"John Rumm" wrote in message
...
"Changing a consumer unit" this time:

http://wiki.diyfaq.org.uk/index.php?..._consumer_unit

Feel free to post corrections here or on the articles discussion page, or
make them yourself.

Any obvious bits missing, unclear or misleading?

Should more or less detail be included in the live working section?

I feel there ought to be more words on dealing with a substandard TN-S
earth provision (i.e. skinny bit of uninsulated rusty wire connection
incoming cable sheath to old fusebox etc). Thoughts?

Any pictures needed?


Hi John,

I would propose another reason to change:
- To rationalize or simplify an existing existing which is complex (either
just to reclaim space, or to make use of the system less prone to errors).

Under Planning-Split Load Vs Multiple, it wasn't clear to me from the text
why you can get away without a time delayed RCD in a TT system if you have
multiple CUs. I think you mean this is because both CUs are to be wired in
parallel with each other, so one can have the 100mA RCD and the other a
30mA, and because they're in parallel the 100mA isn't behind (or in front of
depending on your view!) the 30mA. I think this could use clarification.

Under Starting Work-?Disconnecting the power, I thought there were cases
where is was legal to pull the main supply fuse - for example to avoid (or
put out) an electrical fire. In any case I think this could use a statement
that you can ask the supplier for permission which they should grant
(although perhaps for a fee), and may even come out and reinstall the seal.
Perhaps also a suggestion that now might be a good time to try and persuade
the supplier to come out and install a breaker for you (using mutterings
about safety to try and get a freebie).

Your link to VIR rubber cable link in Removing the Old CU is broken.

In Installing new CU-Prepare the new CU, your cable_crimping link is broken
(an extraneous _crimped I think).

Finally, I wonder if the various sections that refer (sometimes implicitly)
to extending circuit lengths shouild note that voltage drop may need to be
consider.

Cheers,
Piers