1.) Comment on Proposal No.: 2-13Add new exception to 210.4(B):
Exception: Where a multiwire branch circuit with line to neutral loads must be used at a separate structure in order to comply with 225.30, and an alarm circuit is required for its safe operation is part of this multiwire branch circuit.
2.) Recommendation: Accept the proposal in part as follows:
Exception: Simultaneous disconnection of ungrounded conductors of a dedicated multiwire branch circuit supplying a combination pump controller and alarm may be omitted if all supply conductors are contained within the same wiring method at the controller. A warning label shall be placed on the panelboard that clearly states that both circuits supplying the pump and alarm require disconnection prior to maintenance or repair.
3.) Substantiation: A pump controller featuring a 120V pump on the first line and a 120V alarm on the second line of a multiwire branch circuit with no stops in between should not pose a surprise to qualified personnel if all conductors are present and terminate within the same enclosure. A pump that trips the OCPD and inadvertently also trips the supply to the alarm defeats the entire purpose of having the alarm. The label was added as an afterthought to sweeten the deal.