Geo wrote:
> You need 8mm minimum between any bare mains-connected metal and other 
> low voltage/earthy stuff.  Watch out for pcb relay bases/connectors that 
> don't have that clearance. Three mm minimum between pins (or pcb pads) 
> for the L-N.

The standoffs are 12mm, so that's 12mm from the copper side of the PCB 
to the metal casing.

The relay pins extend out 3.85mm from the base, and the PCB is 1.6mm 
thick. That leaves 2.25mm of pin sticking out, less the spacer leaves 
9.75mm of clearance. Even assuming the solder joint eats 1mm or so of 
the clearance (not that likely), there's still 8.75mm of air gap left. 
If I nipped off the tip of the pin before (or after) soldering the relay 
socket down, there's going to be a bit more clearance than that...

Just out of curiosity, would these figures change significantly if I was 
to install some form of plastic shield over the base of the PCB?

> The internal wiring does not /have/ to be in the "harmonised" colours. 
> One inside the box you can wire everything in e.g. 18 SWG BTC with heat 
> resistant sleeving.

Pardon my ignorance, but what do you mean by BTC?

Thanks,
-- 
Phil.
piclist@philpem.me.uk
http://www.philpem.me.uk/
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