On Tue, 30 Jan 2007 11:41:30 -0500, wrote:

On 30 Jan 2007 01:52:21 -0800, wrote:

Hello, I want to install new circuits in my basement and I want to do
it off of an electrical sub panel. The subs i see are only 1 phase.
How to I tap into the main box? Do i still use a double pole
breaker? Single pole breakers only go upto 30 amps. I want to run 4
separate circuits off the new box. Thanks.


Actually most sub panels do use 2 hot legs (240v and 120v),
don't confuse that with the term, "single phase". That is really one
"phase", center tapped to give you two 120v circuits.

It can be one phase or two, depending on your reference point.
However, either way it's not three.

You use a 2 pole breaker in the main panel and be sure to run a 4 wire
feeder to the sub. Buy the extra ground bus kit. Leave the bonding
screw off the neutral bar, connected to the white wire in the fereder
and it stays insulated. The bare/green wire in the feeder goes to the
supplimental bar and that is where your ground wires go.
--
Mark Lloyd
http://notstupid.laughingsquid.com

"Unlike biological evolution. 'intelligent design' is
not a genuine scientific theory and, therefore, has
no place in the curriculum of our nation's public
school classes." -- Ted Kennedy