On 28/02/2019 18:57, GB wrote:
On 28/02/2019 18:36, ARW wrote:
On 28/02/2019 18:12, GB wrote:
On 28/02/2019 18:02, ARW wrote:

Of course the 18th edition has altered that for future installs (I
think you are correct about the OPs lights)

Is that on the basis that it's okay to get electrocuted by the
lighting circuit? Perhaps it's a more refined way to die.

Lighting circuits have generally been classed as safe without RCD
protection. For some reason domestic lighting circuits they are now
unsafe without RCD protection.

The RCD, when it first came into general use was for outside sockets
and using the lawnmower etc. Remember the RCD 13A plug in breakers
before RCDs were common place in CUs?



Our CU was replaced in 1998, and no RCDs for us. We have a couple of
those RCD adapters. I have no idea whether they work, though, as they've
never tripped.

The CU looks like one of these:
https://www.screwfix.com/p/crabtree-...mer-unit/5823p


But it must be the 1998 version. There are 11 ways in use. Do you think
I can fit a couple of RCDs in?

If the Starbreaker has the plug in MCBs it may be possible to fit a
couple of RCBOs.

I was fitting RCD CUs well before 1998.

A photo of your actual CU will help me decide if you can fit an RCBO
(height restrictions apply).

As for your plug in RCD breakers. They should have a test button. This
is nothing more than a switch to imbalance the load via a resistor. It
will not tell you if the RCD is tripping within the required times but
it will give you a guide as to it's ability to work.

--
Adam