Cable Tray

[Elekk]

Can I bunch together several cables in the same tray instead of spacing them apart one cable diameter?

Can cables be layered one on top of the other? If yes, how many vertical layers can be placed in the same tray?

 

[danny7299]

Ate the cables the same voltage , I.e 230/400v or 12/24v ?

 

[Elekk]

The supply voltage for all cables will be 400V three phase and the rating of all cables will be 600/1000V.

 

[Sidewinder]

Yes you can but you need to re-calculate the "loading factors etc." for the modification really to be 100% compliant.

 

[spinlondon]

Yes you can, but you will have to de-rate the cables appropriately.

The highest I've ever stacked cables is 3 high.

 

[Elekk]

what regulation of BS7671 gives the derating factor for bunched cables (2 high, 3 high, etc)?

 

[Sidewinder]

Spin seems to have his book to hand.

I'm sure he will come up with this soon.

You will have to calculate for the existing and the new cables.

However, are the motors on inverters?

Thinking about your other thread.

 

[spinlondon]

It's not so mch a Regulation as an Appendix.

Appendix 4.

 

[Elekk]

Sidewinder, yes the motors are on inverters...