- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I want to make this exception proposal- please let me know what you think.
210.4(B) Disconnecting Means
(B) Disconnecting Means. Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates
Substantiation
210.4(B) Disconnecting Means
(B) Disconnecting Means. Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates
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.
Substantiation
The definition of structure is that which is built or constructed. A post in the ground would meet this definition. Since a post is often used to install the alarm box for septic pumps and sewer lift pumps it is not possible to wire them without violating one of 2 codes. As the code is now we can either run 2 individual branch circuits and violate 225.30 or we use a multi-wire branch circuit and violate 210.4.(B) or 240.15(B)(1). The Dp breaker or handle ties on a muti-wire branch circuit would turn the alarm circuit off if there were a fault in the pump circuit. This would defeat the purpose of 2 circuits. This exception would alleviate that problem.
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