PFC on EIC

[Mark2spark]

Hi Guys, just a 'just wondering' type of question.

When you fill out an EIC, on the PFC bit, what do you put down?

I always use ohms law using the Ze and put down 0.6kA or whatever.

Trainee I am seeing again tomorrow appears to be saying that he's been taught at college to *always* put '6' down, as in 6 kA :shakehead

Hmmm...

 

[chris_k]

6ka???

Just put down the highest measured value PSCC or PEFC

 

[Mark2spark]

Yeah, 6kA.

Glad it's not just me then

How can there be a difference on the 230v supply, of PSCC or PFC then Chris?

(not worded that very well but it's late, sorry)

Mark

 

[chris_k]

PSCC is taken L-N, PEFC is taken L-E, With all bonds connected.

On a TNCS/PME they should be around the same as earth is connected to neutral in the supply head. On TNS, PEFC will usually be lower than PSCC as the earth has a higher resistance. On TT the PEFC will be substantially lower than PSCC as the earth has a higher resistance still.

Been down the pub so that probably doesnt read that well either!!

 

[Mark2spark]

No that makes perfect sense Chris, thanks for the reply. I didn't think of TN-S systems, I pretty much only do stuff on PME so there's no difference on the 'Nature of Supply Parameters' obviously as N & E are the same thing.

 

[steptoe]

No that makes perfect sense Chris, thanks for the reply. I didn't think of TN-S systems, I pretty much only do stuff on PME so there's no difference on the 'Nature of Supply Parameters' obviously as N & E are the same thing.

are you sure you dont mean TN-C-S ? ]

 

[sellers]

Highest measured, and double for 3phase.

 

[Mark2spark]

are you sure you dont mean TN-C-S ? ]

Yes :innocent

---------- Post Auto-Merged at 22:02 ---------- Previous post was made at 22:01 ----------

Further to my OP:

Well I've cleared it up, trainee was confused, the '6' that is always put down refers to the 6kA limit on breakers :slap