Neutral Earth Loop Impedance Testing.

Thanks for that Mike,

                                      that is very useful information. The device does have a facility to break into the N-E and E-E part of the test circuit. There are terminals on the front panel with removable banana plugs. The instructions state that it is possible to test the resistance of a conductor (presumably earth in most cases) with a 16 Amp. 40 Volt supply. Two green leads are supplied with croc. clips on the far ends.


I have serviced the tester and it works well. It is just so well made with 60s/70s electronics and a very heavy transformer. The thermal safety cut-outs are short lengths of 18 s.w.g. 60/40 tin/lead solder, a spare length is supplied inside the case. The innards also contain some very beefy resistors. All inside a solid wooden box.


I could never afford Clare equipment when younger, so it is a privilege to own a piece, albeit elderly, now.


A little chart inside the box lid cover states "Fuse ratings for compliance with I.E.E. Reg E5."


A 60 Amp fuse required a L-E loop impedance of 1.3 Ohms max. (for a 100 Amp. M.C.B. 1.0 Ohms max.)


A 30 Amp fuse required a L-E. loop impedance of 2.6 Ohms max. 


Bye,


Z.

Thanks for that Mike,

                                      that is very useful information. The device does have a facility to break into the N-E and E-E part of the test circuit. There are terminals on the front panel with removable banana plugs. The instructions state that it is possible to test the resistance of a conductor (presumably earth in most cases) with a 16 Amp. 40 Volt supply. Two green leads are supplied with croc. clips on the far ends.


I have serviced the tester and it works well. It is just so well made with 60s/70s electronics and a very heavy transformer. The thermal safety cut-outs are short lengths of 18 s.w.g. 60/40 tin/lead solder, a spare length is supplied inside the case. The innards also contain some very beefy resistors. All inside a solid wooden box.


I could never afford Clare equipment when younger, so it is a privilege to own a piece, albeit elderly, now.


A little chart inside the box lid cover states "Fuse ratings for compliance with I.E.E. Reg E5."


A 60 Amp fuse required a L-E loop impedance of 1.3 Ohms max. (for a 100 Amp. M.C.B. 1.0 Ohms max.)


A 30 Amp fuse required a L-E. loop impedance of 2.6 Ohms max. 


Bye,


Z.