QUOTE(JasonTheGreat @ Jun 22 2020, 02:27 PM)
Because, humans make mistakes.Just like traffic light, red is stop, green is go, but millions of people still beat red light.
Colour code supposed to be standardise but theres a lot of faux electrician out there simply connect using any colour. And it gets more complicated if its looping (ie not direct DB because if you change it at one end it might still be wrong halfway- need to trace back that circuit whether it is just that one circuit or others also affected.
If you can confirm using test pen that the live is the hot one, turn off whole DB box, check again and confirm with working test pen that all are off already, then swap the bottom pair (clean wires without paint) correctly, then it should be OK.
That's why rule #1 always assume previous faux electrician is an idiota, test to confirm your test pen is working, test test test before touching any wires, NEVER WORK HOT (live). Always assume the wire is hot and make sure to confirm the DB box is all off as well, even after lunch break always assume someone has turned it on, test test test, and colours are installed by colour blind previous faux electrician.
This post has been edited by ceo684: Jun 22 2020, 02:51 PM