install query

[matt12321]

im installing a pump which is roughly 750w. what im looking to do is to spur off an existing single socket, which is on its own circuit, which is fed by a 20a re-wireable fuse. then running 2.5mm from the single socket across a distance of 65m through the rafters of a barn to a junction box where i will the run swa down the barn then underground to the pump housing with a ip rated single socket in, which i can then plug the pump in to.

is there anything im missing and is this ok?

thanks

 

[DurhamSparky]

sounds ok but maybe install an RCD Fused Spur at the starting point of cable run to give you that bit protection at the New socket

Based on 65m Run

Required Cable Size 1.5 mm
Voltage Drop 5.72 Volts.
Percentage Drop 2.5%
Current Load 3.00 Amps
Max Cable Load* 23.0 Amps

 

[benji]

I think you need o/l protection above 360w

yours benji

 

[matt12321]

I think you need o/l protection above 360w

yours benji

so will i have to replace the re-wireable db board and put a new one in with rcbo's

 

[DurhamSparky]

NO!!! install a Fused RCD Spur Unit next to your socket your spuring from and run supply through this!!

fit it with a 3/5 amp fuse and Bingo Overload protection suitable to equiptment and RCD in one!!
Powerbreaker 13A RCD FCU - Screwfix.com, Where the Trade Buys

 

[ezzzekiel]

or run through a inline rcd further upstream although durhams rcd spur is a simpler idea (personally they are ugly looking things so depends wether cosmetics are a issue or not)

 

[DurhamSparky]

Volex 13A RCD FCU - Screwfix.com, Where the Trade Buys

this one looks even worse!!

 

[matt12321]

oh yeh

nice one. its going be difficult fitting before the socket i want to spur off tho. oh well another challenge

 

[DurhamSparky]

fit it after the socket!!!!! socket ---->> RCD Spur ----->> new socket (but fit it at the beginning of your cable run !!)

 

[matt12321]

cheers buddy

thanks for that. much appreciated

 

[DurhamSparky]

sorry for making it sound like im teaching you to suck eggs!!

 

[ezzzekiel]

fit an rcd next to db and run circuit through it will make life easier, look tidier and cost about the same

 

[matt12321]

sorry for making it sound like im teaching you to suck eggs!!

i wouldnt be on here if i didnt want people giving me advice. id rather sound stupid and pick up small things like that lol. all part of learning mate