Kitchen Equipment Nameplate

[infinity]

Someone asked me about this nameplate which seems rather odd:

Rated Minimum conductor 90?
MCA: 80 amps
MaxOCPD: 80 amps

Overcurrent Protection Device:
Voltage:480
Phase: 3
Hz:60
Amps: 60

So this unit requires an 80 amp conductor protected by a 60 amp OCPD?

 

[GoldDigger]

Someone asked me about this nameplate which seems rather odd:

Rated Minimum conductor 90?
MCA: 80 amps
MaxOCPD: 80 amps

Overcurrent Protection Device:
Voltage:480
Phase: 3
Hz:60
Amps: 60

So this unit requires an 80 amp conductor protected by a 60 amp OCPD?

Read it this way and it makes perfect sense:

Rated Minimum conductor 90?
This is a heat producing appliance, so you need to use 90C conductors but calculate using 60C ampacity per UL. To save you from having to do this, and since the NEC does not mention this, we have upped the required ampacity for you instead.
MCA: 80 amps There is the conductor size needed
MaxOCPD: 80 amps And there is the size of the OCPD
Overcurrent Protection Device: "time delay fuse or inverse time ckt breaker" There is the type of OCPD required

Oh, and by the way, the nominal electrical characteristics are:
Voltage:480
Phase: 3
Hz:60
Amps: 60 These are the real amps you will measure with your meter, but remember, we are going to tell you above to supply higher ampacity wire because of that 90C/60C issue? And then to protect the wire at its full ampacity because, well, because we like you.
Or maybe there is a motor in it?

 

[kwired]

Someone asked me about this nameplate which seems rather odd:

Rated Minimum conductor 90?
MCA: 80 amps
MaxOCPD: 80 amps

Overcurrent Protection Device:
Voltage:480
Phase: 3
Hz:60
Amps: 60

So this unit requires an 80 amp conductor protected by a 60 amp OCPD?

Typo in your last sentence? It says max overcurrent device is 80 not 60.

It seems to mostly make sense to me. If the load is 60 amps, and they want 125% for continuous load or for motors or maybe they just want 125% for some reason, that means you need a conductor with ampacity of at least 75. My only question would be why they selected a minimum ampacity of 80, but otherwise outside of their instructions nothing would be wrong with a 75 amp conductor protected at 80 amps since 75 is not a standard size.

 

[infinity]

Typo in your last sentence? It says max overcurrent device is 80 not 60.

It seems to mostly make sense to me. If the load is 60 amps, and they want 125% for continuous load or for motors or maybe they just want 125% for some reason, that means you need a conductor with ampacity of at least 75. My only question would be why they selected a minimum ampacity of 80, but otherwise outside of their instructions nothing would be wrong with a 75 amp conductor protected at 80 amps since 75 is not a standard size.

It says near the bottom of the nameplate, "overcurrent protection device-time delay fuse or inverse time circuit breaker" 60 amps. If the OCPD is 60 amps why would you need an 80 amp conductor?

Next wrinkle if you do size the conductors for 80 amps and use a 60 amp OCPD can you size the 80 amp conductor using the 90 degree C column?

 

[kwired]

It says near the bottom of the nameplate, "overcurrent protection device-time delay fuse or inverse time circuit breaker" 60 amps. If the OCPD is 60 amps why would you need an 80 amp conductor?

Next wrinkle if you do size the conductors for 80 amps and use a 60 amp OCPD can you size the 80 amp conductor using the 90 degree C column?

It says "Minimum supply conductor ampacity - 80 amps"

The next line says "overcurrent protection device-time delay fuse or inverse time circuit breaker" but gives no values.

The values on the bottom line I am assuming is the actual rated voltage, phase, frequency and current.

I don't know what your appliance is, but this all makes sense if it is a continuous load of 60 amps multiply by 125% and you need a 75 amp conductor and 80 amp overcurrent device. I still don't know why they don't have minimum supply conductor ampacity as 75 instead of 80, otherwise everything else makes sense to me.

Your second question - I think this is somewhat like conductors in a luminaire outlet box - they are sized to 60 or 75 deg C but the luminaire says they need to be rated 90C because of the heat that is present at that location. The other end of the conductor termination temp would need consideration if you did size to 90C ampacity column.

 

[infinity]

It says "Minimum supply conductor ampacity - 80 amps"

The next line says "overcurrent protection device-time delay fuse or inverse time circuit breaker" but gives no values.

The values on the bottom line I am assuming is the actual rated voltage, phase, frequency and current.

I don't know what your appliance is, but this all makes sense if it is a continuous load of 60 amps multiply by 125% and you need a 75 amp conductor and 80 amp overcurrent device. I still don't know why they don't have minimum supply conductor ampacity as 75 instead of 80, otherwise everything else makes sense to me.

Your second question - I think this is somewhat like conductors in a luminaire outlet box - they are sized to 60 or 75 deg C but the luminaire says they need to be rated 90C because of the heat that is present at that location. The other end of the conductor termination temp would need consideration if you did size to 90C ampacity column.

It could be read that way too.