Expert: Master Bob - 7/31/2005

Question
Hi,
I have an existing 60 amp dryer circuit that is disconnected and not being used.  I would like to convert this circuit to 4 separate 15 amp circuits using a subpanel. Can a subpanel be installed with those wires that were once connected to a dryer outlet.  These wires are connected to the main breaker box to two side by side 30 amp breakers.  The area where the wire ends is basically where I would need those 4 new 15 amp circuits so I'm hoping this will work.  If it can?  What type of sub panel would I need? Or maybe you would have another suggestion to split the amps?  Any information would be greatly appreciated.  Thanks.

Answer
Hi Donald,

 Based on your description....you have the standard 30 amp dryer circuit (the 2 side by side 30 amp breakers equals one double pole 30 amp breaker...not 60 amp - the amps are not additive).....and could then mount a 30 amp sub-panel in the former dryer receptacle outlet area....as long as the wire is 4 wire..( typically a #10/3 with ground)...having the two 120 volt hots, 1 neutral and 1 ground. If it is an older dryer circuit...it may only have 10/3 - with no ground - and if so, you wouldn't be able to mount a sub-panel there without changing out the wire - it must be 4 wire. The sub-panel would also have to have a seperate equipment ground bar added (generally not included with the panel and bought seperately) and this ground bar will mount directly to the panel back metal trim to the factory holes and must be kept isolated from the neutral buss - do not use any of the bonding screws that come with the panel.

 If your dryer feed is 4 wire...such as the 10/3 with ground cable run to this position...you could mount the sub-panel there as above (NOTE: you'll find even the smaller panels rated for a 100 amps or better...now the Code minimum panel rating - but you can always feed it with less..in your case the 30 amps..but never more) and install four 15 amp breakers to feed your circuits if you've only run #14 wire...which is not recommended (the recommended being #12 wire with 20 amp breakers...15 amp circuits and #14 gauge wire is simply too small for most of today's loads..overloads too easily). Be sure all work is done to Code...and have the work inspected. In most areas - this type of work requires a permit.

 Hope this helps...if you need more details or have new questions, please follow-up.

Best Wishes,

Bob Osgood
Master Electrician

RKO ELECTRIC

www.rkoelectric.com