Energy Management Systems

  1. Scope. This article applies to the installation and opera‐ tion of energy management systems.Informational Note: Performance provisions in other codes establish prescriptive requirements that may further restrict the requirements contained in this article.
  2. Definitions. For the purpose of this article, the follow‐ ing definitions shall apply.

Control. The predetermined process of connecting, discon‐ necting, increasing, or reducing electric power.

Energy Management System. A system consisting of any of the following: a monitor(s), communications equipment, a control‐ ler(s), a timer(s), or other device(s) that monitors and /or controls an electrical load or a power production or storage source.

Monitor. An electrical or electronic means to observe, record, or detect the operation or condition of the electric power system or apparatus.

750.20 Alternate Power Sources. An energy management system shall not override any control necessary to ensure continuity of an alternate power source for the following:

  1. Fire pumps
  2. Health care facilities
  3. Emergency systems
  4. Legally required standby systems
  5. Critical operations power systems

750.30 Load Management. Energy management systems shall be permitted to monitor and control electrical loads unless restricted in accordance with 750.30(A) through (C).

  1. Load Shedding Controls. An energy management system shall not override the load shedding controls put in place to ensure the minimum electrical capacity for the following:
    1. Fire pumps
    2. Emergency systems
    3. Legally required standby systems
    4. Critical operations power systems
  2. Disconnection of Power. An energy management system shall not be permitted to cause disconnection of power to the following:
    1. Elevators, escalators, moving walks, or stairway lift chairs
    2. Positive mechanical ventilation for hazardous (classified) locations
    3. Ventilation used to exhaust hazardous gas or reclassify an area
    4. Circuits supplying emergency lighting
    5. Essential electrical systems in health care facilities
  3. Capacity of Branch Circuit, Feeder, or Service. An energy management system shall not cause a branch circuit, feeder, or service to be overloaded at any time.

750.50 Field Markings. Where an energy management system is employed to control electrical power through the use of a remote means, a directory identifying the controlled device(s) and circuit(s) shall be posted on the enclosure of the control‐ ler, disconnect, or branch-circuit overcurrent device.

Informational Note: The use of the term remote is intended to convey that a controller can be operated via another means or location through communications without a direct operator interface with the controlled device.

Informational Note No. 2: Class 1, 2, and 3 circuits are defined

in Article 725.

  1. Definitions.Abandoned Fire Alarm Cable. Installed fire alarm cable that is not terminated at equipment other than a connector and not identified for future use with a tag.Fire Alarm Circuit. The portion of the wiring system between the load side of the overcurrent device or the power-limited supply and the connected equipment of all circuits powered and controlled by the fire alarm system. Fire alarm circuits are classified as either non–power-limited or power-limited.Fire Alarm Circuit Integrity (CI) Cable. Cable used in fire alarm systems to ensure continued operation of critical circuits during a specified time under fire conditions.Non–Power-Limited Fire Alarm Circuit (NPLFA). A fire alarm circuit powered by a source that complies with 760.41 and 760.43.Power-Limited Fire Alarm Circuit (PLFA). A fire alarm circuit powered by a source that complies with 760.121.
  2. Other Articles. Circuits and equipment shall comply with 760.3(A) through (M). Only those sections of Article 300 referenced in this article shall apply to fire alarm systems.
  1. Spread of Fire or Products of Combustion. See 300.21.
  2. Ducts, Plenums, and Other Air-Handling Spaces. Power- limited and non-power-limited fire alarm cables installed in ducts, plenums, or other spaces used for environmental air shall comply with 300.22.imageException No. 2: Power-limited fire alarm cables selected in accordancewith Table 760.154 and installed in accordance with 760.135(C) shall be permitted to be installed in other spaces used for environmental air (plenums).Exception No. 1: Power-limited fire alarm cables selected in accordance with Table 760.154 and installed in accordance with 760.135(B) and 300.22(B), Exception shall be permitted to be installed in ducts specifi‐ cally fabricated for environmental air.