Lead Cable

[shazbutz]

One for the memory bank! Any ideas when lead "insulated" twin and earth was used? Came across loads of it today left in situ possibly following several rewires..

 

[Knobhead]

In the 1990’s I redirected a couple of 0.3 PILCSWA cables installed in the 1930’s, they are still in uses to this day.

The IR tests came in at <1MΏ. This is a long time ago, and replacement PVC cables would then have cost £25K plus the cost of a cable gang.

So what to do?

This is something no longer in the regs and it should be!

Total leakage Ph→Ph or Ph→E is not to exceed 1/10,000[SUP]th[/SUP] of the circuit FLC.

So the circuit is fused at 300A which we use as FLC

300/10000 = 0.03A
A bit of jigging Ohms law about based on our plant voltage of 550Vgives 18.3KΏ as minimum IR value.

As I said, it’s still in use today. How many of you would have condemned the cable?
After about a year in service quite heavily loaded I tested it again >5MΏ.

 

[GLENNSPARK]

In the 1990’s I redirected a couple of 0.3 PILCSWA cables installed in the 1930’s, they are still in uses to this day.

The IR tests came in at <1MΏ. This is a long time ago, and replacement PVC cables would then have cost £25K plus the cost of a cable gang.

So what to do?

This is something no longer in the regs and it should be!

Total leakage Ph→Ph or Ph→E is not to exceed 1/10,000[SUP]th[/SUP] of the circuit FLC.

So the circuit is fused at 300A which we use as FLC

300/10000 = 0.03A
A bit of jigging Ohms law about based on our plant voltage of 550Vgives 18.3KΏ as minimum IR value.

As I said, it’s still in use today. How many of you would have condemned the cable?
After about a year in service quite heavily loaded I tested it again >5MΏ.

same goes for motors...if i remember you correctly Tony....

 

[tooleystreet]

Pvc is water proof but rubber is not. ...rodents chew through both in a matter of days....I m happy to sleeve at terminations.

 

[Knobhead]

Pvc is water proof but rubber is not. ...rodents chew through both in a matter of days....I m happy to sleeve at terminations.

 

[trev]

Pvc is water proof but rubber is not. ...

Since when?

 

[kjgreen3]

Pvc is water proof but rubber is not. ...rodents chew through both in a matter of days....I m happy to sleeve at terminations.

Its raining outside. Best get myself to kwik fit and change my vulcanised rubber tyres for some of those fancy new PVC ones........... Now where to get them from Hmmmmm.

 

[GLENNSPARK]

OK Glenn perhaps it would be fairer to say - 'conduit started losing ground to other systems'?

well a lot of council housing stock that went up in the 50s/60s used conduit...

 

[GLENNSPARK]

i think this birdy`s just gone down faster than a burst balloon Tony...

 

[tooleystreet]

No one can see pee that high up........lol[emoji148][emoji225]

 

[dazza1981]

I think its time i buggered off for a couple of weeks...... to many morans, to many part p topics where us in the know have to keep explaining to numpties it is NOT a qualification, and general crap on here lately !!!!

The pillock above sums it up really !!!

 

[Guest77]

You love it really

 

[dazza1981]

You love it really

I love learning stuff off you guys Mike and having some real electrical discussions but lately its just same old toot on here !!!
Sorry Rant over !!

 

[Guest77]

Thats because it is nearly the summer holidays and all the skill centres have been hard at work conning school leavers to take a 17 day course for 6k and they will become electricians lol, there are lots of unfortunates who will jump at that chance and it will be hectic for a month or two now lol.