3 phase cable sizing

[jam2020]

Hi Guys,

Little help please.Ive got to install a 3phase mortar silo. Information i have been given.

Requires a 16a 5 pin socket outlet (neutral and earth)
100m cable run
Max load 5KW
30ma RCD protected
Assuming c or d type

Its beeen a long time since ive dealt with 3 phase. could someone walk me through this?
Dont mean to sound thick but ive got total head block right now!!

Cheers

 

[telectrix]

you need to find out the actual current per phase that the motor draws before you can calculate cable size. work your current out from the 5kW over 3 phases and go from there.

 

[Sintra]

A couple of formulae that might help

Iz ≥ In ≥ Ib

It ≥ I2 / Ca x Ci x Cg x Cc

Iz = It x Ca x Cg x Ci x Cc

VD = (mV/A/m) x L x Ib / 1000

 

[micknew]

10A C rated 3 phase circuit breaker.

 

[kingeri]

10A C rated 3 phase circuit breaker.

He is asking what cable size to use, not what protective device.