direct burial cable - not in conduit- also 2 wires in a breaker's lug ???

[1capybara]

Is SWA [BS5467] the only type BS or CE or IEC cable that I can direct bury -
not in conduit?
also: is there anything in 17th edition that says I cant put 2 wires in a breaker's
lug if they fit?

 

[DurhamSparky]

2 wire = yeah do what ever!! not unknown to have 3-4 wires poked in!!
swa can be direct burried as it has Metal amour for mechanical damage! all other pvc cables need to be in a steel conduit or protected by some thing for mechanical damage!! etc...!

 

[chris260364]

conduit is'nt realy the way to go.
Cheaper and better job in SWA
AS for the 2 wire thing , if it's an existing board and you have worked out the potential loading then ok

 

[malcolmsanford]

You can in theory bury MICC as it is impervious to moisture and regarded as mechanically protected as the copper outer is earthed, but the best way is still SWA IMO

 

[telectrix]

You can in theory bury MICC as it is impervious to moisture and regarded as mechanically protected as the copper outer is earthed, but the best way is still SWA IMO

better than a bit of T/E or flex, but less fun when next door's cat scratches in your garden.

 

[malcolmsanford]

better than a bit of T/E or flex, but less fun when next door's cat scratches in your garden.

Seen loads of old sheds over the years fed by Pyro and quite a lot of commercial stuff as well. I use to do a lot of NCP car parks and most of the circuits underground was direct buried Pyro.

Seems it as gone out of fashion but I think it's a great cable. fireproof, buriable, economic in many ways as no need for seperate CPC in a lot of cases, a smaller CSA can be used than normal PVC cable when PVC was susceptible to UV pyro could be run surface outside, and it looks really neat done properly.

Bring it back I say.

 

[chris260364]

You could do it in mineral
just cost more and be weaker though

 

[IQ Electrical]

Seen loads of old sheds over the years fed by Pyro and quite a lot of commercial stuff as well. I use to do a lot of NCP car parks and most of the circuits underground was direct buried Pyro.

Seems it as gone out of fashion but I think it's a great cable. fireproof, buriable, economic in many ways as no need for seperate CPC in a lot of cases, a smaller CSA can be used than normal PVC cable when PVC was susceptible to UV pyro could be run surface outside, and it looks really neat done properly.

Bring it back I say.

Just a struggle to find anyone capable of terminating it these days!

 

[chris260364]

Yes and that as well , I was called onto an agency 'pyro job' a few years back
turned out to be 4 ends !
got other work after though from them so it was'nt a complete waste of time !
True a lot of guys get in a pickle with a joystripper and the dressing is'nt always what you'ld hoped for !
suppose thats why it's not spec'd much anymore
its all FP mostly now is'nt it (which any monkey can do )

 

[malcolmsanford]

Just a struggle to find anyone capable of terminating it these days!

Ahhh yes mate still got all the terminating tools tucked away waiting for the day it comes back into fashion. Not sure if the sealing compound will be of much use now after about 7 years the garage .................

 

[Des 56]

Seen loads of old sheds over the years fed by Pyro and quite a lot of commercial stuff as well. I use to do a lot of NCP car parks and most of the circuits underground was direct buried Pyro.

Seems it as gone out of fashion but I think it's a great cable. fireproof, buriable, economic in many ways as no need for seperate CPC in a lot of cases, a smaller CSA can be used than normal PVC cable when PVC was susceptible to UV pyro could be run surface outside, and it looks really neat done properly.

Bring it back I say.

Thats it then,the campaign for pyro begins here

I haven't had much call for installing it since the last boiler room I did
I ripped some out on what must have been a demonstration 3 story council house last year
It was a full system theoughout,clipped extra neat, even under the floors,I have never seen a full domestic install in pyro previously,it was neat and meticulously installed,the dist board even outdated me
It would be interesting to watch some of the new breed rolling dressing and making off the pyro
It would be nice to see the techniques they would get up to. if they were given just a pair of cutters to strip it
I still have all the gear,the blade on the stripping tool would have corroded away by now though
Did any of you ever use the heater contraption they brought out to replace the pot and compound ?
I dont think they lasted or caught on in the end

 

[1capybara]

conduit is'nt realy the way to go.
Cheaper and better job in SWA
AS for the 2 wire thing , if it's an existing board and you have worked out the potential loading then ok

as for 2 wire in a breakers lug, is there anything in 17th ed which says it isnt allowed?
this is for new construction, not pre-existing work. what do you think ???

 

[Des 56]

as for 2 wire in a breakers lug, is there anything in 17th ed which says it isnt allowed?
this is for new construction, not pre-existing work. what do you think ???

If that were the case the argument around radial or ring would be finished
Ring main starts and ends at the board terminating in one mcb,it might even have the permited spur direct from that mcb,so we are up to three at least

 

[malcolmsanford]

As I was left handed I could never get the hang of a stripper so it was always side cutters for me, I still could do a set of tails for a DB in about 4-6 minutes with cutters.

Your right dressed there is nothing like it. The best I did was a 17 done in a bank of 3x5 and the other 2 run under it, all with a toffee hammer and a bit of 2" x 1" cut just short of the gap between saddles, happy days.

No never used the heat method but in the late seventies they brought out a compression tool that instead of scewing down onto the pot it compressed it like a pliers. It had a little push out attachment at it's jaws for different sized pots. I remember buying it , over 30 quid, a weeks wages then, but great bit of kit and i've lost it over the years, or more to the point can't find it.

 

[pushrod]

If that were the case the argument around radial or ring would be finished
Ring main starts and ends at the board terminating in one mcb,it might even have the permited spur direct from that mcb,so we are up to three at least

Spoke to a chap at the IEE the other day about something similar to this - was putting a light in the cupboard under the stairs beside the CU and just putting it in beside the existing downstairs lighting on the same 6A mcb. I had assumed it would just be a meiwc but he said it would count as a new circuit! So what would you give for a spur at the origin on a ring or radial, minor works or eic??