Cable size for motor Starting

[kendor]

one thing, if the motor is 100m from the supply then you must have a local isolation switch by the motor.

 

[brown-nought]

one thing, if the motor is 100m from the supply then you must have a local isolation switch by the motor.

No, the exercise will do him good.

 

[dw3101]

no, Im going to fit a switch fuse at the supply point - or terminate in existing CU if metal clad.

I will then terminate the SWA in a metal clad (most likely a wylex) CU..

And then run 4mm SWA to The device, It is a 2 post ramp and the control gear has an Isolator built into it, so I dont think one is needed but I know where you are coming from.

David

 

[ban-all-sheds]

No, the exercise will do him good.

 

[crystal ball]

most 3ph induction motors will run on 240/415 3 phase
...
No it is not, single phase input thru inverter drive to 240 three phase output to a delta connected induction motor used for speed control by frequency, with digital I/O for external stop start and optional potentiometer for remote speed control, I have fitted and commissioned plenty over the years

As for the 230/240 comment its still 240 in my house 245 actually

I accept that that may be the case for variable speed induction motors, but most 3 ph induction motors are single speed. They are not designed to run on 240V simply because the UK line voltage is 400V.

I said the declaired voltage is 230 V. Your actual voltage may be 245V at a particular time, and this is within the tolerance of the declaired voltage.

I do not think you have grasped the concept of inverter drives they will work on most standard 3 ph induction motors I have retro fitted them to motors 20+ years of age and will vary the speed by changing frequency it is the single most used method of speed control in industry, have a look in the RS catalogue motors and motor controllers, I never stated that 240 was declared voltage I said a motor will run on 240 or 415 which is correct