High PSCC and strange readings - help much appreciated Discussion ThreadHigh PSCC and strange readings - help much appreciated Electrical Advice
Hey hows it going,
So was doing two different EICR the other week. Two different locations, same issue and I’m not sure what the best course of action is. Both constructed in 2016, 100% new. Hager metal dbs. TN-C-S (PME)
So for example on one:
Original test sheet Zdb - 0.21ohms, 1.18 kA
(No Ze on teat sheet)
My tests
2 lead test
Ze at Db (earth disconnected) - 0.06ohms, 3.62
Zdb (earth connected) - 0.06, 3.73kA
Now the problem
L-N - 0.01, 20kA
So that would give me a final recordable value of 20kA of a prospective fault current.
Anybody have any ideas on why the reading could be so massive and how to lower it? As it’s not suitable for the 6kA rated MCB’s.
Was looking at regulation 435.5.1, looks like the MCB braking capacity can be ignored if protected by an another protective device that is suitable. The supply fuse is at least 1361 type 2 that has a 33kA breaking. So it might be ok if Im reading it right.
Im using a megger mft 1721,just calibrated three weeks ago. cant null the leads on the these tests, possibly out of range of the tester value. Have not had any issues with other properties.
Any help or info is much appreciated.
Thanks
High PSCC and strange readings - help much appreciated for the original thread on Electricians Forums
Hey hows it going,
So was doing two different EICR the other week. Two different locations, same issue and I’m not sure what the best course of action is. Both constructed in 2016, 100% new. Hager metal dbs. TN-C-S (PME)
So for example on one:
Original test sheet Zdb - 0.21ohms, 1.18 kA
(No Ze on teat sheet)
My tests
2 lead test
Ze at Db (earth disconnected) - 0.06ohms, 3.62
Zdb (earth connected) - 0.06, 3.73kA
Now the problem
L-N - 0.01, 20kA
So that would give me a final recordable value of 20kA of a prospective fault current.
Anybody have any ideas on why the reading could be so massive and how to lower it? As it’s not suitable for the 6kA rated MCB’s.
Was looking at regulation 435.5.1, looks like the MCB braking capacity can be ignored if protected by an another protective device that is suitable. The supply fuse is at least 1361 type 2 that has a 33kA breaking. So it might be ok if Im reading it right.
Im using a megger mft 1721,just calibrated three weeks ago. cant null the leads on the these tests, possibly out of range of the tester value. Have not had any issues with other properties.
Any help or info is much appreciated.
Thanks
High PSCC and strange readings - help much appreciated for the original thread on Electricians Forums
