Hi.
Just a question from a slightly confused trainee about core colours on a three phase appliance.
I was diagnosing a fault on a three-phase saw today (found it - dead isolating transformer) and found that the incoming cable (4 cores) were coloured and connected as such:
L1 Brown
L2 Black
L3 Blue
E Green/Yellow
I didn't look at the saw motor itself but made the assumption that it did not need a neutral (N terminal at the contactor was disconnected). Therefore I would expect Brown, Black, Grey and Earth. I'd only expect a blue in a TP+N system and would expect a grey core in addition in that system too.
Why is this cable coloured like this? Apologies if this is obvious to most, I am only learning at the moment but fascinated. If it helps, the saw isn't new but uses lots of Chinese components internally so I guess isn't that old.
Just a question from a slightly confused trainee about core colours on a three phase appliance.
I was diagnosing a fault on a three-phase saw today (found it - dead isolating transformer) and found that the incoming cable (4 cores) were coloured and connected as such:
L1 Brown
L2 Black
L3 Blue
E Green/Yellow
I didn't look at the saw motor itself but made the assumption that it did not need a neutral (N terminal at the contactor was disconnected). Therefore I would expect Brown, Black, Grey and Earth. I'd only expect a blue in a TP+N system and would expect a grey core in addition in that system too.
Why is this cable coloured like this? Apologies if this is obvious to most, I am only learning at the moment but fascinated. If it helps, the saw isn't new but uses lots of Chinese components internally so I guess isn't that old.