Clients requirments

[Graham Coughlan]

The client has specifically requested three phase fan units to be fitted, each appliance draws a current of 8.67A from a 400v, 50hz ac supply.
One appliance is wired using 21m of multi core 90°C themo-setting insulated non shealthed cable.
The circuit is protected by a triple pole bsen 60898 mcb type c. The cable is to be incorporates into pvc rigid conduit fixed surface mounted in an area where ambient temp is 40c.
The conduit will also partlynbe used for 6 x 2.5mm2 standrd single pvc cables...

Ive gotta find...

1 the rating of the protective decive

2 the relevant correction factors

3 min cable size required

4 max size of cable

5 max permmited volt drop

6 actual volt drop

 

[IQ Electrical]

wooah let me catch up... 5% x 230v = 11.5... Right got that...

I dont understand the rest of that

It's using the single phase maximum volt drop figure multiplied by 1.732 (root 3) to get the 3-phase value.

Or to keep it simple, 5% of 400 Volts = 20 Volts