Convector heaters

[GK Electrical]

hi
I have to fitt 6 x 2kW convector heaters in some place 45m from main fuse boar.
What is the better/ right solution?
1. run 2,5mm cable from each of them to the main fuse board and protect it with 20A mcb
2. run thick cable (what size?) from the main fuse board somewhere closer to the heaters and put there small fuse box where i will connect the heaters in?
Thank you in advance for your help..

 

[Knobhead]

What works out cheapest? 45M of 10mm + CU or 270M of 2.5mm. which is easiest to run? To be honest I’d go for the sub board. But at the end of the day it’s your job, only you can make the decision.

 

[GK Electrical]

only question is that: wont the 2.5 over heat on this 45m? according to the book it shuld be all right up to 50m? its easier and cheaper to run 6 x 2.5mm. what you think?

 

[malcolmsanford]

hi
I have to fitt 6 x 2kW convector heaters in some place 45m from main fuse boar.
What is the better/ right solution?
1. run 2,5mm cable from each of them to the main fuse board and protect it with 20A mcb
2. run thick cable (what size?) from the main fuse board somewhere closer to the heaters and put there small fuse box where i will connect the heaters in?
Thank you in advance for your help..

1 Have you got 6 spare ways in this existing DB
2 If you use 6 ways up will there be any left for any future work
3 Are you using singles or multicore cable
4 If singles what are you running the cables in
5 What type of installation is this commercial/industrial

The answers to above questions will help us to give you the correct advice

 

[GK Electrical]

1 Have you got 6 spare ways in this existing DB
2 If you use 6 ways up will there be any left for any future work
3 Are you using singles or multicore cable
4 If singles what are you running the cables in
5 What type of installation is this commercial/industrial

1. I do have spare 6 ways
2. Yes it will
3. Im using 2.5mm twin and earth run in the floor without any insulation and then half way clip on.
5. It is 3 phase commercial instalation (car showroom)

Thank you in advance for your help.

 

[malcolmsanford]

1 Have you got 6 spare ways in this existing DB
2 If you use 6 ways up will there be any left for any future work
3 Are you using singles or multicore cable
4 If singles what are you running the cables in
5 What type of installation is this commercial/industrial

1. I do have spare 6 ways
2. Yes it will
3. Im using 2.5mm twin and earth run in the floor without any insulation and then half way clip on.
5. It is 3 phase commercial instalation (car showroom)

Thank you in advance for your help.

There is nothing wrong in your design method really, your cable calcs for current carrying capacity and VD seem good, you have enough spare ways and enough over for any future work.

Doing it your way would certainly be cheaper than running out a 3 phase supply to a local DB and then from that DB to the heaters, and cost is always an over riding concern.

 

[i=p/u]

would he have too run 3 phase cause origin is 3 phase...

can you not run a single phase off a 3 phase board???? <<<<<L>>>>>>>

 

[malcolmsanford]

Yes I=p/u but if you just run a single phase distribution circuit to a new DB then you will have 12kw of heaters on a single phase and could have out of balance phases, which is something you don't really want if you can help it.

Most guys would run a 3 phase distribution circuit to a small 3 P+N+E DB and have 6 heaters spread over the 3 phases, which I'm sure GK was going to do with his 6 separate final circuits back to the original DB

 

[i=p/u]

aaaaa, theres always something i forget about.. info overload

 

[GK Electrical]

Thank you for the advice guys.