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Topic Title: Power Frequency in IET Wiring Regs
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Created On: 15 September 2013 11:19 AM
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 15 September 2013 11:19 AM
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cleggc

Posts: 2
Joined: 25 July 2008

The term 'Power Frequency' is used several times in The Regs (Eg 444.2.1). It is not, however defined - can anyone help with this? I know what power is and I know what frequency means. Regards, Chris
 15 September 2013 11:45 AM
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daveparry1

Posts: 6091
Joined: 04 July 2007

Frequency of AC power! In the UK it's 50Hz. (alternates 50 times per second)
 15 September 2013 05:25 PM
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davezawadi

Posts: 2618
Joined: 26 June 2002

BS7671 would apply in the UK to fixed installations at other frequencies too, perhaps 60Hz or 400Hz used for special purposes like test rigs for specialist equipment.

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David
CEng etc, don't ask, its a result not a question!
 16 September 2013 01:29 PM
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AJJewsbury

Posts: 11259
Joined: 13 August 2003

I think it usually appears in the phrase "power frequency fault (or stress) voltage" - in a section about voltage disturbances - so my guess it's talking about r.m.s. a.c. voltages derived from the normal supply (made unusual by breaks in N or shorts of one line to earth) - as distinct from the short-term pulses of voltage from lightning or such line.
- Andy.
 30 September 2013 01:47 PM
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cleggc

Posts: 2
Joined: 25 July 2008

Thanks for the responses. My guess aligns with that of Andy too - and I believe that other power source frequency options are significant (but it would be nice to be sure). Regards, Chris (with apologies for the delay).
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