On 10/12/2019 12:14, Tim Lamb wrote:
The builders on the neighbouring construction site demanded a single
phase supply to power their portable tools.
I suppose words beginning F and O are in order but, as I had a
beneficial financial involvement in the development, chose to comply.
The only convenient source is the socket outlets in what was our garage
(now sold with incomers Friday). 20 year old install, Wylex 40 amp RCD.

On 3 occasions, something they do before leaving site, trips the
breaker. Not in itself a problem but it also supplies power to the only
entrance doors! I have taken to leaving a door open while the site is
active as the alternative is winding the door up using a very tedious
manual system. Not something I can expect the new owners to take on.

Communicating *get your tools PAT* checked is difficult as I don't speak
any Romanian.

Last job of the day is plug in the chargers and batteries I guess
although I have a 9" angle grinder which will occasionally trip a supply.

Any ideas?

So RCD tripping but no MCB tripping?

But always at the end of the shift?

I wonder if they are switching stuff off and they are switching it off
with a DP switch.

http://www.beama.org.uk/asset/DD77FF...38A083127CA46/

Page 31. Caused by capacitors.

Well that's my best guess fella.

--
Adam