Regulations for using pyro

[lau05225]

Does anyone know any regulations when using pyro? I have just to state one for college work but can't seem to find anything

 

[Sintra]

The only one i can think of is 433.1.5. Stating 1.5mm MICC cable can be used on a 32A ring final circuit.

 

[geoffa]

have a read through reg's
422 (in particular 422.2.1 and 422.6)
also, 512.2

 

[DavidJ91]

Does anyone know any regulations when using pyro? I have just to state one for college work but can't seem to find anything

I'll give it a shot:

On testing, the resistance of the insulation must be less than 500ohms and try to avoid splitting the copper sheathing. Despite pyro being known to still work even when the copper is split, it's an aesthetic/peace-of-mind issue.

 

[malcolmsanford]

Rge 543.2.2 (V)

but I do like Geoffa 412.6 which actually names MICC as an example and is the best one to use IMO

 

[malcolmsanford]

I'll give it a shot:

On testing, the resistance of the insulation must be less than 500ohms and try to avoid splitting the copper sheathing. Despite pyro being known to still work even when the copper is split, it's an aesthetic/peace-of-mind issue.

Sorry you surely mean exceed 1Mohm becasue if I got 500ohm IR then I would be looking at remaking the pot ............. and "splitting the copper sheath", you can not use a MICC if you have a split copper sheath as the magnesium powerd will absorb moisture, are you meaning PVC sheath

 

[Engineer54]

I'd actually be looking for a dammed sight more than even Malcolm's 1 Mohm, and as for using a MICC cable with it's copper sheath split, ...you must be joking, ..Right??

 

[DavidJ91]

Sorry you surely mean exceed 1Mohm becasue if I got 500ohm IR then I would be looking at remaking the pot ............. and "splitting the copper sheath", you can not use a MICC if you have a split copper sheath as the magnesium powerd will absorb moisture, are you meaning PVC sheath

I'd actually be looking for a dammed sight more than even Malcolm's 1 Mohm, and as for using a MICC cable with it's copper sheath split, ...you must be joking, ..Right??

@malcomsanford Yes, sorry I meant Mohms. Ok, I made a mistake.
I'm just a mere trainee/skivvy/learner in my first year at the moment trying to...well....learn.
Hence I came onto this forum to help me through.

@Engineer54 As for the split in the copper sheath, of course I wouldn't really use it if I was on a real job, so in that respect yes I was 'joking'. I meant that it could still read <500m.ohms in theory.

If you'll allow me to explain - I have set tasks to do in college, one of them was a pyro installation with a pot at each end plus bending both ends to a tight right-angle radius, which had to be 80mm from the bottom of the pots (which was instructed in my task booklet).

I accidentally split the copper when bending it. I didn't bend it at the right distance so then I made the schoolboy error of straightening it again to re-attempt the tight bend (which of course, led to work-hardening and then breakage). However, On testing it, it was strangely still passable as the reading was still less than 500M.ohms.

Of course I would start it again if this was a real job, but it was a task in class.
And obviously when I work with it again, I'll make sure it's not broken. But it was the bending radius I was given that broke it.

It's been a while since I worked with it so I forgot what the actual unit was on the tester.
Thank you for pointing these things out to me. Only trying to learn and remember things guys

 

[johnboy6083]

in future mate, dont ever be tempted to energise any cable that has a split sheath. you repair the split as best you can, which isnt possible with pyro in my opinion. withmost other cables, use self amalgamating tape in wet areas, or pvc tape in dry areas. if its only a small run ect then rewire it.

 

[Deleted member 26818]

How does one split the sheath in the first place?

 

[robsparky1975]

just a quick correction for you on the insulation resistance,we dont want you losing points on exams,you put down <500m ohms,change the arrow the other way >500m ohms,now your assesor knows you mean greater than,good luck

 

[Engineer54]

How does one split the sheath in the first place?

With great difficulty, or total abuse i'd say...lol!!!

 

[Guest 004]

he was bending it backwards, and then forwards, do that a few times, and of course it will snap.........

 

[malcolmsanford]

With great difficulty, or total abuse i'd say...lol!!!

I remember when doing my time, apprentice wise befor Tel starts, my sparks rigged up a light and a switch in pyro on a board, and set about it with a 2lb ball peen hammer, this pyro virtually was flat and the light still worked, and we IR it after and it was, here is one for us old.uns, the neddle never moved...........so spliting a pyro by bending must take some doing.

 

[Guest 004]

he done it at college, so it has been used hundreds of times....