Hi All, can someone here tell me what the abbrev "HACR" stands for on Sq D breakers. (for use w/ heating and refer equip., having motor group combinations, and marked for use with HACR curcuit breakers.)...so far I looked in articles 240, 404, 440, and the index. just want to know what the abbrev spelled out is. thanks.
This trade uses a lot of acronyms. I went for about three years before I finally asked someone what it stood for (I didn't want to look like an idiot). Waiting that long was the stupid part. That is the nice thing about forums like this, you ask a question and get (normally) an answer without anyone laughing at you.
While we're on this topic, perhaps someone can give me an answer to this:
I have been told that any molded case circuit breaker listed under the UL 429 (I think 429???) for overcurrent devices already meets all of the requirements for an HACR device. I beleive there is something in article 430 of the 2005 that addresses this as well.
Ryan, I found this in the UL White Book but didn't find anything in the 2005 NEC.
Circuit breakers investigated for use with heating, air conditioning and refrigeration equipment comprising multi-motor or combination loads are marked ‘‘HACR TYPE,’’ in conjunction with the Listing Mark. Such circuit breakers are suitable for use with heating, air conditioning and refrigerating equipment marked for use with HACR type circuit breakers. Use of these circuit breakers with heating, air conditioning and refrigerating equipment is limited to installations where the equipment is marked as suitable for use with any properly sized circuit breaker, or is marked for use with a HACR type circuit breaker, or is not limited by any marking as to the type of branch circuit, short-circuit and ground-fault protective device.
This was found under CIRCUIT BREAKERS, MOLDED-CASE AND CIRCUIT BREAKER ENCLOSURES (DIVQ).
CharlieE, that's what actually got this thread started for me. the facility I work at now swapped out a bunch of panels in 2 of our buildings a few years ago, and within the last year, about 40 two-pole breakers "froze up" in the off/tripped position. Upon replacement of said breakers, it was discovered that they were of the HACR type. I had a hunch that they wore out due to misapplication. (they were feeding lights and outlets.) either that, or they just got a bad batch off the production line? >Will