18th Edition Help BS7671

Question

Good day, 
 
 After years of designing subsea oil and gas equipment, I've decided to return to my original electrician trade (self-employed). I'm carrying out the online training and have found a question with which I need some guidance. I cannot find in the 18th edition Regs causes of severe temporary overvoltages&mdash;any advice gratefully accepted. 
 Thanks 
 Richard

lyledunn · Accepted Answer

The clue in a question like that is "severe temporary overvoltage". Just the examiner looking up a regulation and setting a question to it. Two minutes to find it! Best go straight to the index, look up overvoltage or temporary. The question number should alert you to the Part of the regs that you should be drawn to. So for example, questions 13-27 are on Part 4 so you can ignore any references that dont start with a 4.

AJJewsbury · Answer

I cannot find in the 18th edition Regs causes of severe temporary overvoltages 
 
 Try the section titles in chapter 44 - e.g. 442 - due to earth faults in the HV system and faults in the LV system, 443 - atmospheric origin or switching 
 - Andy.

Alan B · Answer

There's a section the the book on surge protection.

18th Edition Help BS7671

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