783	5.858
78	3	2280	3.538	3421	5.307	3022	4.688	1767	2.742	85.2	3.356	5701	8.846
91	31∕2	2980	4.618	4471	6.927	3949	6.119	2310	3.579	97.4	3.834	7451	11.545
103	4	3808	5.901	5712	8.852	5046	7.819	2951	4.573	110.1	4.334	9521	14.753

Article 362 — Electrical Nonmetallic Tubing (ENT)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
16	1∕2	73	0.114	110	0.171	97	0.151	57	0.088	15.3	0.602	184	0.285
21	3∕4	131	0.203	197	0.305	174	0.269	102	0.157	20.4	0.804	328	0.508
27	1	215	0.333	322	0.499	284	0.441	166	0.258	26.1	1.029	537	0.832
35	11∕4	375	0.581	562	0.872	497	0.770	291	0.450	34.5	1.36	937	1.453
41	11∕2	512	0.794	769	1.191	679	1.052	397	0.616	40.4	1.59	1281	1.986
53	2	849	1.316	1274	1.975	1125	1.744	658	1.020	52	2.047	2123	3.291
63	21∕2	—	—	—	—	—	—	—	—	—	—	—	—
78	3	—	—	—	—	—	—	—	—	—	—	—	—
91	31∕2	—	—	—	—	—	—	—	—	—	—	—	—

Article 348 — Flexible Metal Conduit (FMC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	30	0.046	44	0.069	39	0.061	23	0.036	9.7	0.384	74	0.116
16	1∕2	81	0.127	122	0.190	108	0.168	63	0.098	16.1	0.635	204	0.317
21	3∕4	137	0.213	206	0.320	182	0.283	106	0.165	20.9	0.824	343	0.533
27	1	211	0.327	316	0.490	279	0.433	163	0.253	25.9	1.020	527	0.817
35	11∕4	330	0.511	495	0.766	437	0.677	256	0.396	32.4	1.275	824	1.277
41	11∕2	480	0.743	720	1.115	636	0.985	372	0.576	39.1	1.538	1201	1.858
53	2	843	1.307	1264	1.961	1117	1.732	653	1.013	51.8	2.040	2107	3.269
63	21∕2	1267	1.963	1900	2.945	1678	2.602	982	1.522	63.5	2.500	3167	4.909
78	3	1824	2.827	2736	4.241	2417	3.746	1414	2.191	76.2	3.000	4560	7.069
91	31∕2	2483	3.848	3724	5.773	3290	5.099	1924	2.983	88.9	3.500	6207	9.621
103	4	3243	5.027	4864	7.540	4297	6.660	2513	3.896	101.6	4.000	8107	12.566

Article 342 — Intermediate Metal Conduit (IMC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	—	—	—	—	—	—	—	—	—	—	—	—
16	1∕2	89	0.137	133	0.205	117	0.181	69	0.106	16.8	0.660	222	0.342
21	3∕4	151	0.235	226	0.352	200	0.311	117	0.182	21.9	0.864	377	0.586(continues)

Article 342 — Intermediate Metal Conduit (IMC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
27	1	248	0.384	372	0.575	329	0.508	192	0.297	28.1	1.105	620	0.959
35	11∕4	425	0.659	638	0.988	564	0.873	330	0.510	36.8	1.448	1064	1.647
41	11∕2	573	0.890	859	1.335	759	1.179	444	0.690	42.7	1.683	1432	2.225
53	2	937	1.452	1405	2.178	1241	1.924	726	1.125	54.6	2.150	2341	3.630
63	21∕2	1323	2.054	1985	3.081	1753	2.722	1026	1.592	64.9	2.557	3308	5.135
78	3	2046	3.169	3069	4.753	2711	4.199	1586	2.456	80.7	3.176	5115	7.922
91	31∕2	2729	4.234	4093	6.351	3616	5.610	2115	3.281	93.2	3.671	6822	10.584
103	4	3490	5.452	5235	8.179	4624	7.224	2705	4.226	105.4	4.166	8725	13.631

Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-A*)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	50	0.077	75	0.115	66	0.102	39	0.060	12.6	0.495	125	0.192
16	1∕2	80	0.125	121	0.187	107	0.165	62	0.097	16.0	0.630	201	0.312
21	3∕4	139	0.214	208	0.321	184	0.283	107	0.166	21.0	0.825	346	0.535
27	1	221	0.342	331	0.513	292	0.453	171	0.265	26.5	1.043	552	0.854
35	11∕4	387	0.601	581	0.901	513	0.796	300	0.466	35.1	1.383	968	1.502
41	11∕2	520	0.807	781	1.211	690	1.070	403	0.626	40.7	1.603	1301	2.018
53	2	863	1.337	1294	2.006	1143	1.772	669	1.036	52.4	2.063	2157	3.343

*Corresponds to 356.2(1).

Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-B*)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	49	0.077	74	0.115	65	0.102	38	0.059	12.5	0.494	123	0.192
16	1∕2	81	0.125	122	0.188	108	0.166	63	0.097	16.1	0.632	204	0.314
21	3∕4	140	0.216	210	0.325	185	0.287	108	0.168	21.1	0.830	350	0.541
27	1	226	0.349	338	0.524	299	0.462	175	0.270	26.8	1.054	564	0.873
35	11∕4	394	0.611	591	0.917	522	0.810	305	0.474	35.4	1.395	984	1.528
41	11∕2	510	0.792	765	1.188	676	1.050	395	0.614	40.3	1.588	1276	1.981
53	2	836	1.298	1255	1.948	1108	1.720	648	1.006	51.6	2.033	2091	3.246

*Corresponds to 356.2(2).

N Article 356 — Liquidtight Flexible Nonmetallic Conduit (LFNC-C*)

Nominal Internal

Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	47.7	0.074	71.5	0.111	63.2	0.098	36.9	0.057	12.3	0.485	119.19	0.185
16	1∕2	77.9	0.121	116.9	0.181	103.2	0.160	60.4	0.094	15.7	0.620	194.778	0.302
21	3∕4	134.6	0.209	201.9	0.313	178.4	0.276	104.3	0.162	20.7	0.815	336.568	0.522
27	1	215.0	0.333	322.5	0.500	284.9	0.442	166.6	0.258	26.2	1.030	537.566	0.833
35	11∕4	380.4	0.590	570.6	0.884	504.1	0.781	294.8	0.457	34.8	1.370	951.039	1.474
41	11∕2	509.2	0.789	763.8	1.184	674.7	1.046	394.6	0.612	40.3	1.585	1272.963	1.973
53	2	847.6	1.314	1271.4	1.971	1123.1	1.741	656.9	1.018	51.9	2.045	2119.063	3.285

Metric

Trade

Over 2 Wires 40% 60% 1 Wire 53% 2 Wires 31%

Diameter Total Area 100%

*Corresponds to 356.2(3).

