Tap Rule?

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trip

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Mobile Home is moved onto an existing site--Service Equipment on pole--200 amp. Disconnect-4/0 out of feed-thru lugs in conduit to trailer panel--can you splice #2 to the 4/0 alum. so it can fit in 100 amp. main in trailer, considered a tap?
 
Re: Tap Rule?

They do make a reducer to do what you want. But I must ask how far is it to this service pole? If it is over 30' from the trailer another disconect has to be mounted just out side of the trailer and 4 insulated conductors ran from it to the panel inside. Grounding conductors are required to be insulated and kept seperate from the neutral after this disconect or from the service if it is close enough.

See 550 in the NEC for all the requirments.
 
Re: Tap Rule?

Can you splice #2 to the 4/0 alum. so it can fit in 100 amp. main in trailer, considered a tap?
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Trip, I don't see anything to prohibit the tap rules in 240.21 from being used but it doesn't seem right to me.

Wayne, is this something that is done on a regular basis in northern Indiana? :confused:
 
Re: Tap Rule?

In a Trailer Park-less than 30' to trailer--feeder stays in place when trl. are moved out.
 
Re: Tap Rule?

240.21(B)Feeder Taps.
I am not too sure if this section covers or permits taps per service entrance conductors.

240.21(D) Service Conductors.
Here it refers one to 230.91

230.46 Spliced Conductors.
refers to 110.14, 300.5(E), 300.13, and 300.15.

Part IV (of Art 230)
230.42 Minimum Size and Rating.

Part III (of Art 550) Services and Feeders.
550.32(A)


Assuming you mean 2AWG copper, I would say that you can splice that onto the 4/0 Aluminum, provided you follow the proper procedure(s).

Pierre
 
Re: Tap Rule?

Originally posted by trip:
Mobile Home is moved onto an existing site--Service Equipment on pole--200 amp. Disconnect-4/0 out of feed-thru lugs in conduit to trailer panel--can you splice #2 to the 4/0 alum. so it can fit in 100 amp. main in trailer, considered a tap?
Click to expand...
The conductors Trip wants to tap are not service conductors, they are feeders, tap away. :D

If the disconnect is a 200 amp fusible switch you could also put fuse reducers in it and install 100 amp fuses. If you did that you would not have a tap at all, just a 100 amp feeder.

Bob
 
Re: Tap Rule?

200 amp. main Breaker with space for addional eqipment(outbuilding--structure--etc.)at pole, to put 100 amp. breaker here I have the same problem at both ends--wire to big for breaker--feeder is to be left in place.
 
Re: Tap Rule?

By Charlie: Wayne, is this something that is done on a regular basis in northern Indiana?
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Not to often. as most newer trailers will have a 200 main. We have a few trailer parks that has all new service equipment, and the service breakers to the trailers are 200 amps we have done it both ways leave the 200 amp main and run 3/0 copper to a 100 amp fused trailer disconnect then 3 insulated #3 conductor 1 #6 insulated grounding conductor into the trailer. The state HUD AHJ requires the disconnect to be no closer than 2' to the trailer and at least 2' off the ground.

The other way if the service equipment is close enough to the trailer we just install a 100 amp main breaker in the service equipment and the 4 #3's from it to the trailer.

We only had a couple times where the under ground feeders were already installed and had to locate those reducers to allow the wires to terminate on a 100 amp main in the trailer. They do make a nice job of it also, and torquing the connection is a must.

I must add that if the distance to the outside disconnect is more than 150' then it too will have 4 conductors ran to it as we don't want to have any neutral voltage drop imposed on the grounding.
 
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