IR testing

[Pete999]

Now that I'm a retired Electrician with nothing to do other than annoy Forum members with inane posts, and browse the net.
I came across some American videos about MICC installations, and having worked in the states on many occasions I found 1 vid rather interesting, a guy "Russ La Blance code violations" Russ was testin IR on a 2 core MICC cable and referred to the minimum Meg Ohm reading between the cores and the cores to Earth as 100 Meg Ohm, anyone got any thoughts, just interested that's all, as most of the American Sparks I worked with just did the bang test," would love to hear any thoughts from any of our American members as well, another inane post, sorry

 

[Lucien Nunes]

I can't see how anyone would want to work MI without doing IR tests. Even though they get away with just the bang test on PVC & XLPE cables, which are usually either shorted or not, surely it would be in the interests of the wireman to test MI as he goes, to identify any bad seals, wet cable ends that weren't adequately pared back etc. There are more variables in MI until it tests good.

 

[davesparks]

I too have watched a good few American MI termination vids, the ones which use tape and heatshrink instead of a pot and seal are particularly hilarious.
I wonder if the 100meg value you saw was a misinterpretation of the suggested value of 100meg which appears in the pyrotenax instructions?

 

[Pete999]

I too have watched a good few American MI termination vids, the ones which use tape and heatshrink instead of a pot and seal are particularly hilarious.
I wonder if the 100meg value you saw was a misinterpretation of the suggested value of 100meg which appears in the pyrotenax instructions?

May have been what the presenter saw, but 100 Meg was what was mentioned

 

[Deleted member 9648]

It's a long time since I've worked with pyro, but back in the 80's nearly all of our work was local authority and was either pyro or steel. Cables were always IR tested before and after sealing and readings were expected to be 'infinity'...which equated to the highest reading the meter would record.
If I was testing new pyro now I would expect the same, as an installation with a lot of pyro's all reading a less than very high IR would result in a unacceptably low global reading.

 

[malcolmsanford]

WP that is exactly what I did. When you "Meggered" the ends it was always "infinity"

Reading this, strange how you remember things like when installing the pyro you always cut the first 6" off the coil because of moisture weep.

Cutting a lump of 2 x 1 the size of your hammer shank, as that was the disance between the clips, so you could dress it

Forming "p" clips into saddles so you can run 2 or 3 cables together

 

[bf03yvd]

Now that I'm a retired Electrician with nothing to do other than annoy Forum members with inane posts, and browse the net.
I came across some American videos about MICC installations, and having worked in the states on many occasions I found 1 vid rather interesting, a guy "Russ La Blance code violations" Russ was testin IR on a 2 core MICC cable and referred to the minimum Meg Ohm reading between the cores and the cores to Earth as 100 Meg Ohm, anyone got any thoughts, just interested that's all, as most of the American Sparks I worked with just did the bang test," would love to hear any thoughts from any of our American members as well, another inane post, sorry

I thought sparkies never retired.

 

[Pete999]

I thought sparkies never retired.

They do when their knees, hips and elbows don't work, your back can't bend much more than 30degrees, you get dizzy when you get up to quickly, I could go on but I may start sobbing lol

 

[ruston]

Lol. It catches up all at once doesn't it.

 

[Pete999]

Lol. It catches up all at once doesn't it.

certainly does

 

[ruston]

You just get to the point when you know it is not going to go away this time.

 

[ipf]

You just get to the point when you know it is not going to go away this time.

In years gone by you could have stuck to 'Forming "p" clips into saddles so you can run 2 or 3 cables together'

 

[ipf]

WP that is exactly what I did. When you "Meggered" the ends it was always "infinity"

Reading this, strange how you remember things like when installing the pyro you always cut the first 6" off the coil because of moisture weep.

Cutting a lump of 2 x 1 the size of your hammer shank, as that was the disance between the clips, so you could dress it

Forming "p" clips into saddles so you can run 2 or 3 cables together

Or even making multi clips from copper, insulated strip.

My claw hammer handle really dressed well.... along with being a measuring stick.

How I wish I'd have had my mobile for photos 30/40 years back....some of those multi cable trays.

 

[Toonlad]

lets not forget using the plumbers blow torch to dry the Pyro out,,,, Ive even put 110v through the cables to get the dampness out.. lots of things we cant do now lol

 

[PEG]

lets not forget using the plumbers blow torch to dry the Pyro out,,,, Ive even put 110v through the cables to get the dampness out.. lots of things we cant do now lol

I disagree. I still find myself doing plenty of tricks,which hark to an earlier period...

You just dare not pass it on,explain it,back it with a reg...or...say it on a forum! :aureola: