wiring caravan hookups

[vitoboy]

hi all
just been asked to do 5 caravan hookups for a local park just starting.
just wanted to pick you guys brains
would you generally run one cable per hook up or put them all on one radial circuit with each one feeding the next.
ive a total run of about 80m so its either 5 x 1.5mm armour or 1x 16mm armour then 10mm then 6mm ect.

ta all

vitoboy

 

[Adam W]

... Or you could do a ring circuit. Cable size would depend on volt drop, what size cable you can get into the hookups etc. I'd use the same size cable throughout.

 

[davelerave]

yes- i'd be thinking 'ring main' anyhow if possible

 

[IQ Electrical]

hi all
just been asked to do 5 caravan hookups for a local park just starting.
just wanted to pick you guys brains
would you generally run one cable per hook up or put them all on one radial circuit with each one feeding the next.
ive a total run of about 80m so its either 5 x 1.5mm armour or 1x 16mm armour then 10mm then 6mm ect.

ta all

vitoboy

As Adam says, the limiting factor is volt drop-what is the earthing system ie. are you extending a TN-S earth or creating 1 main or 5 local TT systems?

 

[telectrix]

I thought caravan hook ups had to be TT.

 

[vitoboy]

i was thinking of each hookup being its own tt system.
the layout isnt giving much advantage to a ring main layout...but this could still be the easyest way to do things.
the hookups are just one part..iva 300m run to geta submain to a shower block then from there out to the van sites,
all in all a very long way.

 

[IQ Electrical]

I thought caravan hook ups had to be TT.

No, you can use TN-S or TT to the pitches, the reg's only preclude a PEN conductor to pitch supplies.

 

[telectrix]

thanks, IQ. Volt Drop is the biggest problem, assuming a 10Asupply each point an 80m run would be hard put in 6mm. just for 1 point.( around 12.5V at a guess)

 

[IQ Electrical]

i was thinking of each hookup being its own tt system.
the layout isnt giving much advantage to a ring main layout...but this could still be the easyest way to do things.
the hookups are just one part..iva 300m run to geta submain to a shower block then from there out to the van sites,
all in all a very long way.

At 300M plus 80M on the caravan run, you'll be looking at some nasty CSA to overcome volt drop!

 

[telectrix]

yep. with showers off the sub-main as well. mortgage job

 

[vitoboy]

hell yeh...the 300 meter run will have a max load of about 230A when all is complete.this is alot!

 

[IQ Electrical]

hell yeh...the 300 meter run will have a max load of about 230A when all is complete.this is alot!

Well let us know what you end up using!

 

[vitoboy]

i was thinking it would be 10mm but after a quick look the ring curcuit would be 140m long even for a 40A ring curcuit im looking at 24v volt drop..so ill need 16mm...bugger.
voltdrop does scew things up over these distances..
any ideas welcome..

 

[malcolmsanford]

As it is 5 units run a sub main to a central point and install another DB. Say a 63amp SWA to feed the board, and then 5 septate RCBO's for each caravan pitch and run say a 2.5/4mm cables to each socket for each pitch, which ever size cable is suitable for the load.

You could even feed the shower unit, from this DB board as it may be closer than your original plan.

Also what earthing system have you

 

[telectrix]

for the sub main at 230A you're looking at 400mmsq. cable. unless my calcs. are wrong. sheesh