Ask Experts Questions for FREE Help !
Ask
    hotmudder's Avatar
    hotmudder Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Mar 9, 2010, 10:01 PM
    Electrical sub panels 100 amp wire size
    I want to put a 100 amp sub panel in my new attached garage. What size wire do I need for a approximate 65 ft run? Also, since the whole house is finished, I will have to come outside and run a conduit along the outside of the house to the garage. What size concuit do I need? Finally, what size circuit breaker do I need at the main? Would I need 100 amp, or a double 50 amp?
    Thanks, Jack
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #2

    Mar 10, 2010, 08:56 AM
    Need a two pole 100 amp breaker for a 100 amp feeder and panel.

    Can use 3- #3 THHN/THWN copper and 1 # 8 THHN/THWN/ Green copper,

    Or,

    3- #1 XHHW Aluminum and 1 - #6 XHHW Al in 1/1/4" conduit.

    If your running Sch 40 PVC conduit horizontally outdoors, it may need one expansion coupling.

    The neutral bar in the subpanel will need to be insulated and not bonded to the metal box, and the equipment ground conducotr will need to connect to a equipment ground bar, for all green and bare grounds, bolted directly to the metal box using machine thread screws.
    hotmudder's Avatar
    hotmudder Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Mar 10, 2010, 09:49 AM
    Thanks for your answer. Would it be easier to use emt rather than pvc? Also, what size conduit for that size wire? Finally, do I need to put a ground wire outside to grounded stakes? If I use emt, that would be connected to the main 200 amp house supply, and would be the ground back to the main.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #4

    Mar 10, 2010, 01:47 PM
    Which is easier will be up to your abilities and knowledge. You will need rain-tight compression connectors and couplings for EMT. 1-1/4" EMT is the size needed for the conductors I listed.

    No, since the garage is attached, no ground rod is needed.

    While EMT can be used as an equipment grounding conductor, I highly recommend that you pull the # 8 Cu or #6 Al equipment grounding conductor.
    hotmudder's Avatar
    hotmudder Posts: 3, Reputation: 1
    New Member
    		  
    #5

    Mar 10, 2010, 03:51 PM
    Quote Originally Posted by tkrussell View Post
    Which is easier will be up to your abilities and knowledge. You will need rain-tight compression connectors and couplings for EMT. 1-1/4" EMT is the size needed for the conductors I listed.

    No, since the garage is attached, no ground rod is needed.

    While EMT can be used as an equipment grounding conductor, I highly recommend that you pull the # 8 Cu or #6 Al equipment grounding conductor.
    Thanks again!
    Decided to go with pvc, and will pull wire with ground conductor
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Can I run a 50 amp subpanel if a 100 amp main if so what size wire [ 1 Answers ]

Can I run a 50 amp subpanel from a 100 amp main and if so what size wire

100 amp breaker wire size [ 5 Answers ]

Will #2 aluminum wire fit a 100 amp cutler - hammer circuit breaker

100 amp wire size [ 3 Answers ]

I have a 150 amp service feeding a 100 amp main lug sub panel. I need to move the sub panel to another location during a remodel. My question is what size copper wire is needed to lengthin the panel feeds, including the ground. The total distance from the main is approx. 40 feet. Planning to use...

100 amp sub panel wire size [ 2 Answers ]

I now have the 100 amp breaker installed in my load panel. I will run wiring from the load panel to a 100 amp sub-panel in an unground 80 schedule PVC. I believe I need to use #2 wire for the hots and the neutral. If this is correct, then what size ground do I use? Number 6? The sub- panel...

Wire size in a 100 amp breaker [ 1 Answers ]

I was wondering if a 2/0 wire will fit in a siemens 100 breaker? Thanks for your help

View more questions Search