Use of Imitation Square D Circuit Breakers   Imitation Square D Circuit Breakers are being manufactured by several leading electrical manufacturers for use in Square D load centers. These circuit breakers are UL classified but are not UL listed. Square D in a May 1995 bulletin states that the Square D warranty on the panel and all circuit breakers (including any Square D circuit breakers) is void if used with imitation Square D circuit breakers. Additionally, the National Electrical Code Section 110-3(b) states that, Listed or labeled equipment shall be used or installed in accordance with any instructions included in the listing or labeling. Square D maintains that to use imitation square D circuit breakers in Square D listed panels is not part of the instructions and is a violation of NEC 110-3(b). © 1996 Gerald Newton. All rights reserved.