That said, I would think that very few properties have just a 32A breaker at
the in-coming supply entry point (in fact I don't think that the normal 32A
breaker has the "prospective current" breaking capacity to be permitted for it
to be the main entry protective device). In most there will be a "consumer
unit"/panel with a larger 60A or 100A main breaker, which feeds a bank of
smaller breakers: 32A for each ring main, 20A or 40A for large spurs for fixed
heating equipment, and (mostly) 6A for each lighting circuit (which is not are
ring main circuits).
Then (back to the original question!) each of the pluggable appliances will
have fused plug, and any spurs and fixed small appliances, connected to a ring
must have a fused-spur unit (using the same fuses as in the plugs, so 13A max).
Also, in modern installations, there is required to be a Residual Current
Device ("RCD") breaker (or GFCI in N.American parlance) for covering all the
ringmain circuits and another one for the lighting circuits (for very good
reasons as I know from "experience"). However, older installations may only
have one RCD on the power circuits and very old installations (even many early
ringmain installations) won't have them at all unless they have been
substantially updated over the years.
Note: the above comment about RCDs is the case in urban areas, but in remote
areas of the country, with very long supply cables to properties, you may find
Voltage-Operated breakers instead of RCDs to ensure that the internal "house
metalwork" doesn't rise above acceptable limits (due to leakage currents etc.)
w.r.t. the surrounding earth/ground conditions. Don't know much about those or
how they are installed and so I can't give any details.
John E Allen
W.London, UK
-----Original Message-----
From: John Woodgate [mailto:[email protected]]
Sent: 17 December 2016 08:37
To: [email protected]
Subject: Re: [PSES] British question, about a BS1363 plug-in power supply
Before breakers were mandatory, a 30 A fuse could be used instead.
With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M
Woodgate and Associates Rayleigh England
Sylvae in aeternum manent.
-----Original Message-----
From: Scott Xe [mailto:[email protected]]
Sent: Saturday, December 17, 2016 5:39 AM
To: John Woodgate <[email protected]>; [email protected]
Subject: Re: [PSES] British question, about a BS1363 plug-in power supply
John,
Is the 32A breaker an IRE requirement and every household must comply
regardless how old the house is? On one occasion, some UK engineers told me
that a small group of house in UK and EU still do not have such 32A breaker
installed. Thus the equipment complying with LVD Directive may not be safe in
abnormal operation.
Scott
-----Original Message-----
From: John Woodgate [mailto:[email protected]]
Sent: Monday, December 12, 2016 1:50 PM
To: Ralph McDiarmid <[email protected]>;
[email protected]
Subject: RE: [PSES] British question, about a BS1363 plug-in power supply
A 32 A breaker connects to a loop of 2.5 mm^2 3-core cable (line, neutral
and protective). A large number (there is a limit but it's complicated) of
13 A wall outlets can be connected to this ring, relying on diversity to
keep the total current below 32 A.
With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk
J M Woodgate and Associates Rayleigh England
Sylvae in aeternum manent.
-----Original Message-----
From: Ralph McDiarmid [mailto:[email protected]]
Sent: Monday, December 12, 2016 7:34 PM
To: [email protected]
Subject: Re: [PSES] British question, about a BS1363 plug-in power supply
What's a "ring circuit" ?
Ralph McDiarmid
Product Compliance
Engineering
Solar Business
Schneider Electric
From: Richard Nute [mailto:[email protected]]
Sent: Saturday, December 03, 2016 12:01 PM
To: [email protected]
Subject: Re: [PSES] British question, about a BS1363 plug-in power supply
I understood the fuse in the U.K. plug was to protect the power cordage. In
the U.K., outlets are supplied by a ring circuit rather than a branch
circuit, therefore the power cord could exceed its ampacity (a U.S.A. term).
So, if no power cord, no need for a fuse in the plug.
I wonder if the power supply has a fuse to protect the power supply. If so,
would this count as the plug fuse?
Rich
From: John Woodgate [mailto:[email protected]]
Sent: Saturday, December 03, 2016 5:01 AM
To: mailto:[email protected]
Subject: [PSES] British question, about a BS1363 plug-in power supply
I received a 5 W SMPS plug-in power supply as part of a multi-unit product.
It has interchangeable pins for EU, US, Australian and UK sockets, but it
has no fuse. I think this is illegal and intend to notify Trading Standards,
as the overall product is marketed by a prominent European company and is
widely offered on the Internet.
Is there any exemption at all for the requirement that a BS 1363 plug in any
form must have a fuse?
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