Grommets or conduit in metal back boxes?

[gembrain]

I've seen a few comments on failed installs because of lack of grommets - although apparently not a specific requirement as such.

Is oval conduit plastered into chase and fed a little into the back box OK or does one HAVE to cut it just short of the the box and fit a grommet?

Granted it's a sharp edge but where the cable comes in at the top of the conduit is the same.

Thanks

 

[valleybilly]

I'm struggling to think of one type of installation where a metal knockout box designed for domestic installations can be used without a rubber grommet with single pvc cables going into it, if using single pvc cables then conduit would be used to connect to the box and therefore the cables would be protected from the metal hole by a coupler, interested to hear where a single cable entering a metal box could be used without any protection??

Thats due to you replying to a completly different answer

- - - Updated - - -

not always

 

[MDJ]

Thats due to you replying to a completly different answer

umm, no, you said single cables entering, I said I can't think of one installation method which would allow that, and even if the cable is PVC/PVC a grommet is the proper way, come on now you know were right, give it up lol

 

[Hants-Spark]

Thats due to you replying to a completly different answer

- - - Updated - - -

not always

Just out of curiosity what question was MDJ answering then if it wasn't the one you posed, I've re-read the thread and it all flows through to the same thing, cables entering a box either via a grommit as has been said or your way which says otherwise??

 

[markythesparky]

MDJ, i think he's on the ropes! ;-)

 

[valleybilly]

Dependant with whom you are reg'd with im sure your answer will be differant ,


If you don't use em the part p police will take you away , NOT ! lol.

 

[MDJ]

Dependant with whom you are reg'd with im sure your answer will be differant ,


If you don't use em the part p police will take you away , NOT ! lol.

None of the scams will recommend running single cables without protection into metal knockout boxes direct without any protection, it just cannot happen, against all regs, single cables are usually run in plastic or metal conduit, sometimes if they are double insulated they can be run otherwise but protection into a metal enclosure would be expected by any professional.

 

[Hants-Spark]

Dependant with whom you are reg'd with im sure your answer will be differant ,


If you don't use em the part p police will take you away , NOT ! lol.

Didn't mention being taken away, although my wife would no dount be a happier women it was given as a non-compliance and needed rectifying before I was passed

 

[pennywise]

I use 20mm PVC conduit and couplers with male bushes, no need for grommets and easy to pull additional switch lines down if customer changes there mind.

 

[valleybilly]

Just out of curiosity what question was MDJ answering then if it wasn't the one you posed, I've re-read the thread and it all flows through to the same thing, cables entering a box either via a grommit as has been said or your way which says otherwise??

As long as the wire has its double insulation intact & going into the metal back box no grommits are needed .

Singles (which dont have double insulation ) then grommits or other methods may be used .

 

[Hants-Spark]

As long as the wire has its double insulation intact & going into the metal back box no grommits are needed .
And this is what your Elecsa assessor said to you? Because mine gave me a non-compliance and said I need to rectify before passing.

Singles (which dont have double insulation ) then grommits or other methods may be used .

I beleive MDJ was asking for an example when you would use singles within a domestic installation not installed within conduit and just entering a metal box without a metal bush etc? MDJ can correct me if I'm wrong

 

[amo]

always use oval conduit in chases and grommets on all backboxes, just good practice really imo.

 

[MDJ]

I beleive MDJ was asking for an example when you would use singles within a domestic installation not installed within conduit and just entering a metal box without a metal bush etc? MDJ can correct me if I'm wrong

Your quite right, just re read his posts ha ha

 

[Thefailsafe2012]

Could do, but i would imagine that by including conduit fittings your going to reduce the internal diameter of the conduit at the ends. That will also introduce a snagging element when pushing T&E cables down the conduit!!

Ugh agreed, whats the point of running 25mm conny if it gets reduced down to 19mm by the time you've put an adapter on it, granted some makes are better than others but its still a pain!

 

[Marvo]

Only ever used round conduit and male adapters or glands/brass bushes if there's no conduit involved. I've never used grommets, I dislike them because they're prone to coming out of place. We don't really get the oval conduit here but if I was using it and there's no male adapters available for it I'd probably run it 10mm inside the backbox rather than cutting it short and using a grommet. The male adapters we use don't reduce the ID of the conduit or cause a restriction.

 

[Dcf]

I use grommet strip rather than grommets. It stays in better than the crap grommets you get these days,which fall out as soon as you push a socket back.
Most common fault of neutral earth faults I've found is no grommets on a socket box cables pushed back and crushed on the edge of the hole

 

[valleybilly]

I beleive MDJ was asking for an example when you would use singles within a domestic installation not installed within conduit and just entering a metal box without a metal bush etc? MDJ can correct me if I'm wrong

As long as the wire has its (double insulation) intact & going into the metal back box no grommits are needed .

As some singles dont have a second insulation layer for protection when entering a metal back box then the installation method is completely different so i think MDJ already knows the answerd to his own question as do i . To ask me 4 an illegal example deserves no response. AGAIN ,, ELECSA advised me of this even thou i fitted the grommits ,

 

[kingeri]

As long as the wire has its (double insulation) intact & going into the metal back box no grommits are needed .

As some singles dont have a second insulation layer for protection when entering a metal back box then the installation method is completely different so i think MDJ already knows the answerd to his own question as do i . To ask me 4 an illegal example deserves no response. AGAIN ,, ELECSA advised me of this even thou i fitted the grommits ,

Change the record will ya pal!?

Any PVC sheathed cable entering a backbox where conduit isn't used needs a grommet fitting on the box to keep the cable from being damaged by the sharp edges. You wouldn't have a wire​ entering a backbox unless in conduit anyway, would you, so what you're saying is actually tripe. Singles of any type (single or double insulated) would be run in conduit, unless I've been doing it wrong all these years......... Or am I missing something??

The grommet protects the outer sheath of the cable, even if that cable has a hundred layers of insulation!

 

[Rockingit]

Dependant with whom you are reg'd with im sure your answer will be differant ,


If you don't use em the part p police will take you away , NOT ! lol.

Good (or bad) practice has sod all to do with which scam you're registered with!

Put simply, a conscientious well-trained sparky looks after his cables.

 

[Rockingit]

Just to make the discussion a little more fruity..... what do we make of this?

 

[Marvo]

My 9 yr old monitor isn't cutting the mustard, is that some kinda copex?

 

[Rockingit]

My 9 yr old monitor isn't cutting the mustard, is that some kinda copex?

20mm metal/pvc copex glanded straight on.

 

[Marvo]

Wow, in a domestic premises plus it's cemented in.... that's a bit extreme. We use copex in commercial and industrial, especially in mining applications, it's good but it's expensive.

 

[valleybilly]

Change the record will ya pal!?

Any PVC sheathed cable entering a backbox where conduit isn't used needs a grommet fitting on the box to keep the cable from being damaged by the sharp edges. You wouldn't have a wire​ entering a backbox unless in conduit anyway, would you, so what you're saying is actually tripe. Singles of any type (single or double insulated) would be run in conduit, unless I've been doing it wrong all these years......... Or am I missing something??

The grommet protects the outer sheath of the cable, even if that cable has a hundred layers of insulation!

Shoot the messenger trolling more like . This is ELECSA advice NOT MINE for fs sake , I fit the dam things as ive said .' no wonder so many just read mostly or bin this site & move on .

 

[Guest55]

4 pages of posts about grommits in backboxes :-/

i think i've lost the will to live , can someone direct me to the nearest emergency cyanide pill.

;-)

 

[ipf]

Plenty classes of kopex available, that looks good. Used to use conduit and flexible tubing on can curing ovens for export. The flexible was anaconda. Never seen anything better on the market in standard or for ease of use. Brilliant stuff.

 

[Marvo]

4 pages of posts about grommits in backboxes :-/

i think i've lost the will to live , can someone direct me to the nearest emergency cyanide pill.

;-)

You're just bitter because we've covered all the angles and then some without you plus we did it in less than 55 posts.

 

[Guest55]

good grief valleybilly , give it at rest with what your scheme told you , we dont care and the cats out the bag now lol.

and FFS at least spell your home town correctly , makes you look an even bigger numpty.
;-)

 

[markythesparky]

Change the record will ya pal!?

Any PVC sheathed cable entering a backbox where conduit isn't used needs a grommet fitting on the box to keep the cable from being damaged by the sharp edges. You wouldn't have a wire​ entering a backbox unless in conduit anyway, would you, so what you're saying is actually tripe. Singles of any type (single or double insulated) would be run in conduit, unless I've been doing it wrong all these years......... Or am I missing something??

The grommet protects the outer sheath of the cable, even if that cable has a hundred layers of insulation!

Shoot the messenger trolling more like . This is ELECSA advice NOT MINE for fs sake , I fit the dam things as ive said .' no wonder so many just read mostly or bin this site & move on .

He's off the ropes and has come out fightin'!

 

[Rockingit]

Wow, in a domestic premises plus it's cemented in.... that's a bit extreme. We use copex in commercial and industrial, especially in mining applications, it's good but it's expensive.

Here's why!





For a kitchen island!

 

[Guest55]

You're just bitter because we've covered all the angles and then some without you plus we did it in less than 55 posts.

dont know why youre getting all cocky marv , the topic should have been concluded with 1 post.........

"thread closed"
;-)