DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (
-   Electrical (
-   -   120 v circuit from 230 volt panel (

mills372 09-06-2009 09:37 PM

120 v circuit from 230 volt panel
:help:I have an existing 230 volt exterior panel with black and white feeds to buss bars in the panel and double pole 30 amp breakers. A ground from the house panel is connected to the ground bar, but no neutral. The exterior panel feeds an irrigation relay and pump. The existing panel is fed from a 30 amp double pole breaker located in the main panel in the house. I want to use the exterior panel to also feed a 20 amp 120 volt exterior duplex outlet. There is room in the panel for 2 addtional single pole breakers. Can I insert a single pole 20 amp breaker into the panel to either one of the two busses (black or white), connect the new outlet feed black hot wire to the new 20 amp breaker and connect both the white neutral and bare ground wire to the neutral/ground bar even though there is no existing neutral feed connected to the bar?

jbfan 09-06-2009 09:53 PM


You need a neutral to do this within code.
You can use a transformer of the corret size to do what you want to do.

frenchelectrican 09-06-2009 10:00 PM

DO not attempt that way due you have no netural there at all either rewired the whole circuit or add a 240/120 volt transfomer to downstep and get correct voltage from that set up.

Cost for 2.0 KW transfomer may cost more than you can rewire that circuit.

I really can't tell you the price due I do not know what area you are from and there are few diffrent verison of transfomer you will use so that something you may want to check out on your end.

I can get rough estame of the cost of transfomer if you request it.


J. V. 09-07-2009 11:13 AM

If you have conduit, all you would have to do is push a white THHN wire through to the panel and land on the neutral bar. Then you have 120 volts available. If you do not have conduit you must run a new 3 wire cable. H-H-N-G.

Never use the ground as a current carrying conductor. Never.

All times are GMT -5. The time now is 02:16 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Search Engine Friendly URLs by vBSEO 3.6.1