18th edition question help

[gazdkw82]

I took the BS7671 18th Ed exam today. There were a few questions that I couldn't find and are bugging me.

Firstly, can anyone help with the following.

Q. What is the minimum Iz CCC of a conductor protected by a 20A BS3036 circuit protector.

I kept looking at the curve table for a BS3036 but still don't really understand the question.

Any got any ideas?

 

[gazdkw82]

Second one was a question regarding grouping factor for eight conductors in conduit suspended from a ceiling.

I found Cg factors but couldn't find one that was specific for this scenario??

 

[telectrix]

Q. What is the minimum Iz CCC of a conductor protected by a 20A BS3036 circuit protector. 20A (Iz greater than or equal to In)

 

[gazdkw82]

There wasn't an option for 20A.

Think it was

17A
27A
30something A
40something A

 

[gazdkw82]

Oh ffs, I've clicked what Iz is. It's the max CCC of the cable with all factors.

So basically Iz must be greater than or equal to In. It had to be 27A.

 

[telectrix]

as it's a 3036, maybe the divide by 0.75 comes into play, giving you 27A.

 

[Deleted member 26818]

Table 4C1.
Treat it as 4 circuits.