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Will do. At least one of us will learn a lesson :)

That is my thought as well however do you have any idea why they would make that statement about the isolation transformer for a 3-wire 3-phase system?

I recently found a breaker on a three-phase system where if one phase trips, the other two phases won't trip. I was told by someone, "There is an isolation transformer connected to the circuit breaker which eliminates the risk of one phase being live if any of the phases trip" Does this make...

Awesome, thank you for that detailed explanation. Much appreciated!

SceneryDriver, I wouldn't mind reading the code that explains the scenario you outlined. Any chance you recall what section it talks about breakers being too big for receptacles? Thank you for your input.

Hmm, alright. I feel like it would be optimal if they protected both but I'll stick to just focusing on protecting cables.

No. I'm referring to the load (equipment at the end of the cable). Source to 1000A cable to 500A rated F/CB to 1000A cable to 10A load.

To exaggerate the scenario I'm thinking about: if we have a 10A load that is connected using a 1000A rated cable and 500A rated fuse/ circuit breaker (F/CB), if the 10A load short circuits and draws 200A: [ol 1] The F/CB will not open The cable will not catch on fire We 'hope' that the load has...