A caravan site needs 36 mains electricity hook up points (230Vac double points on weather proof posts). All points must be capable of supplying a minimum of 20 amps. The supply head to the site is capable of giving all the demands set. Discrimination is allowed. All points must comply with current IEE and CTEC standards.
How would I go about this installation?
My apologies. Each hook up point needs to supply a minimum of 30 amps. I need new glasses, or a better brain. :-)
Eh, I thought caravans used the 16A flavour of IEC309 connector? Or does each point serve multiple caravans?
Figure 7 and the "Special Locations" section of this probably fall into the grannies+eggs category
Double points, with discrimination allowed. Each point must be capable of a supply at 30 amps. That's 60 amps or more at each hook up. This is not a touring van site installation. That's to easy. :-)
My apologies again. These are double points to supply a minimum of 32 amps to each point. That's 16 amp hook ups like you said, Andy. Further reading of the proposal says at the end "To allow the supply of services to touring campers and caravan users."
My worries are over. Forget the poser that was set earlier. :-) LOL
14 pages of wording that say one thing and mean another. Cheezo!!!
Its not a poser, it is not a d-i-y job, it is a job for an electrical contractor. The wiring matters article is probably no longer relevant because caravan parks were changed in the 17th edition. You need to get someone in to do this work for you because caravan parks can drive an awful lot of power.
Regards
Steve Dawson (currently working on caravan park upgrades!)
BigWallop coughed up some electrons that declared:
I'm not sure you're permitted to put a 16A commando socket on anything more than a 16A protected circuit. Normally it's one socket to one breaker if they are expected to be hooked up most/all of the time.
I would have thought (and this is outside of my area) that you'd either have a lot of 16A radial circuits going back to base, or run a fairly heavy distribution circuit to each group of pitches and use a local distribution board to fan out.
The earthing provisions for this sort of setup are well beyond me, but it is a safe bet that they will be specific and onerous.
It's an exam question isn;t it?
Cheers
Tim
From recent postings I believe Mr Wallop is a sparks, but is more(?) familiar with working on the other side of the meter.
Fair enough.
So you are presumably in a good position to direct the O/P to the relevant sections of the 17th ed. OSG?
From section 708 of Guide to the Wiring Regulations:
17th Edition IEE Wiring Regulations (BS 7671: 2008)"Caravan and camping parks (708) The main modification for the 17th Edition is that pitch socket-outlets are to be individually protected by a 30 mA RCD."
A single individual 20A underground to every post from a single RCD or MCB.
And a 3 phase supply? and a BIG consumer uniit?
My guess would be (And I have never done anything like this before!)....
3 phase supply into site I assume?I would imagine you would subdivide each of the main three phases into 5 sub mains, and use 4 each of these sub-mains to feed the posts (So there is a spare sub-main on each phase for other things on the site.
Each sub-main is protected by a 100A fuse and 100mA time delay RCD.
Then one of each phase is taken to one of 4 distribution points feeding 9 posts (So this DP has 9 x 32A MCB's in)
Then in each post, it has 2 x 16A RCBO's, so the user can reset their own tripped breaker!
This way, if they need a three phase hook-up installed later, you already have three phase at the DP's
No idea on earthing, but as I would assume the water will be supplied in plastic, I would assume bonding to this would not be necessary?
You might also want to run another circuit to each DP, for sight lighting, maybe even CAT5e for future WiFi access points, telephones, TV distribution, or better control of the site lighting
I suppose you could put DECT base stations in each hook-up, then the phone and charger can be rented from the site. (If there is good mobile coverage, this probably wouldn't be that popular though!) All they would need would be a hotel style PBX
As I said before, I have never even thought about this before now, let alone done it, so please don't take any of it as advice!
Toby..
What exactly is the requirement "discrimination is allowed"?
I could understand a requirement that discrimination is *required* or diversity is allowed...
No specification on the material used. If we think something is best for the particular situation, we are allowed to use it without consultation or change to previous agreement. Discrimination is allowed. I'm surprised you haven't had that on a works proposal before.
Diversity is not allowed on the specific requirement of the job. The site has to have a minimum supply voltage and current rating to each point, whether it's use, half used or not used at all. Therefore, diversity is not to be discriminated. :-)
Do you mean diversity?
I would suggest using a ring circuit in hefty SWA (but less hefty because it's a ring) per section of the site - 12 points per ring and
3 rings would balance across phases. 30mA 2x16A (or whatever) RCBO at each point or pair of points. Maybe a 100mA RCD on each ring. Much as what Toby said but rings instead of radials to reduce the number of circuits, conductor size and volts drop. The main conundrum would be conductor size and terminal current-carrying capacity of the sockets (in the same way that a 13A socket terminals has to carry 32A on the continuity of the ring).Re the water, my local station has small stanchions along the platform, with 16A sockets and an adjacent water connection, for use by the overnight train cleaning crews. AFAICS the water taps use some form of bayonet hose connection with what looks like a (gas) lever- valve. The sockets are in IP rated enclosures with flip-up lids and the taps have long nozzles which would squirt well away from the sockets. So it's certainly do-able.
Owain
I would start with high security locking wheel nuts for my van.
Adam
LOL !!! Never thought of that one. A visit to Halfords before a visit to site, it is then. :-)
So is it a gypsy camp you are wanting to wire up? I have worked on a few.
Usually it is an armoured supply to the posts, with one weatherproof post supplying two vans. The post consists of a TT supply from the armoured cable and a waterproof box containing a CU with a 30mA RCD main switch and two 16A MCBs and two electric meters.
Adam
Ah, ok I was thinking of the technical meaning of the word - i.e. containing trips to the locale of the fault etc.
Many of the contracts I see seem to like the American style phrase "it shall be x, 'or equal'".
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