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Posted by on January 30, 2007, 4:52 am
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.
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Posted by Dean on January 30, 2007, 6:19 am
On Jan 30, 3:52 am, scal...@ptd.net 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.
I had the same idea to power a tankless water heater but found it
better for My place to upgrade to a larger,higher amp panel..
Members here might need more info as to what Your existing set-up
is to give You the best help;;What amp is the main in Your box? Is the
existing panel full or are there unused circuits? Are You adding 15
amp circuits? 20 amp? larger? What amp is the service from the meter
outdoors? Do You have specific uses in mind for the new circuits so
the amp draw can be estimated or just general use?
I'm not a Sparkie but am interested after My recent upgrades..
Dean
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Posted by RBM on January 30, 2007, 7:20 am
As Dean said, you need to furnish a lot more info. When you say that subs
you see are only 1 phase, you're correct, it's rare for a residential
service to have 3 phase. Are you looking to connect a machine that requires
3 phase or just not familiar with the terminology? You will need to know the
size of the existing service and some idea of what's attached to it
currently. You'll also need to provide details of what you're looking to
connect in the basement, to determine the feeder and panel size. BTW single
pole breakers do come in larger than 30 amp, however its usually more
practical to build the device to operate at 240 volt and keep the amperage
lower
> 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.
>
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Posted by BobK207 on January 30, 2007, 11:36 am
On Jan 30, 1:52 am, scal...@ptd.net 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.
OP-
I believe you mean "legs" ..........or do you really mean
phases...????
I suggest using a Square D QO Load Center..the one I'm thinking of has
8 breaker slots (100 or 125 amp rating; I think) & is feed 220V ( 2
legs) via a double pole breaker from the main.
Now you have sub panel that is mini version of your main...two legs,
across which you have 220V when you use a double pole breaker.
If you really mean phases & you're trying to get 3 phase power out of
a residential service you're sol unless you buy a phase converter.
but I'm pretty sure the first part of my answer will get the job done
for you, since it seems like you're just looking for more amps for a
heavier drawing load....and the way to get that is on a 220v circuit.
cheers
Bob
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Posted by on January 30, 2007, 11:41 am
On 30 Jan 2007 01:52:21 -0800, scaloni@ptd.net 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.
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.
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