MOCP rating

[anbm]

Can we use 20A breaker instead of 15A breaker (either single phase or 3-phase cases) to protect an equipment with MOCP=15A shown on its data sheet?

 

[iwire]

Can we use 20A breaker instead of 15A breaker (either single phase or 3-phase cases) to protect an equipment with MOCP=15A shown on its data sheet?

No.

 

[augie47]

No.
Among other references NEC 110.3(B)
(You mentioned 'cases' so another reference might be 440.22(C) )

 

[iwire]

You could use a 20 amp breaker if you provided a fused disconnect at the unit with a 15 amp fuse(s)

 

[petersonra]

Can we use 20A breaker instead of 15A breaker (either single phase or 3-phase cases) to protect an equipment with MOCP=15A shown on its data sheet?

it would not be code compliant if it was the only OCPD.

 

[anbm]

it would not be code compliant if it was the only OCPD.

Another scenario...If the data sheet does not have MOCP value, can we use 20A CB if this is a heater and running load is 7.2A?

 

[petersonra]

Another scenario...If the data sheet does not have MOCP value, can we use 20A CB if this is a heater and running load is 7.2A?

what kind of heater is it?

for example, 424.22 has overcurrent protection requirements for electric space heaters.

each of the articles that applies to different types of electric heaters has different requirements for the OCPD.

 

[anbm]

what kind of heater is it?

for example, 424.22 has overcurrent protection requirements for electric space heaters.

each of the articles that applies to different types of electric heaters has different requirements for the OCPD.

wall mounted electric heater.

 

[Smart $]

wall mounted electric heater.

Unless there are other mitigating factors not mentioned, I say yes, it is permitted. Requirements are covered in 210.22 or 210.23(A). You have to remember that OCPD rating is basically to protect the circuit conductors, not the supplied equipment.

 

[iwire]

Unless there are other mitigating factors not mentioned, I say yes, it is permitted. Requirements are covered in 210.22 or 210.23(A). You have to remember that OCPD rating is basically to protect the circuit conductors, not the supplied equipment.

I am sticking with no assuming the 'data sheet' matches the units labeling.

MOCP=15A shown on its data sheet?

110.3(B) requires us to follow the labeling.

 

[Smart $]

I am sticking with no assuming the 'data sheet' matches the units labeling.

I concede to your comment over mine...

...but want to note the label differing from the data sheet would be considered one of the mitigating factors that I mentioned.