2 conductor romex OK for 240 VAC?

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Zee

Senior Member
Location
CA
Title say it all,
can I use 10-2 Romex for an Enphase branch circuit that is 240 VAC?

I see some installers using x-2 Romex for 240 VAC circuits that don't need a neutral. I don't think this is up to Code because you have to use the white conductor for a hot wire.
Will taping the white ends to red solve that?

So I run x-3 Romex and don't use the white. A bit of a waste.
 
J

JFletcher

Senior Member
Location
Williamsburg, VA
Zee said:
Title say it all,
can I use 10-2 Romex for an Enphase branch circuit that is 240 VAC?

I see some installers using x-2 Romex for 240 VAC circuits that don't need a neutral. I don't think this is up to Code because you have to use the white conductor for a hot wire.
Will taping the white ends to red solve that?

So I run x-3 Romex and don't use the white. A bit of a waste.
Click to expand...

Most water heaters in America are wired with 10 2. Take a sharpie and mark the white conductor black, voilà, no problem.
 
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GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
480sparky said:
What is an Enphase branch circuit?
Click to expand...
It is a circuit which supplies the AC side of one or more Enphase grid interactive microinverters. The Enphase-supplied cable which can be used to link the inverters is referred to as a trunk cable.

Sent from my XT1585 using Tapatalk
 
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JasonC

Member
Location
N. Andover MA
Be careful about not having a neutral in a Enphase system, Enphase uses the neutral to communicate data back to the Envoy as well as monitor the Line to Neutral voltage limits. Is it legal, I cant find in 705 where it says you can't. However it is not good practice, we want to make it difficult for homeowners and other electricians to tap into a Solar circuit, especially if there are financial incentives for power produced. You want the meter to record production only, you wouldn't want a load to reduce that number. If the circuit is in EMT or MC and labeled as recommended you would certainly ensure that someone doesn't "accidentally" tap off that branch circuit.
 
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