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Discuss Plastic versas Metal CU's - your chance to vote in the UK Electrical Forum area at ElectriciansForums.net

Funny how things turn full circle given time.

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That Wylex CU in all it's different configurations was revolutionary when they first hit the market in the early 50's!!

I'd like to see what happens to the frame when tested with this 960'C test wire, because i've tried to burn this treated and matured hardwood frame in the past.... Unless this wood was in constant contact with the red hot burning embers on the fire, there was no chance, and even then was reluctant to continue burning, preferring to glow and carbonise than to burst into flames!!!
 
That Wylex CU in all it's different configurations was revolutionary when they first hit the market in the early 50's!!

I'd like to see what happens to the frame when tested with this 960'C test wire, because i've tried to burn this treated and matured hardwood frame in the past.... Unless this wood was in constant contact with the red hot burning embers on the fire, there was no chance, and even then was reluctant to continue burning, preferring to glow and carbonise than to burst into flames!!!

I do not know the test setup for the glow wire test ... but if the wire were only held at one end I expect it might bend. Testing modern plastic enclosures @ 960°C must be like putting a hot knife through butter!
 
I do not know the test setup for the glow wire test ... but if the wire were only held at one end I expect it might bend. Testing modern plastic enclosures @ 960°C must be like putting a hot knife through butter!

So Maybe those old wood frame Wylex boards could still pass the Amd 3 tests then... lol!! The internals and the original covers were made of a bakelite material, so they would definitely stand up to the 960'C Glow Wire test....
 
That Wylex CU in all it's different configurations was revolutionary when they first hit the market in the early 50's!!

I'd like to see what happens to the frame when tested with this 960'C test wire, because i've tried to burn this treated and matured hardwood frame in the past.... Unless this wood was in constant contact with the red hot burning embers on the fire, there was no chance, and even then was reluctant to continue burning, preferring to glow and carbonise than to burst into flames!!!


Ha. Wouldn't that be ironic if it did pass.
 
Ha. Wouldn't that be ironic if it did pass.

I'm thinking the only place where it would fail (relating to the Amd -3 enclosure requirements) is it being an open back design, ...but then if the material it was mounted to was also proven to be non combustible, ...then maybe!! lol!!
 
So Maybe those old wood frame Wylex boards could still pass the Amd 3 tests then... lol!! The internals and the original covers were made of a bakelite material, so they would definitely stand up to the 960'C Glow Wire test....

It would not surprise me if they did via the non-combustible route according to the test criteria that Damien published. Therefore another example of 'non-combustible' according to the relevant standard. I find it hard to believe that a 'glowing wire' can concentrate sufficient energy at its tip or even along its length to ignite solid timber.
 
It would not surprise me if they did via the non-combustible route according to the test criteria that Damien published. Therefore another example of 'non-combustible' according to the relevant standard. I find it hard to believe that a 'glowing wire' can concentrate sufficient energy at its tip or even along its length to ignite solid timber.

The 960°C test is three turns of nichrome wire wrapped around the test piece. The rest I’d have to look up regarding time, wire spacing and test piece size.
 
Excellent.

yes I am not sure about Bakelite and when you can safely assume it will ignite or is damaged by heat. It being a thermoset and all.
 

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