On Sunday, 24 March 2019 10:39:12 UTC, Tim Lamb wrote:
In message ,
tabbypurr writes
On Sunday, 24 March 2019 09:52:09 UTC, ARW wrote:
On 24/03/2019 00:17, John Rumm wrote:
On 23/03/2019 09:23, ARW wrote:
On 22/03/2019 20:18, wrote:
On Thursday, March 21, 2019 at 11:29:13 PM UTC, ARW wrote:

If you go ahead with it I'll post a few more tips than the wiki article
about real life CU swaps.

I'd be interested in that anyway if you have the time? Would it be
worth adding to the article?


John or NT usually add anything worthwhile I post to the wiki.

So here are a couple of tips that would apply if I had more than 2
hours to swap a CU!

OK I have woven some extra stuff into the existing article based on
these comments.



Anyone one else (including yourself) got any other tips?

I generally get a couple of hours to swap a CU (plus time to test). It
usually takes me 90 minutes to prep it up and mount the board with the
cables where I want them. The last 30 minutes is fitting the live,
neutrals and MCBs or RCBOs.

Wylex RCBOs don't like to grip 2x 2.5mm cables unless they're twisted
together. That can catch people out.

Hmmm.. recent fiddling with ceiling roses (electrician fitted during the
last 12 months) indicates that twisted earth wires may loosen over time.
This version has a large brass post with ample space for three twisted
earth wires. Of the 5 sets 3 were very slack. I suppose the driver
needed for tightening the other shrouded terminals would be inadequate
for the bigger earth screw. Or possibly that twisted solid cores can
migrate?

I don't think twisted cores are any more vulnerable to loosening, if anything they're less so, as you're less likely to end up with one weakly gripped. Screw connectors are known for coming loose, especially if not done up well to begin with.


NT