NAPIT Certification Scheme An interesting exchange today with Contactum, IET & NAPIT

[netblindpaul]

It won't work for me, I'll try to re-start the browser in a bit, doing something in another tab @ the moment so can't close it.

 

[ipf]

Had a conversation at wholesalers today. They are stopping providing the old CU's. New wylex m/clad 10w HI £80 without breakers.
Wylex 40mm gland for tails £10, others available for £5. Some sort of sealed unit for rear incorporating glands £30....so we're talking something like £160 for a complete unit. Double the cost.
Looks like there's not going to be much choice. Short and curlies, eh? Ridiculous!!

 

[Darkwood]

Had a conversation at wholesalers today. They are stopping providing the old CU's. New wylex m/clad 10w HI £80 without breakers.
Wylex 40mm gland for tails £10, others available for £5. Some sort of sealed unit for rear incorporating glands £30....so we're talking something like £160 for a complete unit. Double the cost.
Looks like there's not going to be much choice. Short and curlies, eh? Ridiculous!!

Just fitted a metal wylex split board for less than £120 in parts - 8 x mcb and a 40mm stuffing gland, you're getting ripped if its £160 the wholesaler was even taking about a fully loaded soon for less than £100 so not sure where your getting yours from.

 

[netblindpaul]

Why are the wholesalers stopping supplying the plastic CU's when they are OK anywhere except domestic?

Oh and re-starting the browser sorted the pic issue!

 

[shanky887614]

Until you drop it!

are you sure www.youtube.com/watch?v=12OSBJwogFc

 

[Darkwood]

are you sure www.youtube.com/watch?v=12OSBJwogFc

The issue with glass of most kinds is it stresses easily with heat so focus the heat in one spot it usually shatters .... not enough info in the link but totally respect your response lol

 

[ipf]

Just fitted a metal wylex split board for less than £120 in parts - 8 x mcb and a 40mm stuffing gland, you're getting ripped if its £160 the wholesaler was even taking about a fully loaded soon for less than £100 so not sure where your getting yours from.

Not even thinking about installing yet....just a passing chat...so not getting ripped off. Yet, anyway.:wink_smile:

 

[HappyHippyDad]

So basically Contactum dont know what materials can be used!

But how could they when the new regulation is ambiguous?

I shall be adhering to the second clause of enclosing my plastic CU in a suitable enclosure. I shall basically wrap the CU in Ceramic Fibre Wool High-temperature insulation wool - Wikipedia, the free encyclopedia

It could be classed as an enclosure and it can take temperatures over 1000degrees and complies with reg 132.12, just another example of this regulation needing to be tidied up a bit!

 

[Deleted member 72666]

The issue with glass of most kinds is it stresses easily with heat so focus the heat in one spot it usually shatters .... not enough info in the link but totally respect your response lol

Borosilicate could be the answer!

 

[SPARTYKUS]

Borosilicate could be the answer!

Had to look that up. Interesting. Pyrex is made from it. 1648 degrees Celsius. Should do

 

[Darkwood]

Yes we have oven ready Pyrex glass ... but you missed my key point, if you heat up only one spot of glass the stresses between the hot and cold areas can cause it to shatter, fracture, crack etc ... oven glassware is heated up more or less evenly so little issue but car windscreen are a good example for shattering or cracking when you poor boiling water on it to melt the ice. The link gave limited info on properties of the glass so may not be suitable or even cost effective.
Just look up exploding pyrex dishes etc ..consumers ignoring usage warning and putting a hot dish under a cold running tap is one way to achieve this.

Glass is an insulator so is prone to temp' differential stress where as metal is a good heat conductor and doesn't shatter with high temperature gradiants across its surface.

 

[Deleted member 72666]

Yes we have oven ready Pyrex glass ... but you missed my key point, if you heat up only one spot of glass the stresses between the hot and cold areas can cause it to shatter, fracture, crack etc ... oven glassware is heated up more or less evenly so little issue but car windscreen are a good example for shattering or cracking when you poor boiling water on it to melt the ice. The link gave limited info on properties of the glass so may not be suitable or even cost effective.
Just look up exploding pyrex dishes etc ..consumers ignoring usage warning and putting a hot dish under a cold running tap is one way to achieve this.

Glass is an insulator so is prone to temp' differential stress where as metal is a good heat conductor and doesn't shatter with high temperature gradiants across its surface.

I believe the issues with 'exploding' pyrex were down to using inferior tempered soda-lime glass instead of borosilicate which incidentally most laboratory glassware is made from.
I wasn't being serious as I'm sure Tel wasn't when he suggested glass being used for cu's but the more I think about it the more I'm 'warming' to the idea.

 

[Darkwood]

I believe the issues with 'exploding' pyrex were down to using inferior tempered soda-lime glass instead of borosilicate which incidentally most laboratory glassware is made from.
I wasn't being serious as I'm sure Tel wasn't when he suggested glass being used for cu's but the more I think about it the more I'm 'warming' to the idea.

Having said that we do have lab gear as you say where you have a burner under the glass although at what sacrifice to other properties ? ... maybe you could get a patent going for see-through switch gear ..however ugly seeing the mess of wires inside might be

 

[shanky887614]

Yes we have oven ready Pyrex glass ... but you missed my key point, if you heat up only one spot of glass the stresses between the hot and cold areas can cause it to shatter, fracture, crack etc ... oven glassware is heated up more or less evenly so little issue but car windscreen are a good example for shattering or cracking when you poor boiling water on it to melt the ice. The link gave limited info on properties of the glass so may not be suitable or even cost effective.
Just look up exploding pyrex dishes etc ..consumers ignoring usage warning and putting a hot dish under a cold running tap is one way to achieve this.

Glass is an insulator so is prone to temp' differential stress where as metal is a good heat conductor and doesn't shatter with high temperature gradiants across its surface.

true, did you look at part2 its very interesting

 

[SPARTYKUS]

As title says:

View attachment 29052

hilarious. Doggedly sticking to their lines.... "No, no, not listening, no, no, i hear the voices but Im not listening"