Compressor motor marked spl

[josoglory]

compressor

compressor

Ok Guys, I appreciate all the help, but let me ask you this....

I was also told that I could size the ocp and conductors based on the flc that should be listed on the nameplate. Is this true? Do I Still Have to X 125%....? I'm Just hoping the customer produces the paperwork for this compressor i will then reverse engineer it for you all here when I am finished.:roll:

 

[tryinghard]

In my grasping I see 430-31 would because it uses the thermal protector (430-32(A)(3)) as the "overload device intended to protect the motor branch-circuit conductors", the breaker is only for short circuit and ground fault protection - just like in a real motor application . So 210-21(B)(1) is met because the receptacle is not below the ampere rating of the branch-circuit (the TP).

I agree with you and your thought with the marketing junk. Maybe it's worth it to contact the manufacture to ask for their method of compliance with NEC.

Either way I don't see how this compressor complies with Article 430, 430-6(A)(1) ex 1 may be it but it would need to be "marked with both motor horsepower and full-load current". I see now I'm really just arguing for a breaker but nuisance tripping in this case would be an under-supplied circuit and I see that as a code violation, I don't think breakers jump in price until 60A though.

 

[tryinghard]

...I was also told that I could size the ocp and conductors based on the flc that should be listed on the nameplate. Is this true?...

No normally the only item sized from the nameplate is the overloads 430-6(A)(2) & 430-31. All the other components for the circuit are supposed to be sized from the appropriate table in 430-247 through 250 as per 430-6(A)(1) which is slightly higher then the nameplate. The only way that I know of around this is with 430-6(A)(1) exception No. 3 and with this you would still multiply 250% for the OCP in keeping with 430-52

You really can circuit this compressor as per Post #15. You may call the manufacture to qualify the breaker size but NEC sizes it up to 40A, if you provide a 20A or 15A it may not hold. Heck install it and clamp on, note your start up and peak ampere when the tank fills and cycles off.