Proposed Caravan Site

[chrish_1977]

I know, before anyone asks Im thinking the same.

Anyway, I have been asked by a customer (on the phone) how much to convert an old farm building into a caravan site for approx 14 pitches, from what i have gathered there is a TT supply feeding a 100A fuse from the DNO. I have yet to see this install yet, asked the customer to email me some pics as this is up north from me, and want to see if its worth my while to start with.

I digress, sorry. Am I right in thinking that they may have to upgrade to a 3 phase supply to allow for the pitches and main building (which has about 5 individual C/U within the property). Or could I get away (bad term im sorry) with just derateing everything to 80A?

I'm just picking brains until I get the pictures from him.

Many thanks in advance

Chris

 

[pushrod]

This is the wrong calculation you are using here. The last caravan on this radial cable will only be drawing 10A, ...Not 160A!! You need to calculate VD at each pitch then add the total, to get an accurate value. Same as if you were calculating the VD/cable size for a string of street lights....

Agree and in addition even at the start of the run where you would have the max current, the 16mm² you (the OP) mentioned would be no where near big enough to cope with the 160A - probs looking at 50mm² which would then almost certainly cope with Vd if calculated properly. Unless of course i have read OP's post wrong and need to go to specsavers lol.

 

[Engineer54]

Agree and in addition even at the start of the run where you would have the max current, the 16mm² you (the OP) mentioned would be no where near big enough to cope with the 160A - probs looking at 50mm² which would then almost certainly cope with Vd if calculated properly. Unless of course i have read OP's post wrong and need to go to specsavers lol.

I didn't make any comment on any cable sizing, as i don't think the OP knows too much about the proposed requirements of the installation at this time.

He will probably need a 3 phase supply for the house and the caravan site, plus the caravan site will also probably need some area lighting too. ...Lots for him to assess before he decides on an overall design!!

 

[Bornagainsparky]

Fully understand where you are coming from and all other responses are valid and appreciated. Taking the point of 10 amps being available at the last caravan proves to me that the cable feeding is inadequate, more so if all units are being used at the same time which is entirely possible and I guess this should have been accounted for by the original designer, so the options, to my mind are: increase the size of cable, construct a ring circuit as stated by Malcolmsandford or reduce the number of vans on each circuit, all of which are costly to the operator and I think we all know what their response would be but my personal view is that this installation is not adequate enough, in it's current form, for the potential demands or is this how caravan sites are designed, based on this I wonder how other subscribers would view it

Thanks