Step Drill Bits

[sam400]

Fire retardant is not in the spirit of the reg, non combustible is, there terms are quite different.

The 960 deg flame retardant grommets that I suggested are more in the spirit of the reg than the standard grommets and bushes that you have just suggested. wouldnt you say?

 

[shanky887614]

most step cutters will be fine, ive had mine for a year and it still works fine (ive used it on panels, unistrut and trunking etc)

if you do use a holesaw use a decent one as some don't last long

 

[shanky887614]

The 960 deg flame retardant grommets that I suggested are more in the spirit of the reg than the standard grommets and bushes that you have just suggested. wouldnt you say?

it doesnt need to be flame retardent the reg is about the enclosure.

i think a brass bush and lockring is better than a plastic stuffing gland.

 

[sam400]

it doesnt need to be flame retardent the reg is about the enclosure.

i think a brass bush and lockring is better than a plastic stuffing gland.

No it doesn't need to be flame retardant but it's not always about doing the bare minimum,

What IP rating is a 20mm bush with twin and earth going thru it?

 

[shanky887614]

No it doesn't need to be flame retardant but it's not always about doing the bare minimum,

What IP rating is a 20mm bush with twin and earth going thru it?

depends how many twins are going through it

 

[sam400]

depends how many twins are going through it

OP says ring final is being connected so let's say 2

 

[shanky887614]

OP says ring final is being connected so let's say 2

i would use a trunking header rather than stuffer or whatever for each cable/circuit so its irrelevant what the ip rating of the trunking is.

i wouldn't install cables clipped direct except as a last resort, id rather have a length of mini trunking upto the board than clipped direct

 

[sam400]

i would use a trunking header rather than stuffer or whatever for each cable/circuit so its irrelevant what the ip rating of the trunking is.

i wouldn't install cables clipped direct except as a last resort, id rather have a length of mini trunking upto the board than clipped direct

I also use a trunking header on CUs where possible. I did a CU this week where all the cables were rear entry apart from one that was clipped down the wall above the board. I used a wiska emt grommet to bring this circuit thru the top surface off the board.
A neat and compliant solution that cost me about 30p

 

[Skimpy Wan]

Just had a look at the GripLoc® Consumer Unit Flat Form Kits and I can't see how they differ from a 20 / 25mm CTS gland?

I used these for drilling conduit, patresses, consumer units etc and they seems to last well (still on 1st set, but I use cutting compound when used on metal).

Am-Tech Large High Speed Steel Step Drill Set (3 Pieces) from Amazon.

From memory 2 x 2.5mm 6242Y cables will fit in a 14-16mm whole in plastic CU, patresses etc and 16mm with grommet strip in a metal CU.

 

[telectrix]

what kind of gland would you use for these twins?

 

[Barry White]

It would have to be double lipped:lips:

 

[Skimpy Wan]

I don't know, but I'd have to use my hands (& face) to look for sharp edges! :53:

 

[Skimpy Wan]

So what's the difference between those glands an a cts gland apart from they have two smaller holes rather than 1 (which tightens when tightened anyway)?

 

[davesparks]

So what's the difference between those glands an a cts gland apart from they have two smaller holes rather than 1 (which tightens when tightened anyway)?

The difference is they have holes shaped to suit T&E so that they actually seal around the Cable properly.