Hendrix
Senior Member
- Location
- New England
Can a three wire be run to a disco for a 240vac AC unit and the receptacle requirement within 25' taken off of one leg?
AC disco
- Thread starter Hendrix
- Start date
- Status
rcarroll
Senior Member
- Location
- Fort Collins, Colorado
Yes, provided the outlet is tapped on the line side of disconnect & correct overcurrent protection for the conductor to the outlet.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Where is your neutral and what OCPD protects the tap and receptacle? Tapping a 3 wire 30A 240V resi disco to a 15A 120V receptacle is a no no.
I am assuming you mean 3 wire was 2H+1G, no noodle.
I am assuming you mean 3 wire was 2H+1G, no noodle.
Last edited:
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Yes, and no.
If you are supplying a 240 volt A/C unit and a 120 volt receptacle you will need separate neutral and equipment ground in the supply.
If the overcurrent protection is 15 or 20 amps that may be all you need, if overcurrent protection is over 20 amps you will need to include 15 or 20 amp overcurrent protection for the required receptacle portion of this at the very least, some will say you need to treat this supply as a feeder and provide separate overcurrent devices for the A/C as well as for the receptacle.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Why would you need a separate egc? I am not sure you meant to say that.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I would also look at 210.23(A)(2)
jaylectricity
Senior Member
- Location
- Massachusetts
- Occupation
- licensed journeyman electrician
I think he means separate from a neutral. So 3 current carrying conductors and an egc.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
From what is said in OP he has 240 volt AC and a three wire (cable) and wants to also supply a 120 volt receptacle, how does he get a neutral for the receptacle in a proper way with only a three wire cable?
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
We are all saying the same thing here, just different ways:
2H+1G=no.
2H+1N+1G=yes, assuming proper sizing and OCPDs are provided.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
I think Dennis was just asking why a separate EGC, not the neutral. He knows you need the neutral. Just my take on it.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Maybe I need to clarify what I said. When I used the word separate I meant separate neutral and equipment grounding conductor not two different equipment grounding conductors.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I knew what you meant earlier.
- Location
- Tennessee NEC:2017
- Occupation
- Semi-Retired Electrician
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
renosteinke
Senior Member
- Location
- NE Arkansas
I once thought this application over, and the solution is .... ELIMINATE the disconnect. Well, sort of.
Instead, spend just about the same amount of money on a 4-space panel. Use the breaker in this panel as the disconnect for the HVAC, and use another space to feed the receptacle.
No double-lugging, no shortage of wire space, no question of what to do with the neutral.
You still need a 4-wire feed, though.
Instead, spend just about the same amount of money on a 4-space panel. Use the breaker in this panel as the disconnect for the HVAC, and use another space to feed the receptacle.
No double-lugging, no shortage of wire space, no question of what to do with the neutral.
You still need a 4-wire feed, though.
- Status