Fire pump controller to fire pump wire

[ronball]

Is their any special wire to be used from controller to fire pump. Will only be going about 6 ' from controller to pump.

Can Greenfield conduit be used for this , if only 6' or less? Running 4/0 copper / for 75 hp 3 phase 208 pump.

Thx
Ron

 

[tom baker]

No and no
See section 696 D.

 

[infinity]

Running 4/0 copper / for 75 hp 3 phase 208 pump.

Is that the correct conductor size or is it wye start/delta run?

 

[tom baker]

The correct size wire, with the EGC would be hard to pull thru FMC.

 

[ronball]

Is that the correct conductor size or is it wye start/delta run?

Fire pump motor rated at 211 amps I believe. Controller lugs only good for sizes up to 250kmil.

 

[ronball]

Is that the correct conductor size or is it wye start/delta run?

This is the size on the fire pump controller spec's. lugs good for up to 250 kmil. 211 amps.

 

[texie]

This is the size on the fire pump controller spec's. lugs good for up to 250 kmil. 211 amps.

Something off here. 75 HP @208 across the line starting needs conductor ampacity of 264 amps.

 

[infinity]

Something off here. 75 HP @208 across the line starting needs conductor ampacity of 264 amps.

Yup that's what I was thinking, from T430.250 the FLC is 211*125%=264. If the terminals are only rated for 250 kcmil they're too small because the minimum conductor size is 300 kcmil unless it's a Wye start/Delta run controller then:

FLA*58%*125%=211*.58*1.25=153 amps with (6)-#2/0 conductors to the motor.

 

[texie]

Yup that's what I was thinking, from T430.250 the FLC is 211*125%=264. If the terminals are only rated for 250 kcmil they're too small because the minimum conductor size is 300 kcmil unless it's a Wye start/Delta run controller then:

FLA*58%*125%=211*.58*1.25=153 amps with (6)-#2/0 conductors to the motor.

I agree. And the math works for all 6 to be in one LT flex to the motor.