What is the difference between ampere frame and ampere trip
If you can describe what you want, i. We don't quite speak the same language, but the physics will be the same. Do you have a formal definition of those terms? And what is an SLD? Cheers OMS, with the benefit of wikipedia one line entry , I now recognise the SLD as the same thing as a fluxogram for power flow, but I suspect no one will call it that in the power distribution game, and will look at me oddly if I say it. Now the original question has really become, either how does one work out the factor by which the breakers are to wound down from abs max.
That is partly to do with breakers available, but also circuit loading and selectivity and is very much part of the full design. Or simply what are the common breaker ratings and available factors. For that a representative maker's data is a good starting point. Originally posted by: mapj1 Cheers OMS, with the benefit of wikipedia one line entry , I now recognise the SLD as the same thing as a fluxogram for power flow, but I suspect no one will call it that in the power distribution game, and will look at me oddly if I say it.
Sure, we might also call it a flow diagram in some circles or a distribution schematic in others Now the original question has really become, either how does one work out the factor by which the breakers are to wound down from abs max. Pretty much a function of the switchgear design to be honest - once the designer can state the loads to be served, the selection of the feeder circuit breaker frame size will be a function of both the temperature rise criteria and the diversity applied.
Related Projects. Hello; I am an electrical engineer with an MEP consulting firm. I have done tonnes of single line diagrams however, I am unclear as to what the AF and AT really are. From what I understand, say I have a Amp frame, the size of the circuit breaker that can be used has to be less or equal to Amps. So what I get from that is that the AF is just an enclosure for the actuall circuit breaker. I would appreciate if you guys could shed some more light on this.
Hi toro54 Manufacturers don't make a seperate case or frame for every ampere rating. Frame size gives the physical dimensions of the breaker case. Trips are the actual amps rating of the breaker. Frame is the insulation housing also known as molded case typically made of composite resin fabricated with an injection molding process.
Trip unit could be fix or interchangeable. Molded case circuit breakers MCCB with the same frame size often are available in wide range of trip amp rating. To expand- You can have a amp frame breaker with different amp trip settings up to Often, the result is not a common circuit breaker size.
Standard sizes for fuses and fixed trip circuit breakers, per A A breaker will never trip when loaded to A. Instead, the device simply has to be able to handle the sum of the continuous load and the noncontinuous load. Ok so the print shows a amp frame with a amp trip how do I size the wire if the amp number is meaningless? The print dosent show the trip at all, thats my point. You size the wire to supply the necessary loads and set the trip settings LSIG on the breaker to properly protect the equipment it is there to protect.
Sounds like semantics to me. The OP asked a simple question,. Location Leesburg, VA. Jraef Moderator Staff member. Maybe it is different for MCCB's that dont use CT's or breakers with series trip devices but thats not the kind of systems I am used to dealing with.
I catually lost sleep over this last night thinking about different EE's using different meansing for AT. If I am wrong, then great I learned something today but no one Including myself has referenced any standard at all, we are all just talking about what we do or have seen.
Also, if I am wrong, there are hundreds of wrong one lines out there. If the AT is the trip setting do you go back and change the one line each time a trip setting is changed? There is not a standard that specifically lists AT definition.