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Subpanel I am installing the subpanel a distance away from the main panel. After I run the heavier wire from the main to the sub I will need to run the existing wiring from the main panel to the subpanel. What is the best way to accomplish this?

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The only way unless the existing wiring is long enough or can be re-routed to the new sub is to use junction boxes with covers and wire nut to connect the wires ( make sure that the wire is the same as the wire you are connecting to and install breakers to accommodate the amperage rating of the wire examples are # 12-20 amp, #14-15 amps , # 10-30 amps # 6 50 amps do not put any 220 volt and 120 volt in the same junction box and no low voltage wire in with 120 or 220 volt wires , if you will need to splice the range wire or any wire larger than #10 i would recommend replacing with new wire if this is not possible then use only connectors approved for the wire to be used .good wiring !

Posted on Dec 24, 2008


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Electical panel

1) Add a subpanel using extra breaker space:

2) Choose correct wire and breaker.
Increase to next larger size for distances over 100 feet from breaker.

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4) Add a comment

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How do I run from a 100 amp main panel to a 60 amp subpanel, 125 from my house to the garage

See 60 Amp sub-panel image

Above image shows drawing of 60Amp sub-panel located next to main panel. Drawing shows #6 wire... 125' distance to garage calls for #4 wire. I ran #4 to my barn and have no problems.

Give thought to how many new breakers you want at garage.
See photo of subpanel that holds three 240V breakers

Using drawing as a guide. Replace existing 240Volt breaker with new 60 Amp breaker. Two hot wires connect to new 60 Amp breaker. Neutral connects to neutral busbar.

More space: You can free up space in main breaker box using a tandem breaker. Or by doubling up 2 lightly used 120V circuits onto one breaker. Do not double-up on 240 Breakers

Conduit: You want PVC conduit large enough to fit three #4 wires. Bigger conduit is easier to pull wires ... and maybe later ethernet wire, or alarm wire etc.

Ground wire: You can put a ground rod at garage and run #6 bare copper between sub-panel neutral-busbar and ground rod. Attach ground wire firmly with grounding clamp.

I want you to check with local electrical supply for exact code in your area concerning conduit requirements, grounding, and wire size. Tighten all lugs very tight against wire.

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I have a 200amp main with a 150amp sub panel and I'm not sure of the wire size I would need for an 80 foot run. With the multiple answers I got confused. I was told 2/3 w/ground, 2/0, 2awg or #2. Also, I...

All of the answers you got were all for the same product, it's just being said differently. 2/0 is the correct wire size. I think this question may be old, so you may have already completed your project. By the way, with copper, the voltage drop on an 80 ' run is 0.8 %. On aluminum it is 1.56%.

At any rate, a 150 amp sub-panel with 20 circuits running on a 200 main amp can easily be overloaded. You should probably have a 300 or 400 amp main with a subpanel that large.

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You need to run the appropriate size wire from the main panel to the new sub panel. I would recommend getting a electrical contractor to do this for you.

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