Article 350 — Liquidtight Flexible Metal Conduit (LFMC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	49	0.077	74	0.115	65	0.102	38	0.059	12.5	0.494	123	0.192
16	1∕2	81	0.125	122	0.188	108	0.166	63	0.097	16.1	0.632	204	0.314
21	3∕4	140	0.216	210	0.325	185	0.287	108	0.168	21.1	0.830	350	0.541
27	1	226	0.349	338	0.524	299	0.462	175	0.270	26.8	1.054	564	0.873
35	11∕4	394	0.611	591	0.917	522	0.810	305	0.474	35.4	1.395	984	1.528
41	11∕2	510	0.792	765	1.188	676	1.050	395	0.614	40.3	1.588	1276	1.981
53	2	836	1.298	1255	1.948	1108	1.720	648	1.006	51.6	2.033	2091	3.246
63	21∕2	1259	1.953	1888	2.929	1668	2.587	976	1.513	63.3	2.493	3147	4.881
78	3	1931	2.990	2896	4.485	2559	3.962	1497	2.317	78.4	3.085	4827	7.475
91	31∕2	2511	3.893	3766	5.839	3327	5.158	1946	3.017	89.4	3.520	6277	9.731
103	4	3275	5.077	4912	7.615	4339	6.727	2538	3.935	102.1	4.020	8187	12.692
129	5	—	—	—	—	—	—	—	—	—	—	—	—
155	6	—	—	—	—	—	—	—	—	—	—	—	—

Article 344 — Rigid Metal Conduit (RMC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	—	—	—	—	—	—	—	—	—	—	—	—
16	1∕2	81	0.125	122	0.188	108	0.166	63	0.097	16.1	0.632	204	0.314
21	3∕4	141	0.220	212	0.329	187	0.291	109	0.170	21.2	0.836	353	0.549
27	1	229	0.355	344	0.532	303	0.470	177	0.275	27.0	1.063	573	0.887
35	11∕4	394	0.610	591	0.916	522	0.809	305	0.473	35.4	1.394	984	1.526
41	11∕2	533	0.829	800	1.243	707	1.098	413	0.642	41.2	1.624	1333	2.071
53	2	879	1.363	1319	2.045	1165	1.806	681	1.056	52.9	2.083	2198	3.408
63	21∕2	1255	1.946	1882	2.919	1663	2.579	972	1.508	63.2	2.489	3137	4.866
78	3	1936	3.000	2904	4.499	2565	3.974	1500	2.325	78.5	3.090	4840	7.499
91	31∕2	2584	4.004	3877	6.006	3424	5.305	2003	3.103	90.7	3.570	6461	10.010
103	4	3326	5.153	4990	7.729	4408	6.828	2578	3.994	102.9	4.050	8316	12.882
129	5	5220	8.085	7830	12.127	6916	10.713	4045	6.266	128.9	5.073	13050	20.212
155	6	7528	11.663	11292	17.495	9975	15.454	5834	9.039	154.8	6.093	18821	29.158

Article 352 — Rigid PVC Conduit (PVC), Schedule 80

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2		mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	—	—		—	—	—	—	—	—	—	—	—	—
16	1∕2	56	0.087		85	0.130	75	0.115	44	0.067	13.4	0.526	141	0.217
21	3∕4	105	0.164		158	0.246	139	0.217	82	0.127	18.3	0.722	263	0.409
27	1	178	0.275		267	0.413	236	0.365	138	0.213	23.8	0.936	445	0.688
35	11∕4	320	0.495		480	0.742	424	0.656	248	0.383	31.9	1.255	799	1.237
41	11∕2	442	0.684		663	1.027	585	0.907	342	0.530	37.5	1.476	1104	1.711
53	2	742	1.150		1113	1.725	983	1.523	575	0.891	48.6	1.913	1855	2.874
63	21∕2	1064	1.647		1596	2.471	1410	2.183	825	1.277	58.2	2.290	2660	4.119
78	3	1660	2.577		2491	3.865	2200	3.414	1287	1.997	72.7	2.864	4151	6.442
91	31∕2	2243	3.475		3365	5.213	2972	4.605	1738	2.693	84.5	3.326	5608	8.688
103	4	2907	4.503		4361	6.755	3852	5.967	2253	3.490	96.2	3.786	7268	11.258
129	5	4607	7.142		6911	10.713	6105	9.463	3571	5.535	121.1	4.768	11518	17.855
155	6	6605	10.239		9908	15.359	8752	13.567	5119	7.935	145.0	5.709	16513	25.598

Articles 352 and 353 — Rigid PVC Conduit (PVC), Schedule 40, and HDPE Conduit (HDPE)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
12	3∕8	—	—	—	—	—	—	—	—	—	—	—	—
16	1∕2	74	0.114	110	0.171	97	0.151	57	0.088	15.3	0.602	184	0.285
21	3∕4	131	0.203	196	0.305	173	0.269	101	0.157	20.4	0.804	327	0.508
27	1	214	0.333	321	0.499	284	0.441	166	0.258	26.1	1.029	535	0.832
35	11∕4	374	0.581	561	0.872	495	0.770	290	0.450	34.5	1.360	935	1.453
41	11∕2	513	0.794	769	1.191	679	1.052	397	0.616	40.4	1.590	1282	1.986
53	2	849	1.316	1274	1.975	1126	1.744	658	1.020	52.0	2.047	2124	3.291
63	21∕2	1212	1.878	1817	2.817	1605	2.488	939	1.455	62.1	2.445	3029	4.695
78	3	1877	2.907	2816	4.361	2487	3.852	1455	2.253	77.3	3.042	4693	7.268
91	31∕2	2511	3.895	3766	5.842	3327	5.161	1946	3.018	89.4	3.521	6277	9.737
103	4	3237	5.022	4855	7.532	4288	6.654	2508	3.892	101.5	3.998	8091	12.554
129	5	5099	7.904	7649	11.856	6756	10.473	3952	6.126	127.4	5.016	12748	19.761
155	6	7373	11.427	11060	17.140	9770	15.141	5714	8.856	153.2	6.031	18433	28.567

