Hi,
When proving supply and polarity at a three phase cut out on a new supply with test lamps
L1 - N is 230V L2 - N is 230V L3 - N is 230V
L1 - L2 is 400V L1 - L3 is 400V
So far so good. But here's the problem:
L2 - L3 is NO LIGHT!!!
The only thing I can think of is that L2 is fed from L3. Maybe two phases fed from one by incorrect termination at cut out.
Anyway, I just thought I'd ask it on here and see if any of you wise people agree!!! Or know of any alternative reasons.
This is for a exam question and any help would be greatly appreciated as I have no one else to ask and it's very hard to find answer on internet so far.
Thanks,
Rob
When proving supply and polarity at a three phase cut out on a new supply with test lamps
L1 - N is 230V L2 - N is 230V L3 - N is 230V
L1 - L2 is 400V L1 - L3 is 400V
So far so good. But here's the problem:
L2 - L3 is NO LIGHT!!!
The only thing I can think of is that L2 is fed from L3. Maybe two phases fed from one by incorrect termination at cut out.
Anyway, I just thought I'd ask it on here and see if any of you wise people agree!!! Or know of any alternative reasons.
This is for a exam question and any help would be greatly appreciated as I have no one else to ask and it's very hard to find answer on internet so far.
Thanks,
Rob