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Article 522

Control Systems for Permanent Amusement Attractions

Part I. General

  1. Scope. This article covers the installation of control circuit power sources and control circuit conductors for electri‐ cal equipment, including associated control wiring in or on all structures, that are an integral part of a permanent amusement attraction.
  2. Definitions.

Entertainment Device. A mechanical or electromechanical device that provides an entertainment experience.

522.5 ARTICLE 522 — CONTROL SYSTEMS FOR PERMANENT AMUSEMENT ATTRACTIONS

Informational Note: These devices may include animated props, show action equipment, animated figures, and special effects, coordinated with audio and lighting to provide an entertain‐ ment experience.

Permanent Amusement Attraction. Ride devices, entertain‐ ment devices, or combination thereof, that are installed so that portability or relocation is impracticable.

Ride Device. A device or combination of devices that carry, convey, or direct a person(s) over or through a fixed or restric‐ ted course within a defined area for the primary purpose of amusement or entertainment.

522.5 Voltage Limitations. Control voltage shall be a maxi‐ mum of 150 volts, nominal, ac to ground or 300 volts dc to ground.

522.7 Maintenance. The conditions of maintenance and supervision shall ensure that only qualified persons service the permanent amusement attraction.

Part II. Control Circuits

522.10 Power Sources for Control Circuits.

  1. Power-Limited Control Circuits. Power-limited control circuits shall be supplied from a source that has a rated output of not more than 30 volts and 1000 volt-amperes.
    1. Control Transformers. Transformers used to supply power-limited control circuits shall comply with the applicable sections within Parts I and II of Article 450.
    2. Other Power-Limited Control Power Sources. Power- limited control power sources, other than transformers, shall be protected by overcurrent devices rated at not more than 167 percent of the volt-ampere rating of the source divided by the rated voltage. The fusible overcurrent devices shall not be interchangeable with fusible overcurrent devices of higher ratings. The overcurrent device shall be permitted to be an integral part of the power source.

To comply with the 1000 volt-ampere limitation of 522.10(A), the maximum output of power sources, other than transformers, shall be limited to 2500 volt-amperes, and the product of the maximum current and maximum voltage shall not exceed 10,000 volt-amperes. These ratings shall be deter‐ mined with any overcurrent-protective device bypassed.

Part III. Control Circuit Wiring Methods

  1. Conductors, Busbars, and Slip Rings. Insulated control circuit conductors shall be copper and shall be permit‐ ted to be stranded or solid. Listed multiconductor cable assem‐ blies shall be permitted.Exception No. 1: Busbars and slip rings shall be permitted to be materi‐ als other than copper.Exception No. 2: Conductors used as specific-purpose devices, such as thermocouples and resistive thermal devices, shall be permitted to be materials other than copper.
  2. Conductor Sizing.
    1. Conductors Within a Listed Component or Assembly. Conductors of size 30 AWG or larger shall be permitted within a listed component or as part of the wiring of a listed assembly.
    2. Conductors Within an Enclosure or Operator Station. Conductors of size 30 AWG or larger shall be permitted in a listed and jacketed multiconductor cable within an enclosure or operator station. Conductors in a non-jacketed multiconduc‐ tor cable, such as ribbon cable, shall not be smaller than 26 AWG. Single conductors shall not be smaller than 24 AWG.Exception: Single conductors 30 AWG or larger shall be permitted for jumpers and special wiring applications.
    3. Conductors Outside of an Enclosure or Operator Station. The size of conductors in a listed and jacketed, multiconductor cable shall not be smaller than 26 AWG. Single conductors shall not be smaller than 18 AWG and shall be installed only where part of a recognized wiring method of Chapter 3.
  3. Conductor Ampacity. Conductors sized 16 AWG and smaller shall not exceed the continuous current values provi‐ ded in Table 522.22.
  4. Overcurrent Protection for Conductors. Conductors 30 AWG through 16 AWG shall have overcurrent protection in accordance with the appropriate conductor ampacity in Table522.22. Conductors larger than 16 AWG shall have overcurrent protection in accordance with the appropriate conductor ampacity in Table 310.15(B)(16).
    Table 522.22 Conductor Ampacity Based on Copper Conductors with 60°C and 75°C Insulation in an Ambient Temperature of 30°C(B) Non–Power-Limited Control Circuits. Non–power-limited                                                                                                                                control circuits shall not exceed 300 volts. The power output of the source shall not be required to be limited.
    Conductor SizeAmpacityimage
    1. Control Transformers. Transformers used to supply non– power-limited control circuits shall comply with the applicable sections within Parts I and II of Article 450.
    2. Other Non–Power-Limited Control Power Sources. Non– power-limited control power sources, other than transformers, shall be protected by overcurrent devices rated at not more than 125 percent of the volt-ampere rating of the source divi‐ ded by the rated voltage. The fusible overcurrent devices shall not be interchangeable with fusible overcurrent devices of higher ratings. The overcurrent device shall be permitted to be

