matt.leung
Well-known member
today i finished off some work for a client, and when it came to testing, oh boy what a head spinner it was..
hall socket, for safe isolation 2 MCB's had to be turned off... and it gave me a Zs of 129ohms
main Ze = 2.20 ohms
PFC = 110A.
at first it looked like a TNS, but now thinking that it is not, and that the house is earth via the gas and water pipes, as i could not trace the earthing back...all hidden behind boards....
also the client asked me to check some other circuits.....
Kitchen socket =
L to N = 247v
L to CPC = 139v
N to CPC = 103v
FCU =
L to N = 240v
L to CPC = 139v
N to CPC = 103v
cooker circuit was wired as a 2.5mm ring. - thank god it was a gas cooker
Zs = 2.07 ohms
voltage between the conductors all ok here this time...
out door socket =
Zs= 167 ohms
voltage between the conductors all ok here this time...
RCD trip times all ok.
dimmer switch in the kitchen... this makes no sense to me at all.....headbangheadbangheadbang
ON OFF
Cable to light
L - N 13v 247v
L - CPC 54v 126v
N - CPC 50v 83v
Supply to switch
L- N 9v 240v
L - CPC 51v 95v
N - CPC 55v 127v
can you please help me, and understand all these results..... :C :C:C
hall socket, for safe isolation 2 MCB's had to be turned off... and it gave me a Zs of 129ohms
main Ze = 2.20 ohms
PFC = 110A.
at first it looked like a TNS, but now thinking that it is not, and that the house is earth via the gas and water pipes, as i could not trace the earthing back...all hidden behind boards....
also the client asked me to check some other circuits.....
Kitchen socket =
L to N = 247v
L to CPC = 139v
N to CPC = 103v
FCU =
L to N = 240v
L to CPC = 139v
N to CPC = 103v
cooker circuit was wired as a 2.5mm ring. - thank god it was a gas cooker
Zs = 2.07 ohms
voltage between the conductors all ok here this time...
out door socket =
Zs= 167 ohms
voltage between the conductors all ok here this time...
RCD trip times all ok.
dimmer switch in the kitchen... this makes no sense to me at all.....headbangheadbangheadbang
ON OFF
Cable to light
L - N 13v 247v
L - CPC 54v 126v
N - CPC 50v 83v
Supply to switch
L- N 9v 240v
L - CPC 51v 95v
N - CPC 55v 127v
can you please help me, and understand all these results..... :C :C:C