4mm spur

[redface]

dose anyone use 4mm tw/e now to supply sockets on 32a mcb as a spur if so what distance can you go in plastic 3 compartment trunking reference method c is 37A but methord B is 32A
now as there is only 1 cable in trunking. so i cant see why it drops 5A just to being inclosed in plastic

or dose everyone still use 2.5 ring circuits

 

[bigbaddave]

Many Spurs?

iS this homework BTW?

 

[DPG]

Think why the current capacity would be reduced if the cables is contained within something?? Daz

 

[redface]

no not home work i just put a 4mm tw/e spur of sockets about 70m in 3 compartment trunking on a 32A MCB and am just wondering if i need to make it a ring or weather you would or not it is only for a few computers and microscopes i could lower MCB i suppose .

 

[redface]

Think why the current capacity would be reduced if the cables is contained within something?? Daz

well there is loads of space in the trunking for the air to keep temp down

 

[MDJ]

Confused here, have you spurred the 4mm2 off a ring main? or from the DB as a radial circuit, speak English Man.

 

[Billythekid]

Confused here, have you spurred the 4mm2 off a ring main? or from the DB as a radial circuit, speak English Man.

Or fed his DB via a 4mm2 radial from his neighbours ring? :devilish:

 

[GLENNSPARK]

or is it a `hybrid` ?

 

[redface]

its a radial circuit from db

 

[redface]

sorry gents i just call radial a spur and its coming from db im **** on pc and hate typing so do everything short

 

[GLENNSPARK]

a radial...is ..well a radial...
a spur is a spur

 

[Guitarist]

no not home work i just put a 4mm tw/e spur of sockets about 70m in 3 compartment trunking on a 32A MCB and am just wondering if i need to make it a ring or weather you would or not it is only for a few computers and microscopes i could lower MCB i suppose .

So you have already carried out the work, but you're not exactly sure whether it is correct?
What calculations did you carry out regarding circuit loading, EFLI, voltdrop etc. ?

 

[Sintra]

So you have a 4mm radial supplying sockets on a 70M run protected by a 32A mcb. What is your calculated volt drop on this?

 

[Ducksy]

As the BGB says historically the floor area served has been limited to 75m "SQUARED".

The reason there is a 5a CCC between cables installed method C and B is due to the cable heat dissipation simple

EDIT So your NOT fine.

 

[MDJ]

a radial...is ..well a radial...
a spur is a spur

A saddle is a saddle and a horse shoe is a horse shoe lol