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Old 02-20-2008, 11:09 PM   #16
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100Amp Service


Thanks Stubbie..yeah the trailer is 115ft. from the shop and was thinkin there would be a voltage drop also in the #4. If I were to stay with the 100Amp breaker from the 200 for a while till I can find a 90A breaker, the wire wouldnt get too hot?

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Old 02-21-2008, 01:00 AM   #17
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Your voltage drop on #4 copper for 115 feet would be 3% right at the recommended feeder maximum value provided you don't suffer any voltage drop at the 200 amp panel.
Make sure the poco is understanding you want 200 amp service not just a change in the service configuration.

The wire doesn't get dangerous hot till you max it out on it's amperage rating. #4 used at thwn ampacity used as a sub-feed is 85 amps but you are allowed a 90 breaker since this doesn't fall on a standard size breaker. Putting it on a 100 isn't probably proper but this is one area where I know there are a lot of #4's on
100 amps doing just fine. However you should manage your load at the mobile home to keep it in reason till you get the new breaker.

Last edited by Stubbie; 02-21-2008 at 02:26 PM.
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Old 02-21-2008, 02:08 PM   #18
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I would check with the AHJ about the wire size. As a feeder for the mobile home service I do believe most will allow 310.15 B 6. They have in my neck of the woods anyway. It would be worth asking before replacing the breaker. Let us know what you find out. I agree with Stubbie on the ground rod at the mobile. With a 4 wire feeder the grounding electrode system will be at the main panel. However around my area we are required to install an equipment grounding conductor to the mobile home frame and water piping system.
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Old 02-21-2008, 02:25 PM   #19
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Unfortunately he says there is no AHJ.....
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Old 02-22-2008, 08:57 AM   #20
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We just started building permits and inspections in my area 2 years ago. AHJ's were a city phenomenon before that. So, if the POCO has no objection, it will be the OP's call.
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Old 02-22-2008, 03:14 PM   #21
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Can I feed a 70Amp subpanel off a 100amp subpanel thats powered by a 200Amp main meter panel? This is a different structure. The 100Amp mainlug subpanel is going to have 4 doublepole 30Amp breakers for 3 dryers and a water heater, and 6 20amp circuits. The 70 Amp will have just 20Amp circuits.
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Old 02-22-2008, 04:22 PM   #22
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Jambug

Not to be condescending but we need to be informed of everything you intend to do. 3 clothes dryers? You work at lot in the mud and dust or something?...housing for illegals maybe??? Those clothes dryers if operating together would be minimum 65 amps of current and the hot water heater if a small 10 or 20 gallon one another 20 amps or so.... your looking at conservative 90 amps just with those appliances. Your design is falling apart by trying to feed too much load on a 100 amp feeder from the 200 amp panel.

You have also brought up 100 amp main lug panel that you have not mentioned till now. So are you now saying you have a 100 amp feeder to your trailer from the shops 200 amp panel then another 100 feeder from the 200 amp panel to a 100 amp mlo panel and then a feeder from that mlo panel to a 70 amp sub-panel?

ONE WORD .....NOOOOOOOO!!!!

You need to get a electrical contractor in there and get this all designed by a qualified individual.

Last edited by Stubbie; 02-22-2008 at 04:25 PM.
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Old 02-22-2008, 04:29 PM   #23
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Hey Stubbie..Ive got someone with a 200Amp service main meter panel. On that he has a 60Amp subpanel(all six spaces used w/ 20amp circuits) and a 100amp subpanel(3 out of 8 spaces used w/ 20amp circuits) separately ran to the 200Amp. Now there is a new addition thats requiring another subpanel, I was thinking another 100Amp would do the trick. Theres 6 -20Amp circuits and 4-30Amp double for 3 dryers and a water heater on the new addition. The existing 100Amp Subpanel is right on the otherside of the wall where the homeruns for the new addition are. I was thinking he could run 5 of those new 20Amp homeruns into the 100Amp and the rest to the new subpanel. This is 2-story home with a little eating diner below and he's planning on more additions to this one structure.

We are in a remote small community area in Az. and is hard to find an electrician out here. I know about residential wiring basics but dont know about how many subpanels you can use on a 200Amp main.
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Old 02-22-2008, 04:33 PM   #24
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this is a different structure from my mobile home and shop. This other guy has a small diner and wants the 3 dryers and 2 washers for a mini laundry mat.
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Old 02-23-2008, 09:30 AM   #25
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Quote:
Originally Posted by jambud View Post
this is a different structure from my mobile home and shop. This other guy has a small diner and wants the 3 dryers and 2 washers for a mini laundry mat.
So this is a different job? You're doing electrical contracting work?
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Old 02-23-2008, 09:48 AM   #26
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Yeah this is a different job I shoulda started a new thread sorry. But this is for a friend, not really a contracting job we are just trying to help each others out. I do know how to rough and trim a basic home but the subs and additions are throwin me a little.
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Old 02-23-2008, 10:03 AM   #27
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This is not a city so there are no inspections just trust..haha. We are in Northern Az. on the Hopi reservation but we get a lot of tourists out here. Sorry to stray from electrical but...this other job is a 2-story home that turned into a part restaurant on the bottom floor. the kitchen is wired to a standard home so there are standard ovens and fridges. But I did run them dedicated after the owner decided to open a restaurant. Now he made an addition onto the 2-story for a mens/womens bathroom, laundryroom w/ 2washers, 2 dryers, and 30Awater heater. And an office
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Old 02-23-2008, 10:04 AM   #28
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I see.

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