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Discuss Insulation resistance test on length of SWA cable in the Industrial Electrician Talk area at ElectriciansForums.net

T

Toneyz

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Doing new supplies for a school new Shneider 3 phase & N MCCB panel board. 50mm 4 core SWA one end made off in the board earth fly lead from banjo to earth terminal. The other end gland made off in gland (fly lead not made off yet) 3 phases and neutral just hanging there. Done installation resistance test to earth at 500v got 10Mohms to earth on all phases run is about 50mtrs?
 
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littlespark

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What is it connected into at the board that’s made off? Thinking you’re reading through equipment.

Either that, or the cables damaged somewhere
 

Pete999

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Doing new supplies for a school new Shneider 3 phase & N MCCB panel board. 50mm 4 core SWA one end made off in the board earth fly lead from banjo to earth terminal. The other end gland made off in gland (fly lead not made off yet) 3 phases and neutral just hanging there. Done installation resistance test to earth at 500v got 10Mohms to earth on all phases run is about 50mtrs?
You mean INSULATION resistance test Mate surely
 
T

Toneyz

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  • #9
Has the mccb got a vgi add on the bottom?
If so you may just of nackerd it
So used to using Eaton so maybe you could let me know what this vgi is, please.
 
T

Toneyz

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  • #11
As far as I am aware it's an Earth Leakage add on block
Not as far as I know a standard MCCB they don't do them in S.P. range is NSX MLG2.2 if that helps it has CT metering but as I posted nothing on end (load)
 

Lucien Nunes

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Did you try drying the exposed surface of the insulation between the bared ends of the cores and the gland? 10MΩ could just about be caused by condensation.

I think 'vgi' should read Vigi, Schneider's trade mark for their residual current add-on actuator.
 

Pete999

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wasn't vigi the artificial intelligence in Star Trek 1?
No Tel Vger, As voyager with the oya erased after centuries of exposure to cosmic space dust and radiation, Crikey don't you anything?:tongue::);):D:rolleyes:o_O lol
 
D

Deleted member 26818

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  • #16
I would go with damp in the cable.
Especially if it’s and of reel.
 

telectrix

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Could be that Tel, as well as my unhealthy addiction to anything SI FY except Dr Who, because it's not real like Star Trek.
used to think dr. who was real till he reincarnated as a scarecrow. ( jon pertpouff as worzel gummidge ). now that's taking sci-fi too far.
 

Pete999

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used to think dr. who was real till he reincarnated as a scarecrow. ( jon pertpouff as worzel gummidge ). now that's taking sci-fi too far.
What proved it wasn't real for me was the aerodynamics of the Tardis, impossible for a shape like that to fly let alone Time Travel, ludicrous.
 

Pete999

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wrong pete. in space there is no air to cause resistance so aerodynamics is irrelevant.
Yeah forgot about that, just shows how senility can creep up on you, but the Tardis has to get from an atmosphere to the vacuum of space, so aerodynamics does play a role for part of the flight, we have to stop this discussion Tel, people will start talking, although judging from some of the comments they already have a good idea of how we think, by we, I mean the elder members.
 
D

Deleted member 26818

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  • #23
There’s no reason why the Tardic would need to fly.
Should just be able to transfer itself to any location required.
Of course the shape we see, is just camouflage, we don’t actually get to see it’s true shape.
 

Pete999

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There’s no reason why the Tardic would need to fly.
Should just be able to transfer itself to any location required.
Of course the shape we see, is just camouflage, we don’t actually get to see it’s true shape.
I can't argue that point Spin cus I don't watch it, I only like documentaries like Star Trek, Star gate etc.
You need to remember Spin lots of us oldies were brought up on carp like Dr Who, it wasn't until J.T.Kirk came along to give us a real insight as to what Space travel and ETs are really like.
 
D

Deleted member 26818

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  • #25
With all the flitting about in time Dr Who does, it’s uprising he/she doesn’t bump into him/herself more often.
 

Pete999

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With all the flitting about in time Dr Who does, it’s uprising he/she doesn’t bump into him/herself more often.
They would damage the Time Line Continuum if they did, after all there was no "Prime Directive" in the Dr's life, proving it isn't real life like what Star Trek is.
Spock is even doing Documentaries now, mind you he is a bit younger, been reincarnated I'll bet, either that or the Make up department are working wonders.
 

telectrix

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They would damage the Time Line Continuum if they did, after all there was no "Prime Directive" in the Dr's life, proving it isn't real life like what Star Trek is.
but the prime directive asserts that no interference should be made with other civilisations. that totally contravenes US foreign policy.
 

telectrix

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we already know that there is alien life form on the planet. it goes by the name of "woman", dedicated to destroy mankind. :D:D:D.
 
T

Toneyz

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  • #35
Did you try drying the exposed surface of the insulation between the bared ends of the cores and the gland? 10MΩ could just about be caused by condensation.

