Just checking my understanding of min c.p.c csa?

[MickSmith5824]

Hello all

Just checking my understanding of min cpc sizing. If installing 20Amp 2.5mm TP&N circuit using armouring as c.p.c. Is 2.5mm from bango minimum c.p.c. Table 54.7 seems to suggest so? Cheers

 

[buzzlightyear]

Just checking my understanding of min cpc sizing. If installing 20Amp 2.5mm TP&N circuit using armouring as c.p.c. Is 2.5mm from bango minimum c.p.c. Table 54.7 seems to suggest so? Cheers

what are you trying to achieve ?

 

[MickSmith5824]

what are you trying to achieve ?

Just complying with regs and also that my understanding of them is correct. I know this isn't great example have used but just wanted to check that even if 3 phase circuit if I comply with table 54.7 I won't go wrong. I know adiabatic equation can be used in certain circumstances as well though. I think this would be when trying to achieve more definite disconnection times and/or possibly saving on using unnecessarily large cable sizing?

 

[buzzlightyear]

I know this isn't great example have used but just wanted to check that even if 3 phase circuit if I comply with table 54.7 I won't go wrong. I know adiabatic equation can be used in certain circumstances as well though

by using the table then the adiabatic calculation is achieved .

 

[davesparks]

Just complying with regs and also that my understanding of them is correct. I know this isn't great example have used but just wanted to check that even if 3 phase circuit if I comply with table 54.7 I won't go wrong. I know adiabatic equation can be used in certain circumstances as well though. I think this would be when trying to achieve more definite disconnection times and/or possibly saving on using unnecessarily large cable sizing?

The adiabatic equation can be used in all circumstances.
Yes if you comply with that table your cpc will be the correct size.

 

[buzzlightyear]

Use SWA as CPC, a guide to the acceptability of steel wire armour use as CPC. - https://gadsolutions.biz/regulations/swa-as-the-cpc ,three words.

 

[MickSmith5824]

by using the table then the adiabatic calculation is achieved .

The adiabatic equation can be used in all circumstances.
Yes if you comply with that table your cpc will be the correct size.

Cheers chaps thanks for the clarification