RV campground

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While most campers are wired for 120-volts, some newer campers are requiring 240-volt. How are you going to supply them from a 208-volt service? If the campground is going to supply 120-volt camper receptacles only, you could be OK.
 
Jimmyabtl said:
can you install a 120/208 3 phase service to an RV campground?
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It seems to me that if you were to provide a 120/208 service you'd have to raise the voltage (transform up) for feeders and branch circuits to comply with those areas of the code that state 125/250..(551.71 etc.,)..they may be talking nominal, but still I think the intent is for 120/240-125/250, not 208 which would, IMO, be too low. :)
 
some newer campers are requiring 240-volt
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That should not be happening.
551.40 120-Volt or 120/240-Volt, Nominal, Systems
(A) General Requirements The electrical equipment and material of recreational vehicles indicated for connection to a wiring system rated 120 volts, nominal, 2-wire with ground, or a wiring system rated 120/240 volts, nominal, 3-wire with ground, shall be listed and installed in accordance with the requirements of Parts I, II, III, IV, and V of this article. Electrical equipment connected line-to-line shall have a voltage rating of 208–230 volts.
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Don
 
Bob,
I don't see anything in 550 that says that you have to supply 240 volts, the only rule is that you have to match the power supply to the rating of the receptacle.
Don
 
don_resqcapt19 said:
Bob,
I don't see anything in 550 that says that you have to supply 240 volts, the only rule is that you have to match the power supply to the rating of the receptacle.
Don
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551.4(B) refers to the nominal voltage the wiring system(s) within the RV are required to have, namely 120/240. 550.20(F) refers to the 120 or 120/240 volt system with regard to receptacles. Generally, it is required that the electrical equipment is rated 120/240 as per Part V 551.40. See 551.46(C)(4) for 125/250 (its nominal so it could mean 120/240) and also see 551.46(D) for a graphic depiction of the 125/250 volt nameplate. I don't know what would happen to my air-conditioners in my Class A motorhome if I plugged in to a 120/208 feeder/service and I don't want to try.
551.72 states that receptacles of 50 amperes shall be supplied from a BC of the voltage class and rating of the receptacle. :)
 
don_resqcapt19 said:
Bob,
I don't see anything in 550 that says that you have to supply 240 volts, the only rule is that you have to match the power supply to the rating of the receptacle.
Don
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Everything in there refers specifically to a 120/240 supply system.

Specifically look at the required marking in 551.46(D).

'.....that reads, as appropriate, either

110-125 Volt AC

or

120/240 volt

There is no option for a 208 version.

IMO I can not supply any appliance, equipment, RV etc. marked 120/240 with 208/120.
 
wbalsam1,
551.4(B) refers to the nominal voltage the wiring system(s) within the RV are required to have, namely 120/240.
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551.40(A) tells us that the 120/240 equipment must be suitable for operation at 208 to 230 volts.
551.72 states that receptacles of 50 amperes shall be supplied from a BC of the voltage class and rating of the receptacle.
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After looking at this a bit more, the above does require a 120/240 volt system as there are not any single phase receptacles rated 120/208.
Don
 
19-80 Log #3090 NEC-P19
(551-40(A))
Final Action: Accept
Submitter: Barry Bauman, Alliante Energy
Recommendation:
Add the following sentence to the end of paragraph: Electrical equipment connected line-to-line shall have a voltage rating of 208-230 volts.
Substantiation:
Many recreational vehicle parks require a service larger than is available from a single-phase service or they require a 3-phase service for 3-phase loads. Due to the unavailability of 120/240-volt 3-phase service from the providing utility, the park will be served with a 120/208-volt 3-phase service. As newer recreational vehicles add more electrical amenities line-to-line connected electrical equipment may be used. Requiring the recreational park owner to install a transformer to convert from 120/208-volt to 120/240-volt for line-to-line connected equipment is an unnecessary burden. Requiring any line-to-line connected equipment to be rated 208-230 volts will prevent future voltage incompatibility problems.
Panel Meeting Action: Accept
Number Eligible to Vote: 13
Ballot Results: Affirmative: 12
Ballot Not Returned: 1 Zieman
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It appears that the panel's intent is to permit 120/208 volt systems to serve the line to line loads, but the other code sections were not changed to permit this. Note the lack of a panel comment for this proposal.
Don
 
Nice research, Don.

I've often wondered why code panels don't split up the 1st part of Articles 550 and 551 to breakout the requirements for "manufactured home interior wiring" and "vehicle wiring" and put them somewhere else and breakout the exterior wiring into their own respective Articles. :-? :)
 
I dont think this a good way to go.i camped for years and never exspsected a 208.While all my loads were 120 and other than the high end motor homes i dought it cause a problem.Keep in mind the adapters motor homes use.Very few are set up to need more than a 120. Very few are not set up to 120 only
 
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Jim W in Tampa said:
I dont think this a good way to go.i camped for years and never exspsected a 208.While all my loads were 120 and other than the high end motor homes i dought it cause a problem.Keep in mind the adapters motor homes use.Very few are set up to need more than a 120. Very few are not set up to 120 only
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Mine is set up for 120 volts or 125/250. If I want my air on and don't want to run my generator, I'll plug the motorhome in to a double pole receptacle. Everything works better that way. :)
 
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