I think 'vgi' should read Vigi, Schneider's trade mark for their residual current add-on actuator.
I am 100% it is not condensation but thanks for the suggestion I think it has something to do with the metering as it had earth fly leads also although the new panel MCCB board main switch is off the N-E PME connection is made in the cutout.
In my mind, I think it is something to do with this as all three phases are 10M ohms to earth.
 
T

Toneyz

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  • #36
I would go with damp in the cable.
Especially if it’s and of reel.
The end was mad off into the individual cores ready to go in the schools old Square D board where the existing is.
 

Pete999

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Would it not be easier to disconnect all conductors and test the cable without the problems of metering equipment? or is there to much work involved to do this, it would prove the cables integrity throughout wouldn't it?
 
T

Toneyz

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  • #39
Thanks, Pete and Tel There are other parts of the forum its like you have both hijacked the post to talk about something else some people are trying to give a constructive reason. I am all for having a bit of banter but every time I post a thread up on the forum it gets deliberately taken off topic or daft photos.
 

Rpa07

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I knew Anthony would SHOUT at some point - that was true Hijacking!
I agree with Pete and complete disconnection for true reading otherwise you’ll be wasting precious time.
 

telectrix

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Thanks, Pete and Tel There are other parts of the forum its like you have both hijacked the post to talk about something else some people are trying to give a constructive reason. I am all for having a bit of banter but every time I post a thread up on the forum it gets deliberately taken off topic or daft photos.
but the OP question has already been answered, so .......
 

Pete999

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Thanks, Pete and Tel There are other parts of the forum its like you have both hijacked the post to talk about something else some people are trying to give a constructive reason. I am all for having a bit of banter but every time I post a thread up on the forum it gets deliberately taken off topic or daft photos.
Not true Ant I gave you a perfectly good test procedure, and I don't think anyone has high jacked your post. Least of all me and all the others, just a bit of fun on a Sat morning.
 
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T

Toneyz

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  • #43
I knew Anthony would SHOUT at some point - that was true Hijacking!
I agree with Pete and complete disconnection for true reading otherwise you’ll be wasting precious time.
It was only a quick test and did R1 + R2 could not work out why but my gut feeling is the PME and metering. I hope we don't have to fit a lot of these PITA as you have to wire everything for the metering and that even by Schneiders own Tech dept.
 

telectrix

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somebody mentioned viga. that was good enough. if they's have said "viagra" then that would have taken the thread in a totally new erection direction.
 

TJ Anderson

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So what was the reason Tel?
It's gotta be worth just disconnecting the conductors to prove it and carrying out an IR on the cable only.

If the cable tests clear, then for your own interest, IR test the equipment you have disconnected l&n to earth at 250v test voltage. That way you won't damaging anything and you will find out what is giving you that reading.
 

TJ Anderson

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So what was the reason Tel?
As Pete said, It's gotta be worth just disconnecting the conductors to prove it and carrying out an IR on the cable only.

If the cable tests clear, then for your own interest, IR test the equipment you have disconnected l&n to earth at 250v test voltage. That way you won't damaging anything and you will find out what is giving you that reading.
 
T

Toneyz

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  • #49
My initial thoughts were to disconnect but being that we were in a school it was difficult to leave doors unlocked while I got a wrench.
Does anyone have any experience with these Schneider MCCB boards you install the MCCB and tighten it and the head snaps off can you get these MCCB's out again and reinstall?
 

TJ Anderson

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My initial thoughts were to disconnect but being that we were in a school it was difficult to leave doors unlocked while I got a wrench.
Does anyone have any experience with these Schneider MCCB boards you install the MCCB and tighten it and the head snaps off can you get these MCCB's out again and reinstall?
Yes, you can redo them. They set correct torque when they snap off the first time. Same as the old MCCB's in Merlin Gerin Panel Boards. You need a 17mm metric socket to undo it, and a torque wrench when you do it back up. What size MCCB is it?
 
Ive seen similar on a new install on a treatment works. Turned out that a thin piece of masking type tape had been put across the top of the isolator (to avoid anything dropping in I suppose) which hadn't been removed when cable was installed. It tracked just enough to give a less than satisfactory IR reading but not enough for dead short.
 

ipf

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Ive seen similar on a new install on a treatment works. Turned out that a thin piece of masking type tape had been put across the top of the isolator (to avoid anything dropping in I suppose) which hadn't been removed when cable was installed. It tracked just enough to give a less than satisfactory IR reading but not enough for dead short.
Had it been energized previously or were you doing the initial test? If you were, as you obviously know, that shows up a good reason for initial testing ......if not, someone slipped up badly, as you also know. It's a bit rough, though...…...or rouge, as one well known poster might say.;)
 
Had it been energized previously or were you doing the initial test? If you were, as you obviously know, that shows up a good reason for initial testing ......if not, someone slipped up badly, as you also know.

Initial testing stage, far from being energised at that point. As you say though, highlights why the tests are so important
 

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