RV Park

3 replies [Last post]
show75's picture
Joined: 2013-11-08

At an RV site, a recepticle has the hot tied to the 120V hot at bottom of meter and neutral and ground terminated to the neutral of meter at RV site. This is common at all sites. The main service has been bonded and there is only two hots (120/240V) and a neutral to each RV site. Any sugestions on the fix?

W A Werning's picture
Joined: 2014-02-12

What 'fix' do you mean?

V12tech's picture
Joined: 2014-07-11

July 2010 in RVtravel.com: 21% of RVers have been shocked by their RV.

At the service drop / panel the neutral bus bar is bonded to ground. So you should see the ground lead and neutral tied to the same bus (the neutral bus bar).
However, any sub-panel after the primary service drop / panel, from there on MUST maintain / have an isolated neutral.

DO NOT, DO NOT, DO NOT bond neutral to ground in a sub-panel or anywhere after the service drop!

Look up RPBG, or "Reversed Polarity Bootleg Ground."
If you have a bootlegged ground by jumping them at the outlet, all someone has to do is reverse polarity, which is easy to do, and you will have a deadly condition that a 3-prong tester will not detect at all!

Why is this? When you tie neutral to earth ground in a subpanel, you've created a potential parallel path for current to return via earth (ground) - so in the event of a fault, your ground conductor has assumed the role of the return path for current and now everything that you've grounded (sub-panel, appliances, metal fixtures, etc) to that sub-panel is now hot.

All it takes is a preexisting fault, one rainstorm, or wet feet, whatever... and you touching something energized - and you're doing the 60 cycle shuffle.

Once Neutrals and Grounds are tied together on branch circuits, any voltage drop in the neutral will be reflected in the grounds.

A standard 90V to 1,000V non-contact AC tester will reliably beep on an energized surface with as little as 40V AC on it. The larger the surface, the further the trigger distance. See http://www.youtube.com/watch?v=Y8h64X33aKg&feature=plcp for a video of testing a 40-ft RV forced to have a hot-skin condition with various voltages.

sparky377's picture
Joined: 2013-10-07

Many people believe that each outlet pedestal in an RV Park (Article 551) is a separate service. Perhaps it is because the RV park owner sub-meters each site for the purposes of billing the customer for electricity used during their stay. Based on that they connect the equipment grounding conductor (EGC) to the grounded conductor and the result is the RPBG.

A careful read of Article 551, Parts I and VI, will point out that the outlets installed at each site are connected to a branch circuit (see Section 551.72 Distribution). As they are connected to branch circuits in a distribution system the neutral and EGC are not to be connected together.

By the way: Parts II, III, IV, and V pertain to the construction and manufacture of the actual RV vehicle and are of minimal use for the field electrician.

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