C&G 2391

[Spark123]

You maybe need to be a member to be able to view the documents?? I have sent you an email address for rocknroll who set the site up.

 

[BUNGKAN]

I have tried everything (inc password) to join Sparky Heaven, without success. Would it be possible for someone to send me any C&G 2391 past papers. I sit mine in July, I'm really desperate

 

[festa]

one or 2 questions i was not 100 sure of..

1. for a T-N-S system, calculate the maximum permisable Zs of a 30mA rcd.. ( no other info given.. )

i worked it out ( after an epiphany at 1:50.. good job I sat there... ) that it was 50/30mA = 1666 ohms... this sounds high for me but is ok to the regs for dry locations on TT systems..
can't find the formula for T-N-S systems though.

Your right om the 1666 ohms but some say `but no more than 200 ohms`
Whether its a T.T, TNC-S or a TNS the max Zs is the same, so for C&G to mention TNS system their just trying to be foxy!!!

 

[ColJack]

FYI, i had my results a few weeks back and passed..

 

[ricicle]

Congratulations

 

[Spark123]

Yeah, well done!!