Wanderer Motorhome Page 12

Driving in France?
Then this web site is a must:

email Brian,

Environmentally Safe Toilet Treatment for motorhomes, caravans and boats:

For a Holiday with a difference in a Motorhome, see this link:

Great Ormond Street Hospital
Children's Charity 
Great Ormond Street Hospital, Children's Charity, 40 Bernard Street, London.  WC1N 1LE
Tel: 020 7239 3000 
Click on the link to donate

As author and maintainer of this web site. I do not save, retain, or sell  any email addresses of those who email me. Should you not get a reply from me, please send again, I might have missed it in my spam catcher!

Additions to Motorhome pages:-
1.Fitting New Automatic Water System Pump
2.Winterising the water pump.
3.Water Tank Level Meter-modification to electronic circuit

4.Basin Mixer Taps - tip & how to repair a dripping tap.
5.Extending Fresh Water Drain Tap to Outside

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Our MH has now been sold so this web site will not be updated again

[click above for pictures]

Due to my age, 80 years old, and health reasons we are forced to give up the pleasures of a motorhome,  and has now been sold.

Description of the motorhome can be seen through out the pages of my web site here.

The MH has MOT until MAR 2017 and its mileage is 109224

To Page Links & Contents Index

1. Contents:

1. RCD Typical fitting 2. The Plug in Tester  3.  The Electrical Trip  4. Reverse Voltages Continental Sites. 
5.  Reverse Plug Drawing

RCD Installation 

The RCD in the Motorhome


        The RCD unit is designed to give both overload and earth leakage protection for the electrical supply in the Motorhome. The RCD is usually tested by pressing the test button. The main switch them drops out. If a fault is still present you will not be able turn the main switch back on. This test button must be checked periodically, with the main switch turned to the on position and live mains connected.

        The Miniature Circuit Breakers, inside the RCD box container, are really mechanical fuses which will cut out during an overload or short circuit.

         This will turn the mains supply off automatically, isolating the mains supply from the Motorhome. The MCD’s, which replaces the wire fuses, are a much more convenient switch device, where you might not have a fuse available.

          The RCD is useful as a control switch for the whole Motorhome, as this is the first in line, from the caravan site input to the van, to the Motorhome for all the electrical appliances.

          The RCD is a balanced device which depends on a good earth, when 'Misbalanced' by a resistance to earth, this can be a hand touching a live terminal. This switch will trip out at the usual current of 30Milliamps. Research elsewhere has shown that 30Milliamps is safe for the human body.

          On one site in Spain no earth was indicated on our test plug. This meant if we had an electrical fault the RCD would not have tripped out.

          See the drawing and picture below for a typical installation, this is in our Motorhome. A not very convenient position, when the wardrobe is full of clothes!

Click for larger image

Charger and RCD fitted inside the wardrobe of the Wanderer.

The Mains 230vAC Electrical Trip Device

The Plug in Tester

I must take up the issue of the Mains earth and the plug tester, as I feel this could cause confusion and worry to others.

The phrase 'Connection to earth is made via the tyres.' Not true, I emphasise this is not true. All Motorhomes can be considered as an electrical device connected to the mains, as for example an Electric Fire at home. The electric fire has three wires connected, Live, Neutral, and earth. The earth is connected to the metal frame. Any faults and the electric is taken back to the mains via the earth wire. The manufacturer ensures this wire is attached to the frame very securely.

It's the same with the Motorhome any appliance fault and the electric is taken back to the mains power station via the earth cable through camp site supply. Hopefully before then the Motorhome Mains on/off switch will have tripped.

The slight difference, but important, with the Motorhome to an electric fire is; a cable is connected, as an added earth wire, from the earth of the Motorhome electrics, and is attached to the vehicle chassis, plus any metal wall covering.

This should be considered during Habitation checks. Somewhere on the habitation check sheet this attached cable should be checked and ticked off. How many Motorhome owners know where this earth cable is attached to the chassis?

 Regarding the 3pin plug tester. This device checks three cables only, the Live, Neutral, and earth from the mains input. And ensures the electric socket is correct back the mains or camp site supply.

It does not check or is meant to cover any fault to a camp site field earth via tyres! Just as one would not check any fault to a kitchen floor when you plug in the electric fire at home. What is important is the earth cable previously mentioned, is it attached to the vehicle chassis?  

In my case recently  I checked the earth cable to chassis and found it had fallen off due to corrosion and deterioration in metals caused by oxidation or chemical action, for how long I wondered! The 3 pin tester showed the earth was correct. It is this earth wire which is never given prominence in Motorhome literature.

 If anyone feels he has an earth problem then he should be looking at this cable to ensure it is attached to the chassis. Also the coach builder will have connected a cable to the Motorhome metal walls somewhere.

Incidentally the earth wire attached to the chassis should have a metal label displayed, as seen in most homes these days, 'Safety Electrical Connection, do Not Remove'

During a visit to a Spanish camp site my plug tester showed no earth. I attached an earth wire from the vehicle chassis to a tent peg, but, as expected, the plug tester still showed an earth fault!


Reverse Voltages Continental Sites. 

    Continental socket  & wiring

    Wiring the Continental Socket.
    Note the Earth and Neutral wires close together in the socket.

    Continental Plug & wiring

    Wiring the Continental  Plug.

Showing the correct fitting

Plug in the U.K. position.

Showing the reverse fitting

Plug in the reverse [Continental] position.

Only those confident with mains electrical wiring should attempt this modification, due to continental plugs and sockets having no markings for LIVE and NEUTRAL wires.

    Plus the wiring has to be checked for correct phase, after installation in this country.

     The cable must be suitable for carrying 16Amps AC.

Reverse Plug Drawing.

The plug is rotated 180degrees for reverse voltage correction.

Reverse Voltage Modification

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