1) b - 0.5 and 0.65
The value you measure on the cross connect test is one quater of the sum of the end to end resistances of the conductors in question so
(1+1)*0.25 = 0.5, and (1+1.6)*0.25
Reason is, the centre is the worst case, consider just one conductor at a time, if its one ohm from end to end, each end to the center is half an ohm, stick both of them in parallel and the resistance is halfed again, giving the magical R1+R2 = (r1+r2)/4 formula
2) b - local sup bonding
common sense, and if you want a reg number, see that 413-02-27 makes no mention of the MET
3) A - RCD
RCD is not overcurrent device, common sense
4) c - date of last inspection and date of next inspection 514-12-01
5) D - bs88 only one with suffficent breaking capacity, page 50 OSG
6) C- 30ma RCD, look just about anywhere in part 6, occurs time and time again, bathrooms, caravans, etc
7) A person or body responsible for maintaince, etc : 341-01-01
8) A - Haazards from failure, etc : 314-01-02
9) A- borrowed neutrals - common sense - 314-01-04
10- hmm, I'd go with B, load current, it doesn't affect the type of wiring system, only the size of the conductors
11 - A nasty question, the only ones in chapter 411 for both indirect and direct are selv and limitation of discharge of energy (refers to electric cattle fences, etc), I assume it wants C (currents through livestock and people) 411-04-01, though when I first read the Q, I assumed C was a red
herring and outlined the purpose of shock protection, but none of the answers has anything to do with SELV and the wording is similar to 411-04-01 (although prevent instead of limit
), (EEB)ADS, Class II insulation and bonding are all methods against indirect contact
anyone who knows any better, please speak up
