Which thickness CY cable do I need for 1.5kW spindle?

[Lee Roberts]

Lee that is helpful but the chart does not show if the cables are in free space or bunched together in one sleeve as the cable will have to be derated when bunched because of heat build up.

Edit Lee the Watts to Amps conversion has to state the voltage I know you have it done at 230V

OK, to clarify:

Cg represents the derating factor for grouping cables.

A cable with a current rating of 6 amp installed in trunking alongside other circuits, that's circuits not cables!, would now have a Cg value, the Cg value is 0.57.

This means the cable current rating becomes: 6 x 0.57, that's 3.42 amp.

To add to this, you should note that the grouping factors are based on assumption, the assumption that all of the cables in the group are carrying their rated current.

So, if however a cable is not going to be carrying more than 30% of its grouped current rating, that cable can actually be omitted from the group rating calculation...

...an example, if you've got lets say 6 circuits in a group of cables but 1 of those cables is known to be operating below the said 30% consistently, you can safely calculate the group on the basis that it only consists of 5 circuits.

Here are some correction factors for multicore cable:




OK Clive, how did I do?

.Me

[Clive S]

OK Clive, how did I do?

Fine Lee I was not taking the p#'@s I just thought that the Voltage had to be added etc for the sake of people with no knowledge of sparky stuff.

[Lee Roberts]

Fine Lee I was not taking the p#'@s I just thought that the Voltage had to be added etc for the sake of people with no knowledge of sparky stuff.

I know mate :), I was only having fun, my ask of "how i did" was actually sincere as I only know what I've learnt in an unformal way, im no professional.

At the same time I thought it was a good cue for providing the knowledge, as like you say those conversions need to take the operating voltage into consideration if starting from the beginning and doing your own calculations.

.Me