Junction boxes....

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Old 10-23-15, 11:08 AM
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Junction boxes....

Well let me tell you, you guys were right on with the info you gave me. Had the electrician out here and as Ray suggested he wants to run the 100 amp sub box off of the 200 amp panel instead of using the metered 100 amp box. He stated it would not work anyway because the feeds into that box were too small and outdated. He also wants to run the larger 4/0-4/0-2/0-4 mobile home service wire as PJMax suggested. He is willing to let me buy the supplies and dig the ditch, the permit will be $130 and his labor $500. All in all I am looking at about $1600 for the job.....I don't think I could get it much cheaper but I do have 2 more electricians lined up for estimates.

Now, what he wants to do is run the mobile home feeder in the ground to a junction box on the outside if each structure then run smaller gauge wire to the new sub panel and the 100 amp circuit breaker. So, is there a certain type of junction box that I will need to accommodate this heavy wire? Is it just like an empty 6x6 outdoor box or does it have to have any type of connection bars inside of it? I plan to order the cable from wireandcabletogo.com and purchase the rest of the supplies from Lowes. I can get the 4/0 cable from the wire and cable place for $3/ft where Lowes would charge nearly $4/foot.
 
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Old 10-23-15, 11:15 AM
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I don't know if I would do the junction box at the outbuilding since you can run the large wires directly into the large main lugs on that panel which should have enough room to accommodate the big wires. At the house panel, the junction box is not a bad idea to avoid having to work with 4/0 in the main panel. I would use something like a 12x12 junction box to have enough room to make the bends and splices. If possible keep that junction inside the garage and use a 2" LB and conduit to the outdoors for the MHF cable.
 
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