Mca and mop for hvac

View the thread, titled "Mca and mop for hvac" which is posted in UK Electrical Forum on Electricians Forums.

Bbanks

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
 
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