Article 352 — Type A, Rigid PVC Conduit (PVC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
16	1∕2	100	0.154	149	0.231	132	0.204	77	0.119	17.8	0.700	249	0.385
21	3∕4	168	0.260	251	0.390	222	0.345	130	0.202	23.1	0.910	419	0.650
27	1	279	0.434	418	0.651	370	0.575	216	0.336	29.8	1.175	697	1.084
35	11∕4	456	0.707	684	1.060	604	0.937	353	0.548	38.1	1.500	1140	1.767
41	11∕2	600	0.929	900	1.394	795	1.231	465	0.720	43.7	1.720	1500	2.324
53	2	940	1.459	1410	2.188	1245	1.933	728	1.131	54.7	2.155	2350	3.647
63	21∕2	1406	2.181	2109	3.272	1863	2.890	1090	1.690	66.9	2.635	3515	5.453
78	3	2112	3.278	3169	4.916	2799	4.343	1637	2.540	82.0	3.230	5281	8.194
91	31∕2	2758	4.278	4137	6.416	3655	5.668	2138	3.315	93.7	3.690	6896	10.694
103	4	3543	5.489	5315	8.234	4695	7.273	2746	4.254	106.2	4.180	8858	13.723
129	5	—	—	—	—	—	—	—	—	—	—	—	—
155	6	—	—	—	—	—	—	—	—	—	—	—	—

Article 352 — Type EB, Rigid PVC Conduit (PVC)

Metric	Trade	Over 2 Wires40%	60%	1 Wire53%	2 Wires31%	Nominal Internal Diameter	Total Area 100%
Designator	Size	mm2	in.2	mm2	in.2	mm2	in.2	mm2	in.2	mm	in.	mm2	in.2
16	1∕2	—	—	—	—	—	—	—	—	—	—	—	—
21	3∕4	—	—	—	—	—	—	—	—	—	—	—	—
27	1	—	—	—	—	—	—	—	—	—	—	—	—
35	11∕4	—	—	—	—	—	—	—	—	—	—	—	—
41	11∕2	—	—	—	—	—	—	—	—	—	—	—	—
53	2	999	1.550	1499	2.325	1324	2.053	774	1.201	56.4	2.221	2498	3.874
63	21∕2	—	—	—	—	—	—	—	—	—	—	—	—
78	3	2248	3.484	3373	5.226	2979	4.616	1743	2.700	84.6	3.330	5621	8.709
91	31∕2	2932	4.546	4397	6.819	3884	6.023	2272	3.523	96.6	3.804	7329	11.365
103	4	3726	5.779	5589	8.669	4937	7.657	2887	4.479	108.9	4.289	9314	14.448
129	5	5726	8.878	8588	13.317	7586	11.763	4437	6.881	135.0	5.316	14314	22.195
155	6	8133	12.612	12200	18.918	10776	16.711	6303	9.774	160.9	6.336	20333	31.530

Table 5 Dimensions of Insulated Conductors and Fixture Wires

Type

Size (AWG or kcmil)

Approximate Area Approximate Diameter mm2 in.2 mm in.

Type: FFH-2, RFH-1, RFH-2, RFHH-2, RHH*, RHW* , RHW-2*, RHH, RHW, RHW-2, SF-1, SF-2, SFF-1, SFF-2, TF, TFF, THHW, THW, THW-2, TW, XF, XFF

RFH-2, FFH-2, RFHH-2	1816	9.35511.10	0.01450.0172	3.4543.759	0.1360.148
RHH, RHW, RHW-2	1412	18.9022.77	0.02930.0353	4.9025.385	0.1930.212
10864321	28.1953.8767.1686.0098.13112.9171.6	0.04370.08350.10410.13330.15210.17500.2660	5.9948.2809.24610.4611.1811.9914.78	0.2360.3260.3640.4120.4400.4720.582
1/02/03/04/0	196.1226.1262.7306.7	0.30390.35050.40720.4754	15.8016.9718.2919.76	0.6220.6680.7200.778
250300350400500600	405.9457.3507.7556.5650.5782.9	0.62910.70880.78700.86261.00821.2135	22.7324.1325.4326.6228.7831.57	0.8950.9501.0011.0481.1331.243
7007508009001000	874.9920.8965.010571143	1.35611.42721.49571.63771.7719	33.3834.2435.0536.6838.15	1.3141.3481.3801.4441.502
1250150017502000	1515173819592175	2.34792.69383.03573.3719	43.9247.0449.9452.63	1.7291.8521.9662.072
SF-2, SFF-2	181614	7.4198.96811.10	0.01150.01390.0172	3.0733.3783.759	0.1210.1330.148
SF-1, SFF-1	18	4.194	0.0065	2.311	0.091
RFH-1,TF, TFF, XF, XFF	18	5.161	0.0088	2.692	0.106
TF, TFF, XF, XFF	16	7.032	0.0109	2.997	0.118
TW, XF, XFF, THHW, THW, THW-2	14	8.968	0.0139	3.378	0.133
TW, THHW, THW, THW-2	12108	11.6815.6828.19	0.01810.02430.0437	3.8614.4705.994	0.1520.1760.236
RHH, RHW, RHW-2*	14	13.48	0.0209	4.140	0.163
RHH, RHW, RHW-2*, XF, XFF	12	16.77	0.0260	4.623	0.182

Type: RHH*, RHW*, RHW-2*, THHN, THHW, THW, THW-2, TFN, TFFN, THWN, THWN-2, XF, XFF

RHH,* RHW,* RHW-2,* XF, XFF

21.48

0.0333

5.232

0.206

(continues)

