DISCONNECT OR NOT
DISCONNECT OR NOT
(OP)
We have (1) 10HP, 575 Volts 3p motor and
(2) 70kW, 600 Volts 3p heater
provided to be connected to one circuit from 600V A.C. panel.
Each load ( heater or motor)is delivered with its own fuse protection.
Is it necessary to provide diconnect (or fuse switch)between these fuses and main C.B.
I mean two disconnects - one for heater plus one for motor.
I am in Canada
Thanks.
(2) 70kW, 600 Volts 3p heater
provided to be connected to one circuit from 600V A.C. panel.
Each load ( heater or motor)is delivered with its own fuse protection.
Is it necessary to provide diconnect (or fuse switch)between these fuses and main C.B.
I mean two disconnects - one for heater plus one for motor.
I am in Canada
Thanks.






RE: DISCONNECT OR NOT
Mike
RE: DISCONNECT OR NOT
If you don't have overload relay but you can afford to have the motor burnt-out when it gets overloaded, then it is not a concern.
The question of disconnect switches for motor and heater depends on whether you need to isolate only one of the two. If you always have to shutdown both of them, the main CB (padlockable) should be sufficient.
RE: DISCONNECT OR NOT
RE: DISCONNECT OR NOT
I think that 28-604 (3) applies and you need a disconnect within sight and 3 meters of the equipment.