3 phase testing

[searley]

i am doing my 2391 practicle shortley and never done 3 phase testing before. can any one tell me the write way of testing 3 phase from start to finish.ie l1 to l2 l1 to l3 and so on just to make sure i have got it write.cheers men !!!!

 

[Apache]

cheers men !!!!

There is at least 1 lady online!

Wet Fish

 

[batty]

With you tester you put the l1 lead on l1 l2 on l2 and l3 on l3 if it wired corrcetly it wil be correct on display. I have a di-log 9073 for phase testing which goes in right sequence if I remember correctly. Best bet is to read instructions for tester. I don't think I have helped much here.

 

[searley]

thanks diged the books back out just trying to take it all in.cheers

 

[green-hornet]

From start to finish?

Thats a lot of testing.

Its not really complicated, just because you have three "lives".

Try to think as each phase as a seperate line in, and then multiply your testing by 3.

The main problem with 3 phase is to get a good balance, so each phase in an ideal world will draw the same amps.

 

[Andy™]

With you tester you put the l1 lead on l1 l2 on l2 and l3 on l3 if it wired corrcetly it wil be correct on display. I have a di-log 9073 for phase testing which goes in right sequence if I remember correctly. Best bet is to read instructions for tester. I don't think I have helped much here.

you also need to check phase sequence (612.12), not just rotation

 

[kme]

The main problem with 3 phase is to get a good balance, so each phase in an ideal world will draw the same amps.

As per Tuesday`s job (and Weds, Thu & prob. Fri.......)

Public house, with rented flat above. Huge commercial kitchen. 3Ph, 4 wire, 60A/phase incomer. All dist boards SP, from henley blocks, in tails ranging from 25mm to 6mm:_|

No means of isolating whole installation.

I`m removing 5 scabarous old 3036 boards, and replacing with a 12 way, TPN. 12 other SP boards scattered around the premises. Not one RCD to be found, anywhere.

When I went to assess, they`d recently had the L1 service fuse replaced.

I did two load measurements, 1 hour apart:

1st test: L1-56A L2-6.8A L3-27A

2nd test: L1-79A L2-7.3A L3-41A

Think it may be a little unbalanced. Told the owner that balancing the supplies will pay for itself in electric within 6 months or so (currently paying

 

[Andy™]

how will balancing reduce the total power used and therefore leccy bill?