Question? Just ask us!
Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair
InspectAPedia ® Home
ELECTRICAL INSPECTION, DIAGNOSIS, REPAIR
ACCURACY vs PRECISION of MEASUREMENTS
AFCIs ARC FAULT CIRCUIT INTERRUPTERS
ALUMINUM SECs & WIRING
ALUMINUM WIRING HAZARDS & REPAIRS
AMPS & VOLTS DETERMINATION
AMPACITY - the LIMITING FACTOR
APPLIANCE EFFICIENCY RATINGS
BACKUP ELECTRICAL GENERATORS
BACK-WIRED ELECTRICAL DEVICES
BOOKSTORE - ELECTRICAL
BUILDING SAFETY HAZARDS GUIDE
Cadet & Encore Heater Recall
CIRCUIT BREAKER FAILURE
CIRCUIT BREAKER SIZE for A/C or HEAT PUMP
Classified CIRCUIT BREAKER WARNING
CORROSION in ELECTRICAL PANELS
CORROSION & MOISTURE SOURCES in PANELS
CUTLER HAMMER PANEL FIRE
DEFINITIONS of ELECTRICAL TERMS
DIRECTORY OF ELECTRICIANS
DMM Digital Multimeter HOW TO USE
ELECTRIC METERS & METER BASES
ELECTRIC MOTOR DIAGNOSTIC GUIDE
ELECTRIC MOTOR OVERLOAD RESET SWITCH
ELECTRIC PANEL AMPACITY
ELECTRIC PANEL INSPECTION
ELECTRIC PANEL MOISTURE
Electric Power Frequency Table
ELECTRICAL DISTRIBUTION PANELS
ELECTRICAL GROUND SYSTEM INSPECTION
ELECTRICAL SERVICE DROP
ELECTRICAL SERVICE ENTRY WIRING
EMF RF FIELD & FREQUENCY DEFINITIONS
FEDERAL PACIFIC FPE HAZARDS
FIRE SAFETY Checklist, CPSC
GFCI PROTECTION,Testing GFCIs AFCIs
HEATING COST FUEL & BTU Cost Table
HEAT TAPE USAGE GUIDE
Hertz - Definitions of KHz MHz GHz THz
KNOB & TUBE WIRING
LIGHTING, EXTERIOR GUIDE
LIGHTING, INTERIOR GUIDE
LIGHTNING PROTECTION SYSTEMS
LOW VOLTAGE BUILDING WIRING
LOW VOLTAGE TRANSFORMER TEST
MAIN ELECTRICAL DISCONNECT
MAIN DISCONNECT AMPACITY
MOISTURE SOURCES in PANELS
MURRAY SIEMENS Recall
PHOTOVOLTAIC POWER SYSTEMS
PUSHMATIC - BULLDOG PANELS
REMOTE ELECTRIC POWER, PHOTOVOLTAIC
RUST in ELECTRICAL PANELS
SAFETY for ELECTRICAL INSPECTORS
SE CABLE SIZES vs AMPS
SIEMENS MURRAY Recall
UNDERGROUND SERVICE LATERALS
VOLTS / AMPS MEASUREMENT EQUIP
VOLTAGE MEASUREMENT METHODS
WIND ENERGY SYSTEMS
WIND TURBINES & LIGHTNING
ZINSCO SYLVANIA ELECTRICAL PANELS
Square D warning on Classified Circuit Breakers: This article reports on safety concerns with use of non OEM circuit breakers in various electrical panels, specifically the use of Classified circuit breakers or other interchangeable circuit breakers in Square D electrical panels. The concerns raised by Square-D in this notice may pertain to use of interchangeable circuit breakers in other electrical panel brands as well. Readers of this article should also see SAFETY for ELECTRICAL INSPECTORS. This website provides information about a variety of electrical hazards in buildings, with articles focused on the inspection, detection, and reporting of electrical hazards and on proper electrical repair methods for unsafe electrical conditions.
Green links show where you are. © Copyright 2014 InspectApedia.com, All Rights Reserved.
Square D Company (Groupe Schneider)
August 30, 1995
SUBJECT: Classified Circuit Breakers
Square D Company recognizes the important electrical safety role played by electrical inspectors. because of this role, we want you to be aware of the possible reduction in the level of public safety from the use of Classified circuit breakers and other types of interchangeable circuit breakers.
Square D opposes the use of Classified circuit breakers and other forms of interchangeable circuit breakers in panels not listed or labeled to accept them. Our position is based on the National Electrical Code (NEC) Section 110-3(b) that requires equipment to be "used or installed in accordance with any instructions included in the listing or labeling," and our concern with public safety.
Enclosed is literature on the topic and photos of actual field failures involving Classified circuit breakers that were installed in Square D panels. As you can see, use of these circuit breakers may result in reduced electrical protection, loss of warranty, and a reduced level of safety. Many of your fellow electrical inspectors regard use of these circuit breakers as a Code violation.
Square D's reputation was built on quality, unsurpassed electrical protection, and a concern for public safety. That reputation, and the safety of our customers, may be threatened by the use of Classified and interchangeable circuit breakers.
That's why we have taken a leadership role in the education of the public regarding the possible risks associated with the use of Classified and interchangeable circuit breakers.
We encourage you to use the information enclosed to maintain the excellent record of safety we enjoy in U.S. electrical Installations.
[Enclosed photographs and data are reproduced below.]
Here is an example of what could happen when a Classified circuit breaker is used with a Square D load center. Square D load centers are designed as a system with mechanical, electrical and heat dissipation standards which exceed minimum standards. Square D's warranty is void when a Classified breaker is installed.
A consumer information flyer from Square D includes text citing that Genuine QO circuit breakers are available only from Square D. Though circuit breakers that fit Square D QO load centers are available, Square D's flyer informs consumers that imitations ar rarely as good as the real thing. Square D's flyer continues that QO circuit breaker 15A and 20A QWIK-OPEN® breakers can trip "faster than the blink of an eye on overcurrents as low as 200 amps."
["Load Centers" are listed and marked as panelboards but commonly called "load centers".]
The flyer points out that QO circuit breakers have been tested and are UL Listed as a system for use in all QO load centers and panelboards. UL Classified imitation QO circuit breakers have not undergone the same testing as genuine QO circuit breakers, and have not been tested in all equipment marked to accept QO circuit breakers.
While the standard QO load center has a 22,000/10,000 amperes short circuit current rating, UL Classified imitation QO breakers are prohibited from use in series rated applications, or applications where there is greater than 10,000 amperes available fault current. The only way to be certain of a UL Listed combination and proper application is to use only genuine QO circuit breakers in Q) equipment.
Green link shows where you are in this article series.
Frequently Asked Questions (FAQs)
No FAQs have been posted for this page. Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia.
Questions & answers or comments about the hazards of using non OEM or "replacement" circuit breakers - Classified circuit breakers - warning by Square-D corporation.
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
Search the InspectApedia website
HTML Comment Box is loading comments...
Technical Reviewers & References
Related Topics, found near the top of this page suggest articles closely related to this one.