HACR CIRCUIT BREAKER
- Thread starter blief
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dana1028
Senior Member
- Location
- San Francisco Bay area
Re: HACR CIRCUIT BREAKER
1. Where are HACR CBs referenced in the NEC?...they are not...this is a UL listing compliance issue.
2. Can fuses be used instead of HACR CBs? ...yes (unless the nameplate specifically disallows it)...fuses perform better than breakers for these applications.
3. Is it required to use HACR rated CBs on AC units...? yes (UL listing requirements).
Per UL (Category DIVQ)
"... Use of these (HACR) circuit breakers with heating AC and refrigeration equipment [thus HACR] is limited to installations where the equipment is marked as suitable for use with any properly sized circuit breaker..." (in other words, if it does NOT state OK to use CBs, then you must use fuses, if it IS OK to use CBs, they must be HACR-type).
There is a lot more detailed information in the UL 'green book' about these breakers, but that is the jist of the listing information.
BTW - turn off your 'cap locks' key; 'conversing' in all caps is considered 'bad form.'
[ July 06, 2004, 10:11 PM: Message edited by: dana1028 ]
1. Where are HACR CBs referenced in the NEC?...they are not...this is a UL listing compliance issue.
2. Can fuses be used instead of HACR CBs? ...yes (unless the nameplate specifically disallows it)...fuses perform better than breakers for these applications.
3. Is it required to use HACR rated CBs on AC units...? yes (UL listing requirements).
Per UL (Category DIVQ)
"... Use of these (HACR) circuit breakers with heating AC and refrigeration equipment [thus HACR] is limited to installations where the equipment is marked as suitable for use with any properly sized circuit breaker..." (in other words, if it does NOT state OK to use CBs, then you must use fuses, if it IS OK to use CBs, they must be HACR-type).
There is a lot more detailed information in the UL 'green book' about these breakers, but that is the jist of the listing information.
BTW - turn off your 'cap locks' key; 'conversing' in all caps is considered 'bad form.'
[ July 06, 2004, 10:11 PM: Message edited by: dana1028 ]
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: HACR CIRCUIT BREAKER
I don't claim to know a whole lot about HACR breakers, but from my understanding, what made these breakers unique is now standard on all circuit breakers. Can any one here confirm or rebut this? Thanks.
I don't claim to know a whole lot about HACR breakers, but from my understanding, what made these breakers unique is now standard on all circuit breakers. Can any one here confirm or rebut this? Thanks.
sandsnow
Senior Member
- Location
- Southern California
Re: HACR CIRCUIT BREAKER
dana1028
I disagree about the HACR c/b's. UL guide for LZLZ.GuideInfo
Heating, Cooling and Ventilating Equipment in my reading states that you can use any type of c/b if the marking does not specify HACR. quoted below:
In units employing two or more motors or a motor and an electric space heater operating from a single supply circuit, the motor overload protective devices (including thermal protection for motors) and other factory-installed motor circuit components and wiring are investigated on the basis of a compliance with the motor branch circuit short circuit and ground-fault protection requirements of Sec. 430-53(c) of the National Electrical Code. Such multimotor and combination load equipment is to be connected only to a circuit protected by fuses or a circuit breaker with a rating which does not exceed the value marked on the data plate. This marked protective device rating is the maximum for which the equipment has been investigated and found acceptable. Where the marking specifies fuses or "HACR Type" Circuit Breakers, the circuit is intended to be protected only by the type of protective device specified.
I have seen units that do not specify HACR c/b's, just a MAX OCPD rating.
btw, I didn't think they still made small c/b's that weren't HACR rated
dana1028
I disagree about the HACR c/b's. UL guide for LZLZ.GuideInfo
Heating, Cooling and Ventilating Equipment in my reading states that you can use any type of c/b if the marking does not specify HACR. quoted below:
In units employing two or more motors or a motor and an electric space heater operating from a single supply circuit, the motor overload protective devices (including thermal protection for motors) and other factory-installed motor circuit components and wiring are investigated on the basis of a compliance with the motor branch circuit short circuit and ground-fault protection requirements of Sec. 430-53(c) of the National Electrical Code. Such multimotor and combination load equipment is to be connected only to a circuit protected by fuses or a circuit breaker with a rating which does not exceed the value marked on the data plate. This marked protective device rating is the maximum for which the equipment has been investigated and found acceptable. Where the marking specifies fuses or "HACR Type" Circuit Breakers, the circuit is intended to be protected only by the type of protective device specified.
I have seen units that do not specify HACR c/b's, just a MAX OCPD rating.
btw, I didn't think they still made small c/b's that weren't HACR rated
charlie
Senior Member
- Location
- Indianapolis
Re: HACR CIRCUIT BREAKER
If the nameplate indicated the maximum fuse size and does not say anything about a circuit breaker, only a fuse is permitted to be used.
If the nameplate indicated the maximum fuse size and does not say anything about a circuit breaker, only a fuse is permitted to be used.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: HACR CIRCUIT BREAKER
What I heard from Square D, is that the specific HACR listing requirements are now part of the standard requirements for all 2 pole breakers.
What I heard from Square D, is that the specific HACR listing requirements are now part of the standard requirements for all 2 pole breakers.
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