Switching lights

[mbrooke]

When switching 208 volt lighting, are you required to break both ungrounded conductors? Specs call for single pole 277 volt switches. These will not be a means of disconnect but rather a way for employees to turn lights off at the end of the day.

 

[dkidd]

410.141 Control.
(A) Disconnection. Luminaires or lamp installation shall
be controlled either singly or in groups by an externally
operable switch or circuit breaker that opens all ungrounded
primary conductors.

 

[mbrooke]

410.141 Control.
(A) Disconnection. Luminaires or lamp installation shall
be controlled either singly or in groups by an externally
operable switch or circuit breaker that opens all ungrounded
primary conductors.

So this means even non serviceable disconnecting means? Just making sure of intent.

 

[ActionDave]

So this means even non serviceable disconnecting means? Just making sure of intent.

I think the intent is just what it says. There are other exceptions in the code for controllers vs. disconnects but art. 410 makes no mention of them.

 

[mbrooke]

410.141 Control.
(A) Disconnection. Luminaires or lamp installation shall
be controlled either singly or in groups by an externally
operable switch or circuit breaker that opens all ungrounded
primary conductors.

I think the intent is just what it says. There are other exceptions in the code for controllers vs. disconnects but art. 410 makes no mention of them.

I checked and Im being told 410 only applies to systems over 1000 volts:

 

[iwire]

I checked and Im being told 410 only applies to systems over 1000 volts:

That is correct, however there is still this one.

410.104 Electric-Discharge Lamp Auxiliary Equipment.

(B) Switching. Where supplied by the ungrounded conductors
of a circuit, the switching device of auxiliary equipment
shall simultaneously disconnect all conductors.

Ballasts are electric-discharge lamp auxiliary equipment,

 

[mbrooke]

That is correct, however there is still this one.




Ballasts are electric-discharge lamp auxiliary equipment,

So the requirement is only for HID lighting?

 

[GoldDigger]

So the requirement is only for HID lighting?

Technically, fluorescent is also electric-discharge lighting. As is a neon sign.....

 

[mbrooke]

Technically, fluorescent is also electric-discharge lighting. As is a neon sign.....

But technically LED would be excluded?

 

[iwire]

So the requirement is only for HID lighting?

No

Technically, fluorescent is also electric-discharge lighting. As is a neon sign.....

Agreed

But technically LED would be excluded?

Yes, I believe so.

 

[mbrooke]

No



Agreed



Yes, I believe so.

Guess the EE is right then?