30 amp circuit


Old 09-16-04, 08:51 AM
Visiting Guest
Posts: n/a
30 amp circuit

Good day, I am in the need of a 30 amp 115V circuit on the oppisite end of my house from the breaker box. I have a 50 amp 220V at the location but I didnt know if there was a way to drop one leg of the 220 or if I should run a complete new circuit. The 220 is used very seldom for a arc welder, and the 110 would be used to power a travel trailer (air conitioner ). I would not be useing both outlets at the same time. If I need to run a new circuit, It would be approx 100' from the breaker box would a 10/3 be larg enough?
Sponsored Links
Old 09-16-04, 08:57 AM
dougm's Avatar
Join Date: Sep 2003
Location: The Colony, Texas
Posts: 917
Using the 50 amp wiring, you could _probably_ install a sub panel with a 220V circuit for the arc welder and a 120V circuit for the travel trailer. Is the existing wire 3 conductor or 4?

Doug M.
Old 09-16-04, 09:04 AM
Join Date: Sep 2000
Location: United States
Posts: 18,497
The 50-amp 240-volt circuit for the welder probably has no neutral. This is the kiss of death to your plan. Doug's question offers you the only glimmer of hope.

A 120-volt 30-amp circuit over 100 feet of #10 is safe, but the voltage drop will be hard on your air conditioner. I'd upgrade to #8. The good news is that you don't need 8/3; 8/2 is good enough.
Old 09-16-04, 09:05 AM
Visiting Guest
Posts: n/a
You cannot take one phase of the 240V 50A circuit and use it for a 120V 30A circuit since that 120V circuit would be protected at 50A. A subpanel is a possibility as long as you have 4 wires running to the arc welder. If you run a new circuit with 10/3 (why not use 10/2?), and you are going to need anything over 15A for the circuit, you will be above 3% on voltage drop.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes