2018年7月12日 · AF/AT are the same concept for Circuit Breakers, except Amp Frame / Amp Trip. Frame sizes vary a lot more from mfrs to mfr, so some have 100AF, some are 125AF, some only start at 150AF, etc. then in larger frames, some mfrs have dropped some old traditional frame sizes such as 600AF because their newer 800AF is the same physical size anyway.

2015年12月4日 · circuit. Exception No. 1: A receptacle installed in accordance with 430.81(B). Exception No. 2: A receptacle installed exclusively for the use of a cord-and-plug-connected arc welder shall be permitted to have an ampere rating not less than the minimum branch-circuit conductor ampacity determined by 630.11(A) for arc welders.

2021年12月21日 · The only breakers you can legally use in a panel are those the panel maker lists on the cover, or what are called “classified” breakers which will be listed in SPECIFIC competitive panels documented by the BREAKER mfr. Siemens only sells classified breakers for Sq.D QO panels.

2017年9月23日 · Is that third breaker upside down? If so, it cannot be installed like that. 240.81 Indicating. Circuit breakers shall clearly indicate whether they are in the open “off” or closed “on” position. Where circuit breaker handles are operated vertically rather than rotationally or horizontally, the “up” position of

2022年11月11日 · Keep in mind that every circuit breaker has a longtime, short time and instantaneous trip characteristic, but adding LSI to the breaker symbol on your oneline implies that you have defined that it means you want adjustable characteristics (ass opposed to fixed values) and that you will provide those settings (or specify for a coordination study to be done by a 3rd …

2004年11月16日 · Re: AF and AT breaker notation Frame rating and trip rating are often different, although often the same. Adjustable breakers certainly are an example. The frame rating is a maximum rating of the based on the design of the particular type of breaker, and the trip rating is some multipler, 1 or less, that the breaker is set to trip at.

2010年10月21日 · of the operating handle of the switch or circuit breaker,when in its highest position, is not more than 2.0 m (6 ft 7 in.) above the floor or working platform, unless one of the following applies: (1) For busways, as provided in 368.17(C). (2) For supplementary overcurrent protection, as described in 240.10.

2018年1月29日 · it depends also on the "circuit breaker" that is being used. For example of the design is using what are now called "Motor Protection Circuit Breakers (MPCB), those are different from the older "Motor Circuit Protector" (MPC) breakers, as well as different from traditional "Circuit Breakers" typically referencing Thermal-Magnetic" or "I 2 t" circuit breakers.

2011年2月24日 · The breaker contacts must be able to open the circuit while subject to the voltage and current without self-destructing, and thus must be rated to withstand the voltage across it at the time. That said, most 2-pole and all 3-pole breakers I remember checking were not 120/240v slash-rated, but were straight-rated for 240v, the higher voltage.

2004年12月20日 · Re: temperature rating on breaker Bob, You're right, if the rules are followed. My example was only to point out how the cable affects the breaker. Yes,I agree that a breaker with 60deg terminals when applied with 75degC rated wire the wire must be applied at 60degC.