Handy notes to keep in phone

[Calebp43]

I have all the new brown books and other electrical books but I was thinking it might be a good idea to keep a note in my phone of things I'm probably gonna want to know/check frequently. I'm still an apprentice. Should be qualified this year... And I think this might be a good way to hammer down some important things. I also only really do domestic stuff so far.
I have so far written down the ccc of cables that we use a lot (with relevant methods) and the voltage drop equation with the pages. Also zones for drilling joists. Max ze types. Any recommendations for something handy I should note? Thanks in advance.

 

[pc1966]

No requirement for the x5 test now. What was the theory behind the x5 test anyway?

I am not sure, but possibly the old electro-mechanical sorts would take longer at low currents (the 300ms limit) but ought to be down to a short time at higher currents (where you are more likely to die), at least if not a "delay" type where 300ms is also a pass even then. So a test a 5*In would prove it worked fast / non-delay.

These days I think RCD will still trip without neutral (i.e. unpowered internal electronics) but don't know if that really would make it longer than the 10-40ms normally seen even at In testing.

If I have spare time and MTF kicking around I might try test that out,