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Topic Title: Campervan 240v Hook up?
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Created On: 01 January 2010 06:38 PM
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 01 January 2010 06:38 PM
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MrAmps

Posts: 386
Joined: 11 December 2006

Happy new year all.

Not got my red book handy.

whats the norm for installing 240v hook ups to camper/motor homes.

Obviously the RCD consumer, but do you connect the chassis to the earth bar in the consumer or not?

It seems common sense to me but what affect ,if any, does it have on the negative grounding on the 12v side?

regards
 01 January 2010 06:52 PM
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slittle

Posts: 3374
Joined: 22 November 2007

From memory, yes,bond the chassis but my red book is out of reach as well.

I can't think of too many issues as far as mains earth and -ve 12 volt is concerned, other than possibly mains powered battery chargers with metal cases. I remember a problem we had a on a vehicle years ago which didn't like metal cases battery chargers being sat on it.... trouble is I can not remember why or what the fix was.


Stu
 01 January 2010 07:00 PM
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luggsey

Posts: 261
Joined: 20 January 2008

I don't think 7671 covers the wiring in a caravan?
I used to test petrol tankers earth system years ago, they were fully insulated so the chassis had no neutral/return/ground connections to it.
Bit of a bugger to do mind you!
That would allow problem ferr bonding!
 01 January 2010 07:11 PM
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alancapon

Posts: 5699
Joined: 27 December 2005

BS7671:2008 Section 721 covers caravans and motor caravans, with Annexe A to this section covering the DC battery side of things. All structural metal parts that are accessible from within the caravan / motor caravan need to be connected to the MET (721.411.3.1.2).


Regards,

Alan.
 01 January 2010 07:22 PM
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MrAmps

Posts: 386
Joined: 11 December 2006

Thanks Alan,

I thought I was going mad there, I was sure it was in the new regs.

Im a little worried now about other Campervan owners. The campervan in question is mine and I only aquired it in the summer. whilst thinking of giving it a 240v hook up this problem occured to me.

There are various VW forums etc who have their own 'experts' on the matter and I have read a few posts stating that the chassis shouldnt be connected (bonded) to earth. This rang alarm bells to me so I thought I would put the matter to the forum. I think its my duty as a 'Competant person' to correct any misconceptions that people have but I want to get my facts right first.

BS7671 is a good start!
 01 January 2010 07:25 PM
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lyledunn

Posts: 582
Joined: 13 August 2003

Section 721 applies. Bonding only required to chasis where chasis parts are exposed within the motor home.
Dont think any "negative" effects (forgive pun) on battery ground. However, the LV protective conductors should not carry load current when battery connected and serving equipment in motor home.
Somebody is obviously thinking of sunny times ahead??

-------------------------
Regards,

Lyle Dunn
 01 January 2010 07:33 PM
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alancapon

Posts: 5699
Joined: 27 December 2005

The "Annexe A" bit is worth a read, and covers all sorts of things, including proximity to LPG gas installations as well as the 12v DC side.


Regards,

Alan.
 01 January 2010 07:33 PM
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MrAmps

Posts: 386
Joined: 11 December 2006

Exactly.

Early camper vans have lots of exposed metal work inside. The chassis, floorpan and side walls are all connected together. the floor is usually covered, but the side walls have lots of bare metal.

For example, I own a 76 Bay and it has plenty of exposed metalwork inside to touch in the event of a Live/earth fault!

Me buying a campervan has probably guaranteed us another lousy summer - sorry!!
 01 January 2010 08:01 PM
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luggsey

Posts: 261
Joined: 20 January 2008

OOps, I missed that when I looked quickly!
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