OK,
I was doing a job a couple of weeks ago in a very controlled premises.
Once complete, no certification was required, however, I needed to prove that there was still an acceptable earth fault loop impedance at the point of works.
No permit to open up the DB to do any works within the DB, no requirement for IR, or R1+R2, due to the nature of the works.
No neutral present at the point of test, it was a balanced 3ph load, so, only 3 phases & cpc present.
Incomer to the DB 30mA instantaneous 4 pole RCD.
Not supposed to trip off the power.
However, I need to do a circuit Zs @ the point of work.
Meter is a Fluke 1653B, not a cheap tester, but, it does a 3 wire non-tripping loop test.
I can't think of any way that I can configure the meter to do a 2 wire non-tripping loop test, conventionally, or unconventionally.
Now I CAN'T open up the DB to bypass anything, plus that would not be a true Zs.
I HAVE to do the Zs measurement before I leave site and record this.
I could not think of any way to do it, checked the meter instructions, could not see anything obvious, I was in a rush, I admit.
So I just used my Megger LTW425 2 wire non tripping loop tester to get a value.
Not before I hasten to ad I had tripped the RCD twice!
Client not happy, but, managed to talk them round, still no chance of opening the supply board though.
I can't see how to do what is basically a 2 wire non tripping earth loop test on a Fluke 165xx series tester.
Anyone have any ideas?
Before I go to Fluke with this?
I have thought about this a little, not too much because I used the LTW to get a reading, and have the reading needed now, but, it would be nice to know!
I was doing a job a couple of weeks ago in a very controlled premises.
Once complete, no certification was required, however, I needed to prove that there was still an acceptable earth fault loop impedance at the point of works.
No permit to open up the DB to do any works within the DB, no requirement for IR, or R1+R2, due to the nature of the works.
No neutral present at the point of test, it was a balanced 3ph load, so, only 3 phases & cpc present.
Incomer to the DB 30mA instantaneous 4 pole RCD.
Not supposed to trip off the power.
However, I need to do a circuit Zs @ the point of work.
Meter is a Fluke 1653B, not a cheap tester, but, it does a 3 wire non-tripping loop test.
I can't think of any way that I can configure the meter to do a 2 wire non-tripping loop test, conventionally, or unconventionally.
Now I CAN'T open up the DB to bypass anything, plus that would not be a true Zs.
I HAVE to do the Zs measurement before I leave site and record this.
I could not think of any way to do it, checked the meter instructions, could not see anything obvious, I was in a rush, I admit.
So I just used my Megger LTW425 2 wire non tripping loop tester to get a value.
Not before I hasten to ad I had tripped the RCD twice!
Client not happy, but, managed to talk them round, still no chance of opening the supply board though.
I can't see how to do what is basically a 2 wire non tripping earth loop test on a Fluke 165xx series tester.
Anyone have any ideas?
Before I go to Fluke with this?
I have thought about this a little, not too much because I used the LTW to get a reading, and have the reading needed now, but, it would be nice to know!