Article 605 Office Furnishings Question

[luckyshadow]

Ok-
A few of us are debating Article 605.6.
Basically 605.6 says that multiwire branch circuits feeding partitions shall be provided with a means to simultaneously disconnecting all ungrounded conductors at the panelboard.

Now most systems furniture comes wired with 4 circuits, and the whip has 4 hot conductors and 2 neutral conductors.

Some folks are arguing that the electrician must use a 4 pole breaker or provide handle ties to disconnect all 4 circuits based on 605.6

I say that the electrician can use a 3 pole breaker ( or approved handle ties) and a single pole breaker.

I base this on article 100, the definition of a multiwire circuit is :
Branch circuit,Multiwire:
A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system

I based my opinion on the part of the definition that says " two or more ungrounded conductors that have a voltage between them"
A 4wire "circuit" will not have voltage between ALL 4 ungrounded conductors.

Thoughts and opinions welcomed !

 

[iwire]

You are 100% correct

There is no requirement to simultaneously disconnect all circuits, just each MWBC.

 

[augie47]

and Bob, as usual, is 100% correct

 

[Jim W in Tampa]

I agree too. For one thing 3 of them share 1 nuetral and the 4 th is usually for isolated ground. So it is not a mwbc

As to the other 3 it does not matter now as all mwbc require handle tie

 

[brother]

Just make sure that j box where the whip ties into is 'acessible' . LOL sorry yall I couldn't resist.