Table 5 Continued

RHH, RHW, RHW-2*	8	35.87	0.0556	6.756	0.266
TW, THW, THHW, THW-2,	6	46.84	0.0726	7.722	0.304
RHH, RHW, RHW-2*	4	62.77	0.0973	8.941	0.352
	3	73.16	0.1134	9.652	0.380
	2	86.00	0.1333	10.46	0.412
	1	122.6	0.1901	12.50	0.492
	1/0	143.4	0.2223	13.51	0.532
	2/0	169.3	0.2624	14.68	0.578
	3/0	201.1	0.3117	16.00	0.630
	4/0	239.9	0.3718	17.48	0.688
	250	296.5	0.4596	19.43	0.765
	300	340.7	0.5281	20.83	0.820
	350	384.4	0.5958	22.12	0.871
	400	427.0	0.6619	23.32	0.918
	500	509.7	0.7901	25.48	1.003
	600	627.7	0.9729	28.27	1.113
	700	710.3	1.1010	30.07	1.184
	750	751.7	1.1652	30.94	1.218
	800	791.7	1.2272	31.75	1.250
	900	874.9	1.3561	33.38	1.314
	1000	953.8	1.4784	34.85	1.372
	1250	1200	1.8602	39.09	1.539
	1500	1400	2.1695	42.21	1.662
	1750	1598	2.4773	45.11	1.776
	2000	1795	2.7818	47.80	1.882
TFN, TFFN	1816	3.5484.645	0.00550.0072	2.1342.438	0.0840.096
THHN, THWN, THWN-2	14	6.258	0.0097	2.819	0.111
	12	8.581	0.0133	3.302	0.130
	10	13.61	0.0211	4.166	0.164
	8	23.61	0.0366	5.486	0.216
	6	32.71	0.0507	6.452	0.254
	4	53.16	0.0824	8.230	0.324
	3	62.77	0.0973	8.941	0.352
	2	74.71	0.1158	9.754	0.384
	1	100.8	0.1562	11.33	0.446
	1/0	119.7	0.1855	12.34	0.486
	2/0	143.4	0.2223	13.51	0.532
	3/0	172.8	0.2679	14.83	0.584
	4/0	208.8	0.3237	16.31	0.642
	250	256.1	0.3970	18.06	0.711
	300	297.3	0.4608	19.46	0.766

Type

Size (AWG or kcmil)

Approximate Area Approximate Diameter mm2 in.2 mm in.

Type: FEP, FEPB, PAF, PAFF, PF, PFA, PFAH, PFF, PGF, PGFF, PTF, PTFF, TFE, THHN, THWN, THWN-2, Z, ZF, ZFF, ZHF

THHN, THWN, THWN-2	350	338.2	0.5242	20.75	0.817
	400	378.3	0.5863	21.95	0.864
	500	456.3	0.7073	24.10	0.949
	600	559.7	0.8676	26.70	1.051
	700	637.9	0.9887	28.50	1.122
	750	677.2	1.0496	29.36	1.156
	800	715.2	1.1085	30.18	1.188
	900	794.3	1.2311	31.80	1.252
	1000	869.5	1.3478	33.27	1.310

(continues)

Table 5 Continued

PF, PGFF, PGF, PFF, PTF, PAF, PTFF, PAFF	1816	3.7424.839	0.00580.0075	2.1842.489	0.0860.098
PF, PGFF, PGF, PFF, PTF, PAF, PTFF, PAFF, TFE, FEP, PFA, FEPB, PFAH	14	6.452	0.0100	2.870	0.113
TFE, FEP, PFA, FEPB, PFAH	12	8.839	0.0137	3.353	0.132
	10	12.32	0.0191	3.962	0.156
	8	21.48	0.0333	5.232	0.206
	6	30.19	0.0468	6.198	0.244
	4	43.23	0.0670	7.417	0.292
	3	51.87	0.0804	8.128	0.320
	2	62.77	0.0973	8.941	0.352
TFE, PFAH, PFA	1	90.26	0.1399	10.72	0.422
TFE, PFA, PFAH, Z	1/0	108.1	0.1676	11.73	0.462
	2/0	130.8	0.2027	12.90	0.508
	3/0	158.9	0.2463	14.22	0.560
	4/0	193.5	0.3000	15.70	0.618
ZF, ZFF, ZHF	1816	2.9033.935	0.00450.0061	1.9302.235	0.0760.088
Z, ZF, ZFF, ZHF	14	5.355	0.0083	2.616	0.103
Z	12	7.548	0.0117	3.099	0.122
	10	12.32	0.0191	3.962	0.156
	8	19.48	0.0302	4.978	0.196
	6	27.74	0.0430	5.944	0.234
	4	40.32	0.0625	7.163	0.282
	3	55.16	0.0855	8.382	0.330
	2	66.39	0.1029	9.195	0.362
	1	81.87	0.1269	10.21	0.402

Type

Size (AWG or kcmil)

Approximate Area Approximate Diameter mm2 in.2 mm in.

Type: KF-1, KF-2, KFF-1, KFF-2, XHH, XHHW, XHHW-2, ZW

XHHW, ZW, XHHW-2, XHH	14	8.968	0.0139	3.378	0.133
	12	11.68	0.0181	3.861	0.152
	10	15.68	0.0243	4.470	0.176
	8	28.19	0.0437	5.994	0.236
	6	38.06	0.0590	6.960	0.274
	4	52.52	0.0814	8.179	0.322
	3	62.06	0.0962	8.890	0.350
	2	73.94	0.1146	9.703	0.382

(continues)

Table 5 Continued

XHHW, XHHW-2, XHH	1	98.97	0.1534	11.23	0.442
	1/0	117.7	0.1825	12.24	0.482
	2/0	141.3	0.2190	13.41	0.528
	3/0	170.5	0.2642	14.73	0.58
	4/0	206.3	0.3197	16.21	0.638
	250	251.9	0.3904	17.91	0.705
	300	292.6	0.4536	19.30	0.76
	350	333.3	0.5166	20.60	0.811
	400	373.0	0.5782	21.79	0.858
	500	450.6	0.6984	23.95	0.943
	600	561.9	0.8709	26.75	1.053
	700	640.2	0.9923	28.55	1.124
	750	679.5	1.0532	29.41	1.158
	800	717.5	1.1122	30.23	1.190
	900	796.8	1.2351	31.85	1.254
	1000	872.2	1.3519	33.32	1.312
	1250	1108	1.7180	37.57	1.479
	1500	1300	2.0156	40.69	1.602
	1750	1492	2.3127	43.59	1.716
	2000	1682	2.6073	46.28	1.822
KF-2, KFF-2	18	2.000	0.003	1.575	0.062
	16	2.839	0.0043	1.88	0.074
	14	4.129	0.0064	2.286	0.090
	12	6.000	0.0092	2.743	0.108
	10	8.968	0.0139	3.378	0.133
KF-1, KFF-1	18	1.677	0.0026	1.448	0.057
	16	2.387	0.0037	1.753	0.069
	14	3.548	0.0055	2.134	0.084
	12	5.355	0.0083	2.616	0.103
	10	8.194	0.0127	3.226	0.127

Type

Size (AWG or kcmil)

Approximate Area Approximate Diameter mm2 in.2 mm in.

