RigusTheo
Electrical
- Mar 21, 2024
- 1
thread237-194364
Good afternoon,
I come across this situation all the time and I wanted to see if anyone here had a response to how they handle it. Very often I come across HVAC equipment that lists FLA/RLA, MCA and MOCP, where the MOCP listed is actually <125% FLA.
Now I know MOCP is often referred to as being calculated as (225% largest load + 100% remaining loads) and then round DOWN to the next standard size. What I don't understand is how this is really a "complete framework" of thinking, so to speak. One consideration for example is that most overcurrent protection is 80% rated such that if this HVAC package is a continuous load, I can't select overcurrent protection where the FLA > 80% OCPD. Yet often this will end up in conflict with the vendor's listed MOCP which is often smaller than 125% FLA.
Any thoughts from anyone? Have a great day.
Good afternoon,
I come across this situation all the time and I wanted to see if anyone here had a response to how they handle it. Very often I come across HVAC equipment that lists FLA/RLA, MCA and MOCP, where the MOCP listed is actually <125% FLA.
Now I know MOCP is often referred to as being calculated as (225% largest load + 100% remaining loads) and then round DOWN to the next standard size. What I don't understand is how this is really a "complete framework" of thinking, so to speak. One consideration for example is that most overcurrent protection is 80% rated such that if this HVAC package is a continuous load, I can't select overcurrent protection where the FLA > 80% OCPD. Yet often this will end up in conflict with the vendor's listed MOCP which is often smaller than 125% FLA.
Any thoughts from anyone? Have a great day.