Disconnect of UNGROUDED conductor (NEUTRAL)

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The only thing I can think of is gas pumps. The breaker has an aux contact to disconnect the neutral at the same time as the hot, don't know if this is still code or not, don't have a recent code book in front of me. (too lazy to go out to the truck and get it)
 
230.70 General.
Means shall be provided to disconnect all conductors in a building or other structure from the service-entrance conductors.
On a grounded system one of the service entrance conductors is the grounded conductor and there must be a means of disconnect. However you are not required to provide a disconnect switch for the grounded conductor.
230.75 Disconnection of Grounded Conductor.
Where the service disconnecting means does not disconnect the grounded conductor from the premises wiring, other means shall be provided for this purpose in the service equipment. A terminal or bus to which all grounded conductors can be attached by means of pressure connectors shall be permitted for this purpose. In a multisection switchboard, disconnects for the grounded conductor shall be permitted to be in any section of the switchboard, provided any such switchboard section is marked.
 
brother said:
Is there a requirement to disconnect all the conductors including the neutral conductor to a trailer, mobile home etc?? Ive searched the code but couldnt find any.

Look at 225.38(B)(C)

(B) Simultaneous Opening of Poles. Each building or structure disconnecting means shall simultaneously disconnect all ungrounded supply conductors that it controls from the building or structure wiring system.

(C) Disconnection of Grounded Conductor. Where the building or structure disconnecting means does not disconnect the grounded conductor from the grounded conductors in the building or structure wiring, other means shall be provided for this purpose at the location of disconnecting means. A terminal or bus to which all grounded conductors can be attached by means of pressure connectors shall be permitted for this purpose.
Rick
 
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