Campsite Electric Hook-up connection

[Engineer54]

i,m just wondering how to calc. volt drop on an install like this. assuming 1 or 2 radial circuits, the load is taken at varying points, i.e. the load at the end of a run is not the total load. (only 10A if each van has a 10A supply) so would you use 10A for the full cable length, and calculate say at 50% of the length at say 30A ( allowing na bit of diversity)

On a radial circuit, your biggest loading is at the first point, 9 x caravans at 10a =90A. Second Point 8 x 10A =80A , and so on. To conduct a diversity exercise you will need some experience of such caravan installations, which i'm sorry to say i don't have. Maybe someone here on the forum, will be able to help on that score for you....

The volt drop calculation is similar to those or a row of lights so distance x load at each point along the circuit then combine the totals

 

[telectrix]

as a rule of thumb, i would apply 50% diversity, as i can't imagine average load for 9 caravans > 5A average at any one time. that's mt guesstimate. someone might prove me wrong. it's something i've not come across before, except one site where 4 caravan pitches were taken from the car park lighting which was on a 10A MCB. he wanted me to sort out the"nuisance tripping" of the MCB. FFS.

 

[grantr37]

The farmer will have loads of rolls of the ducting needed to bury the cable in, so wont need to buy more, its something pretty much all farmers keep a large stock of, and he will probably have his own digger as well, so he will be able to sort out any trenches that need digging....

 

[Mikehull]

Just wondering doesn't each socket outlet at the caravan pitch need individual overcurrent protection? so would not be able to do it in a ring or radial?

 

[thekingiam]

Just wondering doesn't each socket outlet at the caravan pitch need individual overcurrent protection? so would not be able to do it in a ring or radial?

Correct me if ime wrong but I thought the discussion was ring or radials feeding a rcd,mcb connection points to each pitch with maybe metering included? That's what I thought would be required? Although as you say hasn't been mentioned.

 

[Engineer54]

Just wondering doesn't each socket outlet at the caravan pitch need individual overcurrent protection? so would not be able to do it in a ring or radial?

How do you know if these Caravan supply units don't incorporate an MCB, as well as the RCD?? Personally i don't know, but i would assume that they will!!! Maybe a DP RCBO even....lol!!!

 

[Mikehull]

Just checked over the regs i think i read it wrong i thought it meant each socket had to be on a seperate circuit/cable. my bad lol.

 

[thekingiam]

I would like some bright spark to explain the volt drop equation for me in this circumstance, basicly if each point is rcd,mcb etc protected then isn't it just a bunch of sub mains connected together?

 

[Engineer54]

Yep, something like a rising main in a high rise building, but on a smaller scale ...lol!!!

 

[thekingiam]

Yep, something like a rising main in a high rise building, but on a smaller scale ...lol!!!

Or a ring mains with everything using 13amps at every socket, but on a bigger scale!

Trippy!!!