PFC

[m4tty]

Hi,

If you have a PFC above the 6ka that the MCB's can clear i have read somewhere that this is covered by the main fuse. I cant see it really and think the MCB's need to be rated above the PFC.

Would just like some clarification cheers

Thanks in advance

 

[Andy™]

providing there is something in the circuit which can break max PFC, your OK. BS88 & BS1361 fuses usually cover any high PFC, although if its really high you may have to ensure its a BS88-2 (80KA) since some 1361s are only rated 16.5KA

 

[m4tty]

Hi Andy thanks for replying.

Just trying to understand this right. If a fault occured say 15ka fault nearest the breaker wouldnt it blow the breaker up before the BS1361/BS88 acted, if you can understand what I mean.

Thanks again for replying cheers

 

[Andy™]

it may do damage to the MCB (since they are only designed for 6KA), but if you have such a high fault current, the service fuse it going to melt very quickly.

and if your so worried about a 6KA breaker, how often have you came across a PFC over 1KA with a 3036?

 

[kme]

If the board is of a newer design, and conforms to EN60439-3 annex ZA, the BOARD is rated as M16, irrespective of the individual mcb`s

 

[musicspark]

If the board is of a newer design, and conforms to EN60439-3 annex ZA, the BOARD is rated as M16, irrespective of the individual mcb`s

M16????

Sorry, old chap, I'm not completely au fait yetBlushingBlushing.

 

[musicspark]

Also, with such a high fault current you may have to consider thermal withstand, when choosing your cable?

 

[Andy™]

M16????Sorry, old chap, I'm not completely au fait yetBlushingBlushing.

16KA

 

[musicspark]

thanks Andy

Hmmmmm,,,,,, why not K16 I wonder?

 

[musicspark]

If it were K9 would you use a sonic screwdriver?

 

[Andy™]

thanks AndyHmmmmm,,,,,, why not K16 I wonder?

M# has always been used to describe this. look at old 3871 types, often marked M6 etc.

 

[kme]

M16????Sorry, old chap, I'm not completely au fait yetBlushingBlushing.

Blushingsorry, my baddy:coat

 

[musicspark]

Blushingsorry, my baddy:coat

I thought M16 was an automatic rifle

 

[Apache]

I thought M16 was an automatic rifle

Nah - it's threaded rod..........

:coat