A few 2381 questions i cannot find answers for in regs

[cavester]

i am doing the 2381 simulator, passed every one with 84 % so far but here is a couple of questions, which i cannot find answers for.


1. industrial installation has measured short circuit current at intake of 26KA, the type of protective device suitable to be installed at this point without backup would be
a. BS 3036 semi enclosed fuse
b. BS EN 60898 circuit breaker
c. BS 1361 type 1 fuse
d. BS 88 -2.1 or 6 fuse

2. 16 mm multicore cable incorporating a CPC is insulated with 90oC thermosetting insulation, given fault current of 500A and a disconnection time of 0.4s the minimum acceptable size of CPC would be
a. 1.5mm
b. 2.5mm
c. 4 mm
d. 6 mm

3. a single phase load of 13A is supplied via a 15A BS 1361 fuse using single core 70oC PVC copper cables installed to Method 3, correction factors are, Cg is 0.7, Ct 0.87 and overload protection is to be provided, the minimum acceptable size cable would be?
a. 1mm
b. 1.5mm
c. 2.5mm
d. 4mm

i have looked everywhere in section 5 for this one and i cannot find it

thanks for help if you can

daz

[cavester]

Thank you very much, you have been a great help.
Been a while since i have looked at the Regs and you forget where to look and certainly forge the formulas.

cheers again

daz