I do often wonder however, if a load is switched and there is a short length
of reduced conductivity, would the output on anything connected from that
point also be more prone to some kind of interference, Ie a high start load
momentarily putting a notch into the voltage, or is the crud generally on
mains supplies now so bad that nobody should notice. I notice for example
that I can hear the thud when a 3KW fan heater cuts in on the same ring as
my stereo is on. Not loud, but you can hear it.
Brian

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The Sofa of Brian Gaff...

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"Bob Minchin" wrote in message
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On 19/01/2019 15:48, sm_jamieson wrote:
Usually 25mm meter tails go into the CU these days (up to 100A)
The norminal sizes of internal connections for a standard split CU,
neutral and live connections, etc. seems to be 16mm. For a split CU, you
could say only part load is on each neutral connection I suppose.
But then the neutral connections narrow down on a reducing pin crimp to
perhaps 10mm or less.
Then the neutral bars may be connected by a similar small dimension link.
For example look at the U-shaped bare copper neutral link (factory
fitted) in the photo linked to below.

If the meter tails are 25mm surely the neutral connection from the switch
to the neutral bar should be the same, but it is only 16mm. And also the
neutral bar itself does not seem all that chunky.

The exception is perhaps the live bus bar, which is a couple of
millimetres thick, but are quite large surface area.
But the same current is going through the bus bar as the neutral to main
switch link.

Is this simply a case of relatively short connections are OK in a reduced
dimension ?

Here is a picture of part of my CU (in photobucket):

https://i1139.photobucket.com/albums...tral%20bar.jpg

Just wondering,
Simon.


It is the resistance that is important and on the short link that is
minimal.