*Types RHH, RHW, and RHW-2 without outer covering.

Table 5A Compact Copper and Aluminum Building Wire Nominal Dimensions* and Areas

Bare

Size		Approximate	Approximate	Approximate	Approximate	Approximate	Approximate	Approximate	Approximate	Size
(AWG	Diameter	Diameter	Area	Diameter	Area	Diameter	Area	Diameter	Area	(AWG
or kcmil)	mm in.	mm in.	mm2 in.2	mm in.	mm 2 in.2	mm in.	mm2 in.2	mm in.	mm2 in.2	or kcmil)

Conductor Types RHH**, RHW**, or USE Types THW and THHW Type THHN Type XHHW

8	3.404	0.134	6.604	0.260	34.25	0.0531	6.477	0.255	32.90	0.0510	—	—	—	—	5.690	0.224	25.42	0.0394	8
6	4.293	0.169	7.493	0.295	44.10	0.0683	7.366	0.290	42.58	0.0660	6.096	0.240	29.16	0.0452	6.604	0.260	34.19	0.0530	6
4	5.410	0.213	8.509	0.335	56.84	0.0881	8.509	0.335	56.84	0.0881	7.747	0.305	47.10	0.0730	7.747	0.305	47.10	0.0730	4
2	6.807	0.268	9.906	0.390	77.03	0.1194	9.906	0.390	77.03	0.1194	9.144	0.360	65.61	0.1017	9.144	0.360	65.61	0.1017	2
1	7.595	0.299	11.81	0.465	109.5	0.1698	11.81	0.465	109.5	0.1698	10.54	0.415	87.23	0.1352	10.54	0.415	87.23	0.1352	1
1/0	8.534	0.336	12.70	0.500	126.6	0.1963	12.70	0.500	126.6	0.1963	11.43	0.450	102.6	0.1590	11.43	0.450	102.6	0.1590	1/0
2/0	9.550	0.376	13.72	0.540	147.8	0.2290	13.84	0.545	150.5	0.2332	12.57	0.495	124.1	0.1924	12.45	0.490	121.6	0.1885	2/0
3/0	10.74	0.423	14.99	0.590	176.3	0.2733	14.99	0.590	176.3	0.2733	13.72	0.540	147.7	0.2290	13.72	0.540	147.7	0.2290	3/0
4/0	12.07	0.475	16.26	0.640	207.6	0.3217	16.38	0.645	210.8	0.3267	15.11	0.595	179.4	0.2780	14.99	0.590	176.3	0.2733	4/0
250	13.21	0.520	18.16	0.715	259.0	0.4015	18.42	0.725	266.3	0.4128	17.02	0.670	227.4	0.3525	16.76	0.660	220.7	0.3421	250
300	14.48	0.570	19.43	0.765	296.5	0.4596	19.69	0.775	304.3	0.4717	18.29	0.720	262.6	0.4071	18.16	0.715	259.0	0.4015	300
350	15.65	0.616	20.57	0.810	332.3	0.5153	20.83	0.820	340.7	0.5281	19.56	0.770	300.4	0.4656	19.30	0.760	292.6	0.4536	350
400	16.74	0.659	21.72	0.855	370.5	0.5741	21.97	0.865	379.1	0.5876	20.70	0.815	336.5	0.5216	20.32	0.800	324.3	0.5026	400
500	18.69	0.736	23.62	0.930	438.2	0.6793	23.88	0.940	447.7	0.6939	22.48	0.885	396.8	0.6151	22.35	0.880	392.4	0.6082	500
600	20.65	0.813	26.29	1.035	542.8	0.8413	26.67	1.050	558.6	0.8659	25.02	0.985	491.6	0.7620	24.89	0.980	486.6	0.7542	600
700	22.28	0.877	27.94	1.100	613.1	0.9503	28.19	1.110	624.3	0.9676	26.67	1.050	558.6	0.8659	26.67	1.050	558.6	0.8659	700
750	23.06	0.908	28.83	1.135	652.8	1.0118	29.21	1.150	670.1	1.0386	27.31	1.075	585.5	0.9076	27.69	1.090	602.0	0.9331	750
900	25.37	0.999	31.50	1.240	779.3	1.2076	31.09	1.224	759.1	1.1766	30.33	1.194	722.5	1.1196	29.69	1.169	692.3	1.0733	900
1000	26.92	1.060	32.64	1.285	836.6	1.2968	32.64	1.285	836.6	1.2968	31.88	1.255	798.1	1.2370	31.24	1.230	766.6	1.1882	1000

*Dimensions are from industry sources.

