On 09/06/2018 14:06, Tricky Dicky wrote:
All of which seems to be the perfect solution. Yes, three sided bent
tin chimney. Not sure why I need a separate isolation switch, but rules
is rules.

I am not so sure about the rules but every professional installation I have seen has had an easily accessible isolating switch. I suppose if an earth fault develops and the casing becomes live or something catches fire you have no means of killing the power if the only means to isolate it is behind the cowl. Maybe Adam (ARW)may have a definitive answer?

You would hope the 3A fuse blows if the cover becomes live. If not then
you are relying on the RCD to protect you.

I have seen plenty of installations where the cooker hood power is
behind the hood with no other means of isolation. It is not something I
would install that way.

As to if it complies with the regs I am not sure. I would say not best
practice but not dangerous.


--
Adam