I may be wrong, but I believe that if you cannot locate supplementary bonding but a test shows below 0.05 between all partd it can be presumed that it is bonded?
Basically to achieve what dave is saying you need to make sure that the resistance between all simultaneously accessible exposed conductive parts, extraneous conductive parts and exposed and extraneous conductive parts is less then or equal to 0.05 ohms.
Fair point, I see no need in a domestic installation situation to ever use 433-3-1. The standard circuits defined in the onsite guide are all that should be used in a new build/re-wire, However for an EICR its a different matter.
In honesty depends on the lad in question and what you think of him, however from personal experience as a school leaver apprentice, I can say that at 16 I didn't take work that seriously and wanted just to get through the day doing as little as possible (a continuation of school essentially)...
MK and crabtree both do metal faceplates for the modules, I have never seen metal modules though. The modules tend to fall out a lot less then on the toolstation specials though!
Quite common in council properties, Wylex used to a 'superdeal special' with 3x main switches 1 for day rate, 1 for off peak and 1 for superdeal immersion, 3 sets of tails were needed.
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