RV Park

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jugband1

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In a nut shell I am trying to determine if it is permissable to run #2 triplex pole to pole in an RV Park. This triplex is fed from SE cable that runs up the first pole out of a 2 pole breaker from an outdoor MDP. The triplex then continues pole to pole with taps at each pole feeding a GFI outdoor disconnect ahead of a receptacle for each vehicle site.

The neutral is isolated from the enclosure case which has a grounding electrode conductor connected to a rod. The question is "Does this fall under the standard sub panel requirements of a fourth wire"?

Looking at 551.72 in the handbook it states that it is "required to have single phase 120/240 3 wire systems since RVs are designed for connection to such systems"?
Since I work in an urban area this RV Park topic is not one that I am familiar with.
Anyone familiar with this application?

Thanks,

Fran
 
Fran,

You have to have an insulated grounded (neutral) conductor AND an equipment grounding (green or bare) conductor for all 120V receptacles.
The grounding electrode (ground rod) is of no help for equipment grounding.
 
What you have is several sub panels.The neutral and grounds need to be seperated and will need ground wires.The rod does not clear faults.Only way out is if all you need is 120 volts.Read 551 and you will see requirements for 240 volts 50 amp on a percentage.Good luck.Another way out is if you can treat each panel as a seperate service.
 
Look at 555.71.
551.76 Grounding — Recreational Vehicle Site Supply Equipment
(A) Exposed Non–Current-Carrying Metal Parts Exposed non–current-carrying metal parts of fixed equipment, metal boxes, cabinets, and fittings that are not electrically connected to grounded equipment shall be grounded by a continuous equipment grounding conductor run with the circuit conductors from the service equipment or from the transformer of a secondary distribution system. Equipment grounding conductors shall be sized in accordance with 250.122 and shall be permitted to be spliced by listed means.
The arrangement of equipment grounding connections shall be such that the disconnection or removal of a receptacle or other device will not interfere with, or interrupt, the grounding continuity.
(B) Secondary Distribution System Each secondary distribution system shall be grounded at the transformer.
(C) Neutral Conductor Not to Be Used as an Equipment Ground The neutral conductor shall not be used as an equipment ground for recreational vehicles or equipment within the recreational vehicle park.
(D) No Connection on the Load Side No connection to a grounding electrode shall be made to the neutral conductor on the load side of the service disconnecting means except as covered in 250.30(A) for separately derived systems and 250.32(B)(2) for separate buildings.
Click to expand...
You must run an EGC with the circuit for an RV park. There are no exceptions.
Don
 
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