sub panel??

[myvalk]

ok... heres the situation.
a new addition, with an 8 full or 16 half breakers in the sub panel.
the sub panel is being fed by a cable that was used for an electric range, 50 amps.. plenty for the addition.
question is.....the panel has one ground bar (is that what its called?)
do i hook up both neutral and ground wires to that bar? or do i have to install a seperate bar to keep grounds and neutral apart. and if so, do i send the ground to a grounded re-bar in the earth?

thanx

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never mind... i have to run new wire. that wire is only 3 wire, ill need 4 wire to have a seperate ground, neutral, and two hots.

ill be back..

so.. for a panel with 5 - 15 amp breakers and 3 - 20 amp breakers... what size wire and main breaker would i need.. thanx ... again

[mdshunk]

never mind... i have to run new wire. that wire is only 3 wire, ill need 4 wire to have a seperate ground, neutral, and two hots.I'm glad you realized that on your own. I almost started to make fun of you and tell you that you don't have any business messing with this. :D

so.. for a panel with 5 - 15 amp breakers and 3 - 20 amp breakers... what size wire and main breaker would i need.. thanx ... again It doesn't matter what size or number of breakers are installed in the subpanel to calculate the feeder and feeder overcurrent protection size. You need to do a demand load calculation for the load in that panel. Can you describe the exact loads that are served by each breaker, and I can hash something out for you :?:

[myvalk]

sure enuf...
15 amp breakers....
1- oulets ( 8 )
1- smoke detector
1- outside lights. (one on each side of the door, 100 watts max each.)
1- ceiling paddle fan and light. (4 bulbs x 60 watts and fan motor.)
1- 3 hanging lamps above bar. (100 watts max each.)

20 amp breakers....
1- 220v for electric heat. ( 3500 watts total)
1- 220v for electric heat. ( 3500 watts total)
1- spare for future use if needed.

and thanx for your kind help.

[mdshunk]

You should run a #6 feeders protected by a 50 or 60 amp breaker in the main panel. Your subpanel is not required to have a main breaker, since the subfeed is protected by the the 50 or 60 amp breaker where it originates in the main panel.

[myvalk]

so thats a #6 - 4 conductor.
and do the ground and neutral hook up together, or do i put a new bar in for the ground? and thanx again.

[giddonah]

shunk, is that #6 Al or Cu? I don't have my book right now. I'm on the other side of orange county and here it's easy to find Al at the 'depot.

The manufacturer should have a separate ground bar kit you can buy to install in the panel. I just did this with Murray stuff.