Advice on a BS 7671 exam question please

[Richard Burns]

Section 443 although mentioning switching of equipment within the installation actually only covers atmospheric overvoltage in the description.
Depending on the meaning "operation" could mean automatic or manual operation; in the case of automatic operation the overcurrent not the overvoltage is the protection this device is providing.
Motors running and voltage recovery could also lead consequentially to overvoltage against which protection presumably should be provided but again not covered by 443.
Therefore c is the most appropriate response even though the others could be considered relevant C is the most relvant.

 

[John Lundrigan]

Well said, for the examiner it is a matter of choosing distracting options that are not outrageously wrong and this question does it quite well; although recovery voltage would never exceed the normal supply.

 

[Adj]

In answer to another Peterborough colleague.

Because we are all experienced practitioners, there is always a tendency to over think these multi choice questions. This question’s purpose will be to prove that the candidate can correctly identify a defining statement, in this case 131.6.2. The correct answer will be the choice of the word(s) that appear in or are closest to that statement.

The term “atmospheric events” appears in the answer and is included in the statement of fundamental principle, whereas the other answers, although having some validity, do not.

Blimey, this is a bit pedantic for a Wednesday – think I’ll finish lunch and smack a back box into some blockwork.