    Notes:(AWG) 60°C 75°Cimage30 – 0.528 – 0.826 – 124 2 222 3 320 5 518 7 716 10 10an integral part of the power source.
    1. For ambient temperatures other than 30°C, use Table 310.15(B)(2)(a) temperature correction factors.
    2. Ampacity adjustment for conductors with 90°C or greater insulation shall be based on ampacities in the 75°C column.
    ARTICLE 525 — CARNIVALS, CIRCUSES, FAIRS, AND SIMILAR EVENTS 525.6
  5. Conductors of Different Circuits in the Same Cable, Cable Tray, Enclosure, or Raceway. Control circuits shall be permitted to be installed with other circuits as specified in 522.24(A) and (B).
    1. Two or More Control Circuits. Control circuits shall be permitted to occupy the same cable, cable tray, enclosure, or raceway without regard to whether the individual circuits are alternating current or direct current, provided all conductors are insulated for the maximum voltage of any conductor in the cable, cable tray, enclosure, or raceway.
    2. Control Circuits with Power Circuits. Control circuits shall be permitted to be installed with power conductors as specified in 522.24(B)(1) through (B)(3).
      1. In a Cable, Enclosure, or Raceway. Control circuits and power circuits shall be permitted to occupy the same cable, enclosure, or raceway only where the equipment powered is functionally associated.
      2. In Factory- or Field-Assembled Control Centers. Control circuits and power circuits shall be permitted to be installed in factory- or field-assembled control centers.
      3. In a Manhole. Control circuits and power circuits shall be permitted to be installed as underground conductors in a manhole in accordance with one of the following:
    1. The power or control circuit conductors are in a metal- enclosed cable or Type UF cable.
    2. The conductors are permanently separated from the power conductors by a continuous firmly fixed noncon‐ ductor, such as flexible tubing, in addition to the insula‐ tion on the wire.
    3. The conductors are permanently and effectively separa‐ ted from the power conductors and securely fastened to racks, insulators, or other approved supports.
    4. In cable trays, where the control circuit conductors and power conductors not functionally associated with them are separated by a solid fixed barrier of a material compatible with the cable tray, or where the power or control circuit conductors are in a metal-enclosed cable.
  6. Ungrounded Control Circuits. Separately derived ac circuits and systems 50 volts or greater and 2-wire dc circuits and systems 60 volts or greater shall be permitted to be ungrounded, provided that all the following conditions are met:
  1. Continuity of control power is required for orderly shut‐ down.
  2. Ground detectors are installed on the control system.

522.28 Control Circuits in Wet Locations. Where wet contact is likely to occur, ungrounded 2-wire direct-current control circuits shall be limited to 30 volts maximum for continuous dc or 12.4 volts peak for direct current that is interrupted at a rate of 10 to 200 Hz.

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