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Hi All, I'm a DIYer after advice please.
All the lights in my house (ground floor and upstairs) are on one circuit - old colours, as you might expect with the age of house (120 years).
There is a cpc (earth) from the (modern) consumer unit to junction boxes on both floors of the house - verified as less than 1 ohm.
However, that's as far as it goes - the actual fittings (switches and luminaires) are not connected to cpc - they are mostly run in single core.
I'm led to believe that this is okay, providing that the fittings are class II / double insulated / plastic which nearly all of them are. The one metal dimmer switch can easily be replaced with a plastic one.
The issue I have is that we'd like to install metal (class I) light fittings in two upstairs bedrooms. It wouldn't be too tricky to connect them to cpc from junction box, which comes from consumer unit.
What I am not clear about is: would it be adequate to just earth the two class I fittings by extending the cpc from junction box and leave the rest of the installation as is, or;
by introducing class I fittings to the lighting circuit, do all the switches and luminaires on that circuit then also need a cpc connection, regardless of which class they are?
Your expert opinions welcome. Would be good to at least consider my options before getting an electrician in to have a look.
Thanks.
All the lights in my house (ground floor and upstairs) are on one circuit - old colours, as you might expect with the age of house (120 years).
There is a cpc (earth) from the (modern) consumer unit to junction boxes on both floors of the house - verified as less than 1 ohm.
However, that's as far as it goes - the actual fittings (switches and luminaires) are not connected to cpc - they are mostly run in single core.
I'm led to believe that this is okay, providing that the fittings are class II / double insulated / plastic which nearly all of them are. The one metal dimmer switch can easily be replaced with a plastic one.
The issue I have is that we'd like to install metal (class I) light fittings in two upstairs bedrooms. It wouldn't be too tricky to connect them to cpc from junction box, which comes from consumer unit.
What I am not clear about is: would it be adequate to just earth the two class I fittings by extending the cpc from junction box and leave the rest of the installation as is, or;
by introducing class I fittings to the lighting circuit, do all the switches and luminaires on that circuit then also need a cpc connection, regardless of which class they are?
- As a DIYer, can I carry out this work or do regulations mean I need to get electrician to do this?
- Would it be wise to consider updating the system anyway e.g. separate lighting circuits for separate floors? Again, if so, can I do this, or does it need to be done and/or certified by a professional?
- Perhaps I should forget the new class I fittings and just get class II light fittings and leave the wiring as is(?).
Your expert opinions welcome. Would be good to at least consider my options before getting an electrician in to have a look.
Thanks.