Although electrical power distribution systems are not specifically covered by the prescriptive requirements for alterations in Section 141.0(b), they are covered under the blanket requirement that:
The altered components of…any newly installed equipment serving the alteration, shall meet the applicable requirements of Sections 110.0 through 110.9, Sections 120.0 through 120.6, and Sections 120.8 through 139130.5
Only newly installed electrical power distribution equipment serving the area being altered is subject to the Standards. This means that if the equipment serves the altered area but is not located in the altered area, it must still comply. Any equipment that remains in place during the alteration, or is removed and reinstalled, is not subject to any of the requirements of the Standards.
In terms of the specific items of electrical equipment newly installed in an alteration project, the following requirements apply:
A. New electrical services, switchboards, panelboards, motor control centers, and subpanels
Each incoming electrical service must be fitted with a meter as set out in Section 130.5(a), if the service itself is new OR if an existing service supplies a new switchboard, panelboard or motor control center. Loads must be disaggregated into their separate load types as set out in Section 130.5(b) (see Section 8.1.2B above).
B. Feeders and Branch Circuits
New conductors must meet the voltage drop requirements set out in Section 130.5(c) of the Standards (see Section 8.1.2C above). Existing conductors are not subject to these requirements.
New conductors must also be disaggregated as set out in Section 130.5(b). This means that any circuit that has an overcurrent protection device rated at less than 60A must be supplied by a panelboard or subpanel that supplies only loads of that same type, as set out in Table 130.5-B of the Standards (shown in Table 8-1 of this chapter).
C. Receptacles
If new controlled receptacles are added, they must be equipped with automatic shut-off controls, and they must be permanently marked as being controllable. These requirements are set out in Sections 130.5(d)1 and 3.
If new uncontrolled receptacles are added, they are not subject to the requirements of Part 6 of the Standards.
D. Energy Management Control System (EMCSs)
Newly installed EMCS systems must comply with the requirements of Sections 110.9 and 130.4 (see Section 8.6 above) if they are installed to comply with mandatory controls requirements triggered by the alteration project, under Section 141.0(b)2 of the Standards.
If additional functionality is added to an existing EMCS system, this would not be subject to any of the requirements of the Standards, because it is not “newly installed equipment” per Section 141.0(b).