Q. about fused disconnect for a 110 VAC electrical enclosure

[fncruz]

I do electrical enclosures powered by single phase 110 VAC. I usually have a 30 or 40 Amp Circuit breaker for incoming power which has been okay for customers. A new customer says they want a fused disconnect.

Even though I am only using it for 110 VAC should I get a 3 pole disconnect and use the other poles for neutral and ground?

Or do people do it differently?

Thanks!

 

[CoolWill]

You can't fuse the neutral and ground. Square D makes a 1-pole fused disconnect, the L111 rated at 30 amps 120 volts. Otherwise you would need a 2-pole disconnect and just use one pole.

 

[fncruz]

Ok Thanks!

 

[Jraef]

Yeah, nobody cares if you only use one pole of a disconnect. Just as CoolWill says, no fusing on the neutral. You can BREAK the neutral as long as you ALSO break the hot at the same time, but no fusing.

 

[kwired]

You can BREAK the neutral as long as you ALSO break the hot at the same time, but no fusing.

And you almost never can break the equipment ground other than with plug/receptacle situations.