**Types RHH and RHW without outer coverings.

Table 8 Conductor Properties

Size

Conductors Direct-Current Resistance at 75°C (167°F) Stranding Overall Copper

Area Diameter Diameter Area Uncoated Coated Aluminum

(AWG

or Circular

ohm/

kcmil)	mm2	mils	Quantity	mm	in.	mm	in.	mm2	in.2	km	kFT	km	kFT	km	kFT
18	0.823	1620	1	—	—	1.02	0.040	0.823	0.001	25.5	7.77	26.5	8.08	42.0	12.8
18	0.823	1620	7	0.39	0.015	1.16	0.046	1.06	0.002	26.1	7.95	27.7	8.45	42.8	13.1
16	1.31	2580	1	—	—	1.29	0.051	1.31	0.002	16.0	4.89	16.7	5.08	26.4	8.05
16	1.31	2580	7	0.49	0.019	1.46	0.058	1.68	0.003	16.4	4.99	17.3	5.29	26.9	8.21
14	2.08	4110	1	—	—	1.63	0.064	2.08	0.003	10.1	3.07	10.4	3.19	16.6	5.06
14	2.08	4110	7	0.62	0.024	1.85	0.073	2.68	0.004	10.3	3.14	10.7	3.26	16.9	5.17
12	3.31	6530	1	—	—	2.05	0.081	3.31	0.005	6.34	1.93	6.57	2.01	10.45	3.18
12	3.31	6530	7	0.78	0.030	2.32	0.092	4.25	0.006	6.50	1.98	6.73	2.05	10.69	3.25
10	5.261	10380	1	—	—	2.588	0.102	5.26	0.008	3.984	1.21	4.148	1.26	6.561	2.00
10	5.261	10380	7	0.98	0.038	2.95	0.116	6.76	0.011	4.070	1.24	4.226	1.29	6.679	2.04
8	8.367	16510	1	—	—	3.264	0.128	8.37	0.013	2.506	0.764	2.579	0.786	4.125	1.26
8	8.367	16510	7	1.23	0.049	3.71	0.146	10.76	0.017	2.551	0.778	2.653	0.809	4.204	1.28
6	13.30	26240	7	1.56	0.061	4.67	0.184	17.09	0.027	1.608	0.491	1.671	0.510	2.652	0.808
4	21.15	41740	7	1.96	0.077	5.89	0.232	27.19	0.042	1.010	0.308	1.053	0.321	1.666	0.508
3	26.67	52620	7	2.20	0.087	6.60	0.260	34.28	0.053	0.802	0.245	0.833	0.254	1.320	0.403
2	33.62	66360	7	2.47	0.097	7.42	0.292	43.23	0.067	0.634	0.194	0.661	0.201	1.045	0.319
1	42.41	83690	19	1.69	0.066	8.43	0.332	55.80	0.087	0.505	0.154	0.524	0.160	0.829	0.253
1/0	53.49	105600	19	1.89	0.074	9.45	0.372	70.41	0.109	0.399	0.122	0.415	0.127	0.660	0.201
2/0	67.43	133100	19	2.13	0.084	10.62	0.418	88.74	0.137	0.3170	0.0967	0.329	0.101	0.523	0.159
3/0	85.01	167800	19	2.39	0.094	11.94	0.470	111.9	0.173	0.2512	0.0766	0.2610	0.0797	0.413	0.126
4/0	107.2	211600	19	2.68	0.106	13.41	0.528	141.1	0.219	0.1996	0.0608	0.2050	0.0626	0.328	0.100
250	127	—	37	2.09	0.082	14.61	0.575	168	0.260	0.1687	0.0515	0.1753	0.0535	0.2778	0.0847
300	152	—	37	2.29	0.090	16.00	0.630	201	0.312	0.1409	0.0429	0.1463	0.0446	0.2318	0.0707
350	177	—	37	2.47	0.097	17.30	0.681	235	0.364	0.1205	0.0367	0.1252	0.0382	0.1984	0.0605
400	203	—	37	2.64	0.104	18.49	0.728	268	0.416	0.1053	0.0321	0.1084	0.0331	0.1737	0.0529
500	253	—	37	2.95	0.116	20.65	0.813	336	0.519	0.0845	0.0258	0.0869	0.0265	0.1391	0.0424
600	304	—	61	2.52	0.099	22.68	0.893	404	0.626	0.0704	0.0214	0.0732	0.0223	0.1159	0.0353
700	355	—	61	2.72	0.107	24.49	0.964	471	0.730	0.0603	0.0184	0.0622	0.0189	0.0994	0.0303
750	380	—	61	2.82	0.111	25.35	0.998	505	0.782	0.0563	0.0171	0.0579	0.0176	0.0927	0.0282
800	405	—	61	2.91	0.114	26.16	1.030	538	0.834	0.0528	0.0161	0.0544	0.0166	0.0868	0.0265
900	456	—	61	3.09	0.122	27.79	1.094	606	0.940	0.0470	0.0143	0.0481	0.0147	0.0770	0.0235
1000	507	—	61	3.25	0.128	29.26	1.152	673	1.042	0.0423	0.0129	0.0434	0.0132	0.0695	0.0212
1250	633	—	91	2.98	0.117	32.74	1.289	842	1.305	0.0338	0.0103	0.0347	0.0106	0.0554	0.0169
1500	760	—	91	3.26	0.128	35.86	1.412	1011	1.566	0.02814	0.00858	0.02814	0.00883	0.0464	0.0141
1750	887	—	127	2.98	0.117	38.76	1.526	1180	1.829	0.02410	0.00735	0.02410	0.00756	0.0397	0.0121
2000	1013	—	127	3.19	0.126	41.45	1.632	1349	2.092	0.02109	0.00643	0.02109	0.00662	0.0348	0.0106

Notes:

These resistance values are valid only for the parameters as given. Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance.
Equation for temperature change: R 2 = R 1 [1 + α (T 2 – 75)], where α cu = 0.00323, αAL = 0.00330 at 75°C.
Conductors with compact and compressed stranding have about 9 percent and 3 percent, respectively, smaller bare conductor diameters than those shown. See Table 5A for actual compact cable dimensions.
The IACS conductivities used: bare copper = 100%, aluminum = 61%.
Class B stranding is listed as well as solid for some sizes. Its overall diameter and area are those of its circumscribing circle. Informational Note: The construction information is in accordance with NEMA WC/70-2009 or ANSI/UL 1581-2011.

The resistance is calculated in accordance with National Bureau of Standards Handbook 100, dated 1966, and Handbook 109, dated 1972.

Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) — Three Single Conductors in Conduit

Size (AWGor kcmil)	Ohms to Neutral per Kilometer Ohms to Neutral per 1000 Feet	Size (AWGor kcmil)
XL (Reactance) for All Wires	Alternating-Current Resistance for Uncoated Copper Wires	Alternating-Current Resistance for Aluminum Wires	Effective Z at 0.85 PF for Uncoated CopperWires	Effective Z at 0.85 PF for AluminumWires
PVC,Aluminum Conduits	Steel Conduit	PVCConduit	Aluminum Conduit	Steel Conduit	PVCConduit	Aluminum Conduit	Steel Conduit	PVCConduit	Aluminum Conduit	Steel Conduit	PVCConduit	Aluminum Conduit	Steel Conduit
14	0.1900.058	0.2400.073	10.23.1	10.23.1	10.23.1	——	——	——	8.92.7	8.92.7	8.92.7	——	——	——	14
12	0.1770.054	0.2230.068	6.62.0	6.62.0	6.62.0	10.53.2	10.53.2	10.53.2	5.61.7	5.61.7	5.61.7	9.22.8	9.22.8	9.22.8	12
10	0.1640.050	0.2070.063	3.91.2	3.91.2	3.91.2	6.62.0	6.62.0	6.62.0	3.61.1	3.61.1	3.61.1	5.91.8	5.91.8	5.91.8	10
8	0.1710.052	0.2130.065	2.560.78	2.560.78	2.560.78	4.31.3	4.31.3	4.31.3	2.260.69	2.260.69	2.300.70	3.61.1	3.61.1	3.61.1	8
6	0.1670.051	0.2100.064	1.610.49	1.610.49	1.610.49	2.660.81	2.660.81	2.660.81	1.440.44	1.480.45	1.480.45	2.330.71	2.360.72	2.360.72	6
4	0.1570.048	0.1970.060	1.020.31	1.020.31	1.020.31	1.670.51	1.670.51	1.670.51	0.950.29	0.950.29	0.980.30	1.510.46	1.510.46	1.510.46	4
3	0.1540.047	0.1940.059	0.820.25	0.820.25	0.820.25	1.310.40	1.350.41	1.310.40	0.750.23	0.790.24	0.790.24	1.210.37	1.210.37	1.210.37	3
2	0.1480.045	0.1870.057	0.620.19	0.660.20	0.660.20	1.050.32	1.050.32	1.050.32	0.620.19	0.620.19	0.660.20	0.980.30	0.980.30	0.980.30	2
1	0.1510.046	0.1870.057	0.490.15	0.520.16	0.520.16	0.820.25	0.850.26	0.820.25	0.520.16	0.520.16	0.520.16	0.790.24	0.790.24	0.820.25	1
1/0	0.1440.044	0.1800.055	0.390.12	0.430.13	0.390.12	0.660.20	0.690.21	0.660.20	0.430.13	0.430.13	0.430.13	0.620.19	0.660.20	0.660.20	1/0
2/0	0.1410.043	0.1770.054	0.330.10	0.330.10	0.330.10	0.520.16	0.520.16	0.520.16	0.360.11	0.360.11	0.360.11	0.520.16	0.520.16	0.520.16	2/0
3/0	0.1380.042	0.1710.052	0.2530.077	0.2690.082	0.2590.079	0.430.13	0.430.13	0.430.13	0.2890.088	0.3020.092	0.3080.094	0.430.13	0.430.13	0.460.14	3/0
4/0	0.1350.041	0.1670.051	0.2030.062	0.2200.067	0.2070.063	0.330.10	0.360.11	0.330.10	0.2430.074	0.2560.078	0.2620.080	0.360.11	0.360.11	0.360.11	4/0
250	0.1350.041	0.1710.052	0.1710.052	0.1870.057	0.1770.054	0.2790.085	0.2950.090	0.2820.086	0.2170.066	0.2300.070	0.2400.073	0.3080.094	0.3220.098	0.330.10	250
300	0.1350.041	0.1670.051	0.1440.044	0.1610.049	0.1480.045	0.2330.071	0.2490.076	0.2360.072	0.1940.059	0.2070.063	0.2130.065	0.2690.082	0.2820.086	0.2890.088	300
350	0.1310.040	0.1640.050	0.1250.038	0.1410.043	0.1280.039	0.2000.061	0.2170.066	0.2070.063	0.1740.053	0.1900.058	0.1970.060	0.2400.073	0.2530.077	0.2620.080	350
400	0.1310.040	0.1610.049	0.1080.033	0.1250.038	0.1150.035	0.1770.054	0.1940.059	0.1800.055	0.1610.049	0.1740.053	0.1840.056	0.2170.066	0.2330.071	0.2400.073	400
500	0.1280.039	0.1570.048	0.0890.027	0.1050.032	0.0950.029	0.1410.043	0.1570.048	0.1480.045	0.1410.043	0.1570.048	0.1640.050	0.1870.057	0.2000.061	0.2100.064	500
600	0.1280.039	0.1570.048	0.0750.023	0.0920.028	0.0820.025	0.1180.036	0.1350.041	0.1250.038	0.1310.040	0.1440.044	0.1540.047	0.1670.051	0.1800.055	0.1900.058	600
750	0.1250.038	0.1570.048	0.0620.019	0.0790.024	0.0690.021	0.0950.029	0.1120.034	0.1020.031	0.1180.036	0.1310.040	0.1410.043	0.1480.045	0.1610.049	0.1710.052	750
1000	0.1210.037	0.1510.046	0.0490.015	0.0620.019	0.0590.018	0.0750.023	0.0890.027	0.0820.025	0.1050.032	0.1180.036	0.1310.040	0.1280.039	0.1380.042	0.1510.046	1000

Notes:

These values are based on the following constants: UL-Type RHH wires with Class B stranding, in cradled configuration. Wire conductivities are 100 percent IACS copper and 61 percent IACS aluminum, and aluminum conduit is 45 percent IACS. Capacitive reactance is ignored, since it is negli‐ gible at these voltages. These resistance values are valid only at 75°C (167°F) and for the parameters as given, but are representative for 600-volt wire types operating at 60 Hz.
Effective Z is defined as R cos(θ) + X sin(θ), where θ is the power factor angle of the circuit. Multiplying current by effective impedance gives a good

approximation for line-to-neutral voltage drop. Effective impedance values shown in this table are valid only at 0.85 power factor. For another circuit power factor (PF), effective impedance (Ze) can be calculated from R and X L values given in this table as follows: Ze = R × PF + X L sin[arccos(PF)].

Table 10 Conductor Stranding

Conductor Size	Number of Strands
Copper	Aluminum
AWG or kcmil	mm2	Class Ba	Class C	Class Ba
24–30	0.20–0.05	b	—	—
22	0.32	7	—	—
20	0.52	10	—	—
18	0.82	16	—	—
16	1.3	26	—	—
14–2	2.1–33.6	7	19	7c
1–4/0	42.4–107	19	37	19
250–500	127–253	37	61	37
600–1000	304–508	61	91	61
1250–1500	635–759	91	127	91
1750–2000	886–1016	127	271	127

aConductors with a lesser number of strands shall be permitted based on an evaluation for connectability and bending.

bNumber of strands vary.

cAluminum 14 AWG (2.1 mm2) is not available.

With the permission of Underwriters Laboratories, Inc., material is reproduced from UL Standard 486A-B, Wire Connectors, which is copyrighted by Underwriters Laboratories, Inc., Northbrook, Illinois. While use of this material has been authorized, UL shall not be responsible for the manner in which the information is presented, nor for any interpretations thereof. For more information on UL or to purchase standards, please visit our Stand‐ ards website at www.comm-2000.com or call 1-888-853-3503.

Table 11(A) and Table 11(B)

For listing purposes, Table 11(A) and Table 11(B) provide the required power source limitations for Class 2 and Class 3 power sources. Table 11(A) applies for alternating-current sources, and Table 11(B) applies for direct-current sources.

The power for Class 2 and Class 3 circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring a combination of power source and overcurrent protection. Power sources designed for interconnection shall be listed for the purpose.

As part of the listing, the Class 2 or Class 3 power source shall be durably marked where plainly visible to indicate the

class of supply and its electrical rating. A Class 2 power source not suitable for wet location use shall be so marked.

Exception: Limited power circuits used by listed information technology equipment.

Overcurrent devices, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangeable with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.

Table 11(A) Class 2 and Class 3 Alternating-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Class 2	Class 3	Class 2	Class 3
Source voltage V max (volts) (see Note 1)	0 through 20*	Over 20 and through 30*	Over 30 andthrough 150	Over 30 andthrough 100	0 through 20*	Over 20 and through 30*	Over 30 and through 100	Over 100 andthrough 150
Power limitationsVA max (volt-amperes) (see Note 1)	—	—	—	—	250 (seeNote 3)	250	250	N.A.
Current limitations I max (amperes) (see Note 1)	8.0	8.0	0.005	150/V max	1000/V max	1000/V max	1000/V max	1.0
Maximum overcurrent protection (amperes)	—	—	—	—	5.0	100/V max	100/V max	1.0
Power source maximum nameplate rating	VA (volt- amperes)	5.0 × V max	100	0.005 × V max	100	5.0 × V max	100	100	100
Current (amperes)	5.0	100/V max	0.005	100/V max	5.0	100/V max	100/V max	100/V max

Note: Notes for this table can be found following Table 11(B).

*Voltage ranges shown are for sinusoidal ac in indoor locations or where wet contact is not likely to occur. For nonsinusoidal or wet contact conditions, see Note 2.

Table 11(B) Class 2 and Class 3 Direct-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Class 2	Class 3	Class 2	Class 3
Source voltageV max (volts) (see Note 1)	0 through 20*	Over 20 and through 30*	Over 30 and through 60*	Over 60 and through 150	Over 60 and through 100	0 through 20*	Over 20 and through 60*	Over 60 and through 100	Over 100 and through 150
Power limitationsVA max (volt-amperes) (see Note 1)	—	—	—	—	—	250 (seeNote 3)	250	250	N.A.
Current limitations I max (amperes) (see Note 1)	8.0	8.0	150/V max	0.005	150/V max	1000/V max	1000/V max	1000/V max	1.0
Maximum overcurrent protection (amperes)	—	—	—	—	—	5.0	100/V max	100/V max	1.0
Power source maximum nameplate rating	VA (volt- amperes)	5.0 × V max	100	100	0.005× V max	100	5.0 × V max	100	100	100
Current (amperes)	5.0	100/V max	100/V max	0.005	100/V max	5.0	100/V max	100/V max	100/V max

*Voltage ranges shown are for continuous dc in indoor locations or where wet contact is not likely to occur. For interrupted dc or wet contact conditions, see Note 4.

Notes for Table 11(A) and Table 11(B)

V max, I max, and VA max are determined with the current-limiting impedance in the circuit (not bypassed) as follows:V max: Maximum output voltage regardless of load with rated input applied.I max: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, I max limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, or as part of a listed product, is used in combination with a nonpower-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, I maxlimits apply after 5 seconds.VA max: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used.
For nonsinusoidal ac, V max shall not be greater than 42.4 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used or V max shall not be greater than 15 volts for sinusoidal ac and 21.2 volts peak for nonsinusoidal ac.
If the power source is a transformer, VA max is 350 or less when V max is 15 or less.
For dc interrupted at a rate of 10 to 200 Hz, V max shall not be greater than 24.8 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used, or V max shall not be greater than 30 volts for continuous dc; 12.4 volts peak for dc that is interrupted at a rate of 10 to 200 Hz.
Table 12(A) and Table 12(B)For listing purposes, Table 12(A) and Table 12(B) provide the required power source limitations for power-limited fire alarm sources. Table 12(A) applies for alternating-current sour‐ ces, and Table 12(B) applies for direct-current sources. The power for power-limited fire alarm circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring the power to be limited by a combination of power source and overcurrent protection.Table 12(A) PLFA Alternating-Current Power Source LimitationsAs part of the listing, the PLFA power source shall be durably marked where plainly visible to indicate that it is a power- limited fire alarm power source. The overcurrent device, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangea‐ ble with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.

Power SourceInherently Limited Power Source (Overcurrent Protection Not Required)Not Inherently Limited Power Source (Overcurrent Protection Required)Circuit voltage V max(volts) (see Note 1)0 through 20Over 20 andthrough 30Over 30 andthrough 1000 through 20Over 20 andthrough 100Over 100 andthrough 150Power limitationsVA max(volt-amperes) (see Note 1)———250 (see Note 2)250N.A.Current limitationsI max (amperes) (see Note 1)8.08.0150/V max1000/V max1000/V max1.0Maximum overcurrent protection (amperes)———5.0100/V max1.0Power source maximum nameplate ratingsVA (volt-amperes)5.0 × V max1001005.0 × V max100100Current (amperes)5.0100/V max100/V max5.0100/V max100/V maxNote: Notes for this table can be found following Table 12(B).
Table 12(B) PLFA Direct-Current Power Source Limitations

Power SourceInherently Limited Power Source (Overcurrent Protection Not Required)Not Inherently Limited Power Source (Overcurrent Protection Required)Circuit voltage V max (volts) (see Note 1)0 through 20Over 20 andthrough 30Over 30 andthrough 1000 through 20Over 20 andthrough 100Over 100 andthrough 150Power limitations VA max (volt-amperes) (see Note 1)———250 (see Note 2)250N.A.Current limitations I max (amperes) (see Note 1)8.08.0150/V max1000/V max1000/V max1.0Maximum overcurrent protection (amperes)———5.0100/V max1.0Power source maximum nameplate ratingsVA (volt- amperes)5.0 × V max1001005.0 × V max100100Current (amperes)5.0100/V max100/V max5.0100/V max100/V maxNotes for Table 12(A) and Table 12(B)
1. V max, I max, and VA max are determined as follows:V max: Maximum output voltage regardless of load with rated input applied.I max: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, I max limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, is used in combination with a nonpower-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, I max limits apply after 5 seconds.VA max: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used. Current limiting impedance shall not be bypassed when determining I max and VA max.
2. If the power source is a transformer, VA max is 350 or less when V max is 15 or less.

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