It isn't often that you can carryout the insulation resistance test will all circuit connected because of RCD protection in a consumer unit. In this video Marcus has no RCCB's or RCBO's in the consumer unit (fuse box) so he can test between all line conductor to the neutral bar, all line conductor the the earth bar and between all neutral and earth connections. Marcus shows how using 250 volts DC from his Megger MFT tester can prove all loads have been removed when testing between line and neutral (live conductors). After achieving a low insulation result between the neutral and earth bar Marcus show how to track down the circuit that has the fault.
🕕 Time Stamps - Cut to the action 🕕
00:00 - Low insulation resistance
00:41 - Setting up our Megger MFT tester
01:23 - 2M ohms
02:10 - Pre tests before changing the board
02:47 - Earthing conductor and bonding are connected
03:34 - Testing between the neutral bar and the earth bar
04:06 - Fault finding
04:48 - Removing circuit number one's neutral
05:40 - Old looking outside light
Videos are training aids for City and Guilds (C and G) and EAL courses Level 1, 2, 3 plus AM2, AM2S and AM2E.
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