Electrical Enclosure Nameplates

[badenight]

I would like to know if someone can point me in the right direction or tell me what is needed for the following. I have several motors of various Horsepower all connected into one panel. What is the Horsepower rating that goes on the nameplate

 

[fros]

IN MY OPNION THE POWER IN THE NAME PLATE IS THE MECHNICAL POWER AND YOU SHOUL MULTIPALE IT BY THE (P2/P1) WHICH INDICATE AT THE NAME PLATE

 

[peebee]

Which nameplate? On the panel? Is this a field installation in the US? If so, well, horsepower ratings don't usually go on the panel; they're just on the motors. Or maybe you'd list the quantity and hp ratings of the connected motors. Maybe I'm missing the point of your question, if so please clarify.

Even if you are an original equipment manufacturer (OEM), usually you'd just put a full-load-amps (FLA) rating on the panel, possibly supplemented with maximum overcurrent protection (MOP) and minimum circuit ampacity (MCA) ratings. If you are an OEM, though, I'm surprised you'd be asking this question.

 

[jbartos]

Suggestion: Typically, if you have an enclosure that is housing the protection and possibly controls for many loads, the enclosure should have ampere rating, voltage rating, ?-phases, Short Circuit kVA or MVA rating, and Environmental Classification, e.g. NEMA 1 if low voltage up to 1000VAC. Medium voltage may have indoor or outdoor enclosure classification beside possibly hazardous classifications, e.g. NEMA 9.

 

[busbar]

Consult Underwriter's Lab Standard 508 for Industrial Control Equipment.

 

[badenight]

Thanks for everyone's input. I am a Controls Designer in Canada for an Automation Company that builds Automated Control Systems for the Auto industry. Our company puts on the Hp rating of any panel that has control of a motor. We have been told by an inspector which has influence a licenced electrician that you need to add up all the Hp ratings of all the motors and put the total on the Nameplate. My understand is you put the largest one only. I can not find anything in any electrical code which state what an inspector has said.

 

[peebee]

There's no US code that would require that. Some facilties engineers like to include load information, and that's a great idea, but it's not required by US codes. I have no experience in Canada.

Adding up the horspowers and stating that total makes little sense to me, as that number is at best vague and at worst misleading. There's very little information to be gained from such a number outside of assistance in generating a crude estimate of full load amps. Such a number could NOT be used to size feeders, protection, etc., and therefore is almost useless.

Listing the individual motor sizes would make more sense to me. If you're inspector's cool with that, I'd provide that instead. But generally, I'd say put whatever nameplate he wants on there just to shut him up and keep him happy. Nameplates are cheap, and no-one should really trust such a nameplate anyway, but rather look at the motors or drawings to see what's really connected.