Swa 25Mm/20Mm Gland Reducer

[padawan]

Hey guys, as the title suggests i am trying to find a SWA brasss gland reducer, to connect a 20mm CW gland