incoming voltage is 288-291v

[Monkeh]

The reference for this was BS 7697 which is now superseded by BS EN 60038:2011.
I did once find an explanation sheet for them but cannot see it now, and of course the good old UK wants to charge to download it!!

BS EN 60038:2011 legally downloaded for free... Will have a read later.

 

[westie101]

BS EN 60038:2011 legally downloaded for free.

If I'm wrong, let me know so I can give out Policy & Standards Folk the heads up!

 

[Monkeh]

BS EN 60038:2011 legally downloaded for free.

If I'm wrong, let me know so I can give out Policy & Standards Folk the heads up!

It is not a definitive standard, however there is no 5% mentioned, and the voltage is 230V ±10%.

It mentions other documents which I'll check later.

 

[JohnW2]

The 5% thing came as a total surprise to me when i was told of it a few months ago! Up till then I, as you, thought the 253V was the limit. ... You ask what actually is the upper limit, a question I've not yet got answered myself. But as various parts of the industry seemed to have agreed to set the "tripping level" for UPS' and solar inverters at 266V I would work to that figure!

Fair enough. Any idea what would happen (in law or in practice) if it could be demonstrated that a supply voltage excursion to between 253V and 266V had damaged consumer's equipment?

Kind Regards, John

 

[Monkeh]

ESQCR defines this:

(3) For the purposes of this regulation, unless otherwise agreed in writing by those persons specified in paragraph (2), the permitted variations are—
(a)a variation not exceeding 1 per cent above or below the declared frequency;
(b)in the case of a low voltage supply, a variation not exceeding 10 per cent above or 6 per cent below the declared voltage at the declared frequency;

The law is pretty clear: Not exceeding 10% above.

 

[dormermike]

Steady at 250/251 at moment