Different Voltages In Same Conduit

[mstrlucky74]

Can you have 120 and 277 wiring in same conduit?

 

[cowboyjwc]

Yes they just have to be different colors and one of the neutrals must be gray or white with corresponding colored stripes.

 

[LibertyEngineering]

Yes they just have to be different colors and one of the neutrals must be gray or white with corresponding colored stripes.

Also, All wiring insulation must be rated for the highest voltage running within the same raceway. So the insulation on the 120V wiring must be rated for 277V at a minimum.

 

[iwire]

I am afraid I am doing a double nit pick.

Yes they just have to be different colors and one of the neutrals must be gray or white with corresponding colored stripes.

They are required to be identified, color is one way to do it but not the only way required.

Also, All wiring insulation must be rated for the highest voltage running within the same raceway. So the insulation on the 120V wiring must be rated for 277V at a minimum.

What common wire are you getting for use in raceways that is not 600 volt rated?

 

[jumper]

I guess I will post the sections.

300.3(C) Conductors of Different Systems.
(1) 600 Volts, Nominal, or Less. Conductors of ac and dc
circuits, rated 600 volts, nominal, or less, shall be permitted
to occupy the same equipment wiring enclosure, cable, or
raceway. All conductors shall have an insulation rating
equal to at least the maximum circuit voltage applied to any
conductor within the enclosure, cable, or raceway.

Informational Note No. 1: See 725.136(A) for Class 2 and
Class 3 circuit conductors.

Informational Note No. 2: See 690.4(B) for photovoltaic
source and output circuits.

210.5 Identification for Branch Circuits.
(A) Grounded Conductor. The grounded conductor of a
branch circuit shall be identified in accordance with 200.6.

(B) Equipment Grounding Conductor. The equipment
grounding conductor shall be identified in accordance with
250.119.

(C) Identification of Ungrounded Conductors. Ungrounded
conductors shall be identified in accordance with
210.5(C)(1), (2), and (3).
(1) Application. Where the premises wiring system has
branch circuits supplied from more than one nominal voltage
system, each ungrounded conductor of a branch circuit
shall be identified by phase or line and system at all termination,
connection, and splice points.
(2) Means of Identification. The means of identification
shall be permitted to be by separate color coding, marking
tape, tagging, or other approved means.
(3) Posting of Identification Means. The method utilized
for conductors originating within each branch-circuit panelboard
or similar branch-circuit distribution equipment
shall be documented in a manner that is readily available or
shall be permanently posted at each branch-circuit panelboard
or similar branch-circuit distribution equipment.

 

[cowboyjwc]

I am afraid I am doing a double nit pick.



They are required to be identified, color is one way to do it but not the only way required.



What common wire are you getting for use in raceways that is not 600 volt rated?

Yeah, what Jumper said.

 

[jumper]

Yeah, what Jumper said.

Of course Jumper is notorious for not re-identifying his MC lighting whips when installing 277V fixtures in a mixed voltage building.:angel:

 

[cowboyjwc]

Of course Jumper is notorious for not re-identifying his MC lighting whips when installing 277V fixtures in a mixed voltage building.:angel:

Yeah, what Jumper knew in his heart to be right.:lol:

 

[LibertyEngineering]

I am afraid I am doing a double nit pick.



They are required to be identified, color is one way to do it but not the only way required.



What common wire are you getting for use in raceways that is not 600 volt rated?

I am not the one 'getting' the wire. Just stating the code facts in case someone else does.

 

[Dennis Alwon]

I am not the one 'getting' the wire. Just stating the code facts in case someone else does.

I think what Bob was saying is that our standard wiring is rated 600V so that issue of insulation rating is not relevant with these voltages

 

[LibertyEngineering]

I think what Bob was saying is that our standard wiring is rated 600V so that issue of insulation rating is not relevant with these voltages

Understood -I suppose I should have clarified why I indicated what I did. Lets say someone decided to pull a low voltage control wire in the same raceway as a line voltage circuit. For instance Outdoor generator block heater circuit @ 208V and generator remote annunciator panel controls or start circuit controls @ 24V. The insulation of the 24V wiring would need to be rated for 208V. Just stating code facts to cover all scenarios possible which was above and beyond the initial question asked. Apologies!!!

 

[Dennis Alwon]

Understood -I suppose I should have clarified why I indicated what I did. Lets say someone decided to pull a low voltage control wire in the same raceway as a line voltage circuit. For instance Outdoor generator block heater circuit @ 208V and generator remote annunciator panel controls or start circuit controls @ 24V. The insulation of the 24V wiring would need to be rated for 208V. Just stating code facts to cover all scenarios possible which was above and beyond the initial question asked. Apologies!!!

I have seen that done many times. In fact even if the conductor is the same voltage rating it may not be compliant--art 725.136(A)-- this is in response to the generator setup you mentioned