D.I. tails entry to c/u.

[Soulsurfer]

Hey all, regarding the entry of d.i. meter tails into a consumer unit I was called to a recent job to quote for a few alterations and people have just moved in, informed me just before they bought that new consumer unit had been fitted etc.. all looks o.k. but meter tails and main earth have been brought in through a 32mm compression gland / rubber packed, and all t & e's through opened knockout and just grommet strip on top of casing. I am doing a new unit on another job soon and local dno are saying just a standard plastic gland is fine ! I'm thinking what's the point of say Wiska sprint metal glands made for Amendment 3 or intumescent sealants if the dno is saying don't need to ? Those glands aren't cheap and customers want cheap as possible of late !

Rather not leave my work open to problems if not maintaining non-combustible ratings, any opinions ?

 

[Leesparkykent]

So what does OP mean??

Opening post or original poster.

 

[stevethesparks]

if we wanted to be really silly a length of singles buried in glass fire would also be double insulated - just different types of insulation.

 

[Deleted member 9648]

Might I suggest just drawing a double insulated symbol on your tails with a pen......officially double insulated then,job done.

 

[netblindpaul]

DW,
There are only two kinds of properties the sheath can have, mechanical or electrical.
You can bring in any other terms you desire, but the protection boils down to it being mechanical for the insulation.
After all the electrical properties rely on mechanical characteristics.
So, I stand by my comment the sheath is for mechanical protection only.
Environmental damage causes mechanical deterioration in the sheath, thus it is therefore mechanical protection.
So as I have already said, we are going to have to agree to disagree.
Again, I stand by my comment, the sheath is only mechanical protection, whatever else you call it, it provides mechanical protection for the insulation.
It has no other purpose than to protect the primary insulation against mechanical damage which would compromise its electrical properties, howsoever caused.
So, I feel that my comments and terms are perfectly accurate.

 

[DPG]

Is this the 5 minute argument or the 10 minute argument?

 

[GMES]

Did this really start over a bloody Gland, what is it with you Domestic lads you're tighter than Nuns ........ buy the part put your profit on then charge it to the customer.
I'm glad I don't do Domestic jeez 3 pages I say 3 pages :tounge_smile::tounge_smile:

 

[davesparks]

Did this really start over a bloody Gland, what is it with you Domestic lads you're tighter than Nuns ........ buy the part put your profit on then charge it to the customer.
I'm glad I don't do Domestic jeez 3 pages I say 3 pages :tounge_smile::tounge_smile:

Not just any gland, it's a super amazing don't really need it at all gland that these newly invented metal boards need!

After all, nobody has ever installed a metal board without using a super amazing gland with three holes in it have they?

 

[Andy78]

Male bush, lockring, and female bush was good enough for me today.

 

[Darkwood]

DW,
There are only two kinds of properties the sheath can have, mechanical or electrical.
You can bring in any other terms you desire, but the protection boils down to it being mechanical for the insulation.
After all the electrical properties rely on mechanical characteristics.
So, I stand by my comment the sheath is for mechanical protection only.
Environmental damage causes mechanical deterioration in the sheath, thus it is therefore mechanical protection.
So as I have already said, we are going to have to agree to disagree.
Again, I stand by my comment, the sheath is only mechanical protection, whatever else you call it, it provides mechanical protection for the insulation.
It has no other purpose than to protect the primary insulation against mechanical damage which would compromise its electrical properties, howsoever caused.
So, I feel that my comments and terms are perfectly accurate.

I see you angle now, your using the generic term for mechanical barrier, the same that you skin is against the everyday nasties you may come into contact with. I can totally agree with you in that aspect and the only reason I contend it is that we were taught not to use the term mechanical barrier as this can often be misinterpreted hence we were always given the term environmental barrier/protection to use, it is also often used as a reference in the BS7671 in various sections ... on that note I'll agree to agree with a little disagreement on the side due to my teachings.

PS - The mechanical strength of a sheath against physical damage is also one of its attributes, physical and mechanical strength are words with very similar meanings and often get interchanged thus we were taught to use the broader term Environmental protection/barrier, this way no confusion.

 

[Darkwood]

Did this really start over a bloody Gland, what is it with you Domestic lads you're tighter than Nuns ........ buy the part put your profit on then charge it to the customer.
I'm glad I don't do Domestic jeez 3 pages I say 3 pages :tounge_smile::tounge_smile:

The OP's question was fully answered on page 1, the rest is just the regulars debating although slightly off topic lol

 

[UNG]

This Ammendment 3 crap with metal enclosures is all down to the quality of the product lowering over the last 2 decades coupled with the training standards of those fitting them been lower, CU fires was a rarity tbh pre-90s and the boards were made out of wood quite often.

Cu fires are still a rarity except for London if they used the national stats in their presentations instead of the LFB ones they would not be able to justify the amendment 3 change. The product worked the quality of those is installing is what has changed IMO

This Amm'3 is just a knee jerk reaction to try pick up the pieces of relaxed regulations and lowered educational standards, so on that note, as long as the cables are suitably clamped and the terminations tight then a compression gland is fine, btw the Nylon glands are fire resistant and low smoke too so I cannot see the issue.

These new Amm3 glands are jumping on the fear wagon of all the confusion about what is required so yes I agree, what is the point in these metal glands.

It's a knee jerk reaction that has got a lot of people acting like headless chickens

Trouble is the difficulty people have understanding the spec of the different materials available not helped by the IET and the manufacturers peddling a metal only attitude

 

[sparksburnout]

The sheath on modern cables is ---- anyway, I put a pencil through one the other day.

 

[Deleted member 9648]

The sheath on modern cables is ---- anyway, I put a pencil through one the other day.

A pencil going through a sheath can have long term consequences.....

 

[YoungScud]

A pencil going through a sheath can have long term consequences.....

...especially if you're wearing it at the time.