Branch-circuit Distribution Equipment

[infinity]

210.5(C)(1) mentions branch-circuit distribution equipment and panelboards. Since it's differentiated from a panelboard one could assume that it is not a panelboard. Also Branch-circuit distribution equipment is not defined in the NEC so what it is? Would it be something like a PDU?

210.5(C)(1) Branch Circuits Supplied from More Than One Nominal Voltage System.
Where the premises wiring system has branch circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch circuit shall be identified by phase or line and by system voltage class at all termination, connection, and splice points in compliance with 210.5(C)(1)(a) and (b). Different systems within the same premises that have the same system voltage class shall be permitted to use the same identification.
(a)Means of Identification. The means of identification shall be permitted to be by separate color coding, marking tape, tagging, or other approved means.
(b)Posting of Identification Means. The method utilized for conductors originating within each branch-circuit panelboard or similar branch-circuit distribution equipment shall be documented in a manner that is readily available or shall be permanently posted at each branch-circuit panelboard or similar branch-circuit distribution equipment. The label shall be of sufficient durability to withstand the environment involved and shall not be handwritten.

 

[Tyler C]

I think the code is recognizing that not all branch circuits originate in panelboards, but it would still like the 210.5(C)(1) requirements to apply. Could be a switchboard, or a fused disconnect.

Similar language for feeders exists in 215.12(C)(1).

 

[Dennis Alwon]

To me, it seems to be semantics. A panelboard is defined so Imo, the distribution equipment is a panel that distributes power to other panels or transformers. Now if you install a heating system in the distribution panel does that make it a panelboard?

A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet, enclosure, or cutout box placed in or against a wall, partition, or other support; and accessible only from the front. (CMP-9)

 

[jim dungar]

Might it relate to the difference between the use of branch circuit protective devices listed to UL489, and supplemental devices listed to UL1077 Orion listed at all. Non listed supplemental devices in a panel can only be fed by a branch circuit and not a feeder.