Zone 1.

Ref. the low metal light bar in zone 1 immediately above the metal bath, which is supplied by metal pipes to the taps……

What is the user risk regarding simultaneous contact of the bath/taps and metal light bar if the light bar is Class 2 but electrically leaky. That is one reason why I considered supplementary bonding.

The crux of the matter is: Just how does a metal lighting product comply if it boasts “suitable for Zone 1 installation?"

Is it just made to keep water and steam out, and/or comply with certain electrical standards of high insulation and quality standards?

The light bar immediately above the bath inviting adjustment by a bather is like this model

Z.

The idea behind class 2 appliances is that it is extremely unlikely that they can become “electrically leaky”, Z. Going down that path will fry your brain. Everything is dangerous, you had better live in a cave, or perhaps not. Certainly, you should not use the roads!

As a general principle, earthing metalwork on Class II appliances causes more problems than it solves. On of the big advantages of Class II is that it can't import nasty voltages from elsewhere in the installation. Earth it and you loose that advantage and the resulting risk can't entirely be eliminated by supplementary bonding.

Any Class II appliance should have sufficient ‘creepage and clearance’ distances between live parts and anything else that leakage currents to exposed metalwork should be tiny even if it does gets damp.

   - Andy.

davezawadi (David Stone): 
 

The idea behind class 2 appliances is that it is extremely unlikely that they can become “electrically leaky”, Z. Going down that path will fry your brain. Everything is dangerous, you had better live in a cave, or perhaps not. Certainly, you should not use the roads!

I recall the wise words of Fred Ethellthwaite some years ago from Brandsby in Yorkshire. “Best set yon pressure release rite before the bu**er blows yer brains to 'ell”

A professional and serious drinker Fred, he liked Old Peculiar beer, and a pipeful of exotic weed, especially when driving his steam engine at ploughing matches.

His sentiment was to engineer out any risks if possible before disaster happened. He was criticised in the Northern Gazette once for diverting the engine through Pets' Corner and the Petting Zoo at a children's event.

R.I.P Fred. (Sod those weak rivets.)

Z.

Are you sure you are not making that up ? I'd be surprised the Northern Gazette, being based in Stockton (kind of Tees-side but covering Middlesborough and Hartlepoole for the southerners) condescended to cover anything as far south as Yorkshire at all.  That and being out of print for about 50 years. Easingwold area is of course north of York, but not by much.

Mike.

mapj1: 
 

Are you sure you are not making that up ? I'd be surprised the Northern Gazette, being based in Stockton (kind of Tees-side but covering Middlesborough and Hartlepoole for the southerners) condescended to cover anything as far south as Yorkshire at all.  That and being out of print for about 50 years. Easingwold area is of course north of York, but not by much.

Mike.

The Northern Gazette was an organ that sometimes covered news from abroad, along with stuff about ferrets and pigeons. Anyway I mentioned Brandsby with the famous bank not Easingwold Mike. I can see on an online map that there is a radio station at Brandby now called Yowah Radio.

Z.

AJJewsbury: 
 

How does the general situation measure up to 701.415.2 (iv) to (vi)?

  - Andy.

Yes it does need supplementary bonding as it fails on (v) above, as the circuit has a 100mA R.C.D. and not a 30 mA R.C.D. protecting it.

Thanks Andy.

Z.

AJJewsbury: 
 

As a general principle, earthing metalwork on Class II appliances causes more problems than it solves. On of the big advantages of Class II is that it can't import nasty voltages from elsewhere in the installation. Earth it and you loose that advantage and the resulting risk can't entirely be eliminated by supplementary bonding.

Any Class II appliance should have sufficient ‘creepage and clearance’ distances between live parts and anything else that leakage currents to exposed metalwork should be tiny even if it does gets damp.

   - Andy.

So, why does the first paragraph in 701.415.2 require supplementary bonding to the C.P.C. supplying Class 1 and Class II equipment?

Z.

Zoomup: 
 

This forum is losing the professionalism more worthy of t*itter at times; again this is advertising! 

Jaymack

So, why does the first paragraph in 701.415.2 require supplementary bonding to the C.P.C. supplying Class 1 and Class II equipment?

That way the exposed metalwork of Class I appliances is bonded, the metalwork of Class II appliances isn't (thus maintaining the advantages of Class II not importing fault voltages), but should the householder change a Class II fitting for a Class I one, the new exposed metalwork is included in the bonding.

 So basically the same logic as running a c.p.c. to Class II equipment (even though it obviously doesn't need it) - see note to 412.2.3.2.

   - Andy.