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Posted By Topic: power point circuits

jimmy
Jan 08 2018 12:31

I have a customer who wants a new power point circuit with 5 points.Is it still ok to have all 5 on one circuit wired in 2.5?
Also have been told that 10a mcb/rcd protection is not permitted for power circuits wired in 2.5-must be 15a min
any thoughts
   

SparkyJoe
Jan 08 2018 16:32

16/20 amp depending on installation method. And as many outlets as you like.
   

gregmcc
Jan 08 2018 16:52

Do your calculations for distance to see if 2.5 will handle the loading and be less than the maximum volt drop
   

DougP
Jan 08 2018 18:04

It's not "as many as you like" - there are limitations.
   

DougP
Jan 08 2018 18:06

Table C8 is where you will find that socket outlets are "not permitted" on a circuit with less than 13A MCB.
   

Mitchellct
Jan 08 2018 20:16

Appendix C is an informative section not normative so therefore a good idea but not a 'rule'.
   

mowgli
Jan 08 2018 20:23

Mitchellct is correct. Appendix C is informative.

The rule infringed would be 2.5.3.1 and specifically equation 2.1. This requires the nominal current of the protective device to be greater than the maximum demand of the circuit it protects.
   

mowgli
Jan 08 2018 20:24

That should have been "greater than or equal to"
   

mowgli
Jan 08 2018 20:34

Except I'm wrong. Maximum demand may also be determined by limitation ie. by the MCB. So really it comes down to designing a reliable installation that won't trip unnecessarily under expected loads.
   

mf51to1
Jan 08 2018 22:19

[quote][Also have been told that 10a mcb/rcd protection is not permitted for power circuits wired in 2.5-must be 15a min
any thoughts/quote]

Oh dear.
   

pluto
Jan 09 2018 06:34

mf51to1 Jan 08 2018 22:19

your comment
[quote][Also have been told that 10a mcb/rcd protection is not permitted for power circuits wired in 2.5-must be 15a min
any thoughts/quote]

My comment
I know of NO requirement that the use of a 10 A overcurrent protection on 2.5 mm2 cable is not permitted.

If may however, fail "fit for purpose" maximum demand, voltdrop requirements if a 16 A overcurrent protection device was used.