siggy
21st December 2007, 11:59 PM
Hello there I build electrical control panels, in Canada, for Magnesium Furnaces. I am trying to help our company designer with a few problems
Firstly, bareing in mind the new hamonisation colours. My designer has a few questions. What colours, if any are used to identify the following voltages
400Vac
240Vac
120Vac
0Vac
24Vdc
0Vdc
If we use the new Harmonisation colours of Brown Black Grey for the 3 phase incoming supply, what colour would be required for the phase to neutral colour Brown and Blue, What of the other phases still brown and blue or do you use black and grey?
In Canada we would use black and DARK blue for 240V and Light blue for 24Vdc both positive and negative legs, Red and white are used for 120Vac so some confusion is arising over what colour we can use and would it be rejected upon testing if we used the wrong (read Canada Colouring code) colours
I believe we can also use three black conductors to bring in the supply to the panels and label them L1,L2,L3 now how we do it is the first Disconnect is called 1Q1 and the three lines out are therefore labelled 1Q1-L1, 1Q1-L2, 1Q1-L3 would this acceptable in the UK? If we used all black wires labelled according would we then have to change colours for phase Identification inside the panels
Also how would we create a neutral for "line to neutral" (power distribution is 3 wire 3 phase IIRC) so no neutral on power lines is it created locally or does the National grid carry a fourth "neutral line" if not I assume the factory/foundry would create the nuetral (by grounding?)
Lots of Questions and Probably lots more comming
Firstly, bareing in mind the new hamonisation colours. My designer has a few questions. What colours, if any are used to identify the following voltages
400Vac
240Vac
120Vac
0Vac
24Vdc
0Vdc
If we use the new Harmonisation colours of Brown Black Grey for the 3 phase incoming supply, what colour would be required for the phase to neutral colour Brown and Blue, What of the other phases still brown and blue or do you use black and grey?
In Canada we would use black and DARK blue for 240V and Light blue for 24Vdc both positive and negative legs, Red and white are used for 120Vac so some confusion is arising over what colour we can use and would it be rejected upon testing if we used the wrong (read Canada Colouring code) colours
I believe we can also use three black conductors to bring in the supply to the panels and label them L1,L2,L3 now how we do it is the first Disconnect is called 1Q1 and the three lines out are therefore labelled 1Q1-L1, 1Q1-L2, 1Q1-L3 would this acceptable in the UK? If we used all black wires labelled according would we then have to change colours for phase Identification inside the panels
Also how would we create a neutral for "line to neutral" (power distribution is 3 wire 3 phase IIRC) so no neutral on power lines is it created locally or does the National grid carry a fourth "neutral line" if not I assume the factory/foundry would create the nuetral (by grounding?)
Lots of Questions and Probably lots more comming