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Topic Title: Advice on a temp supply for a marquee and band etc
Topic Summary: Not sure about the rcd set up required.
Created On: 10 April 2013 10:08 PM
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 10 April 2013 10:08 PM
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aligarjon

Posts: 2802
Joined: 09 September 2005

Hi Guys. i am after a bit of advice about a temporary supply for a marquee for a wedding reception in a field. The company supplying the marquee and band etc have requested 2 32amp ip65 sockets to connect their own dist boards etc to. The sockets are to be located on the side of a garage that is about 50m from the main house. There will be a bar, lots of lighting etc and a band that all require power, they will take care of all of that, all i am providing is the sockets.

PME is available so i will take that to a temp dist board in the garage but i am not sure what to do about earthing from there, if i TT the 2 sockets i will have to fit rcd's, which may be prone to nuisance tripping, i don't really know whats going to be plugged into it and the last thing they want on their wedding night is constant power outages.

Reading through Part 7 i don't think it applies here so is it acceptable to use the PME earth. I am proposing to fit a 100m/A s type rcd at the source.

This sort of job is a bit out of my comfort zone and i wouldn't normally do it but the guy is a friend.


Cheers Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 10 April 2013 10:12 PM
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slittle

Posts: 3459
Joined: 22 November 2007

Whenever we've done it on farms for their weddings, I've always made sure it's protected by a 30ma RCD.

Sometimes it's caused problems, but it's better than them remembering the wedding night for the wrong reasons

Stu
 10 April 2013 10:29 PM
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peteTLM

Posts: 3119
Joined: 31 March 2005

see what their own dist boards comprise of. If they contain 30ma devices, then id go with the 100ma front end and go straight into a commando for their connection. If they dont have any 30ma protection, id try and split up the end loads across as many rcbo's/ rcd's as possible.
Id be aware of the short term volt drop on volume spikes, lighting bursts etc, engineer a bit in when it comes to cable selection maybe.


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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry
 10 April 2013 11:26 PM
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John Peckham

Posts: 7375
Joined: 23 April 2005

Pete.

So not to keen then on compliance with 411.3.3 (ii)?

Gary

Provide the 32A sockets with 30mA RCD protection an TT the earthing.

I feel sure the company installing the temporary supplies will design. install and certify compliance with BS7909. Is that an Essex Old Spot that has just gone past my window?

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John Peckham

http://www.astutetechnicalservices.co.uk/
 11 April 2013 07:24 AM
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aligarjon

Posts: 2802
Joined: 09 September 2005

Are you upstairs john.

Thanks for the input guys.

At the end of the day i suppose i don't know how far away their Dis boards are going to be so i think it will have to be 30m/a rcbo's with the TT. I'll explain all and say make sure all their equipment has been tested properly.


Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 11 April 2013 08:03 AM
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dickllewellyn

Posts: 1150
Joined: 19 March 2010

I guess they usually use a generator? I can't imagine every marquee they install requiring the client to provide a supply?

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Richard (Dick)

"Insert words of wisdom and/or witty pun here"
 11 April 2013 06:43 PM
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aligarjon

Posts: 2802
Joined: 09 September 2005

That had crossed my mind Dick. i might suggest it. it may well be cheaper.

Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 11 April 2013 07:08 PM
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rocknroll

Posts: 8824
Joined: 03 October 2005

The majority of marquees where we make an appearance are powered by a lead from the house or nearby location, generally all the installers need is a 32A socket plug which then goes into their board which is RCD'd and from there 16A socket plugs and leads around the marquee, whether it is TN-S or TN-C-S they tend to use this earthing and sink a supplementary rod near the distribution unit, standalone TT which is not connected to bonding of some kind, water, gas etc; to lower the impedance can be quite dangerous, under fault conditions the system voltage can be present on the cpc for quite long periods.

The band power in marquees tends to quite low due to the environment, it does not do well for stereo and often a Crown XT 2000 with 2 top boxes and 4 subs in mono is adequate even for a 10 piece, depending on where you are in the marquee very often all the power is in vocals only.

Your the man, your choice!!!!

regards

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"Take nothing but a picture,
leave nothing but footprints!"
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"Oh! The drama of it all."
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"You can throw all the philosophy you like at the problem, but at the end of the day it's just basic electrical theory!"
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Edited: 11 April 2013 at 07:16 PM by rocknroll
 11 April 2013 07:22 PM
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aligarjon

Posts: 2802
Joined: 09 September 2005

Thanks RnR.

GARY

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Specialised Subject. The Bleedin Obvious. John Cleese
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