Mca and mop for hvac

[Bbanks]

Ok, can somebody please explain, with exact code reference and steps/reasons why this works.

MCA 37amps. MoP 60 amps.

Why can I land #8 on a 60amp breaker?

I know theres exceptions in Article 440. Is it in 440.4(b)?

I understand why it would make sense. Larger breaker for inrush. The MCA is already accounting for %125 for ampacity of the wire.

I need help explaining why this is ok to do. Thanks

 

[westward10]

MCA and MOP — What are they and How are they Calculated?

On commercial equipment, there is some information on the data plate of the unit that has to do with safely wiring and protecting the equipment. These ratings are the MCA and MOP. To start this d…

yorkcentraltechtalk.wordpress.com

 

[Megawatt]

MCA and MOP — What are they and How are they Calculated?

On commercial equipment, there is some information on the data plate of the unit that has to do with safely wiring and protecting the equipment. These ratings are the MCA and MOP. To start this d…

yorkcentraltechtalk.wordpress.com

Great job @ westward and excellent reply

 

[Bbanks]

MCA and MOP — What are they and How are they Calculated?

On commercial equipment, there is some information on the data plate of the unit that has to do with safely wiring and protecting the equipment. These ratings are the MCA and MOP. To start this d…

yorkcentraltechtalk.wordpress.com

It says in commercial equipment? Am I taking that litteral? Or does this apply to most Hvac systems, residential included?

 

[Megawatt]

It says in commercial equipment? Am I taking that litteral? Or does this apply to most Hvac systems, residential included?

It is really about residential or industrial. The only difference is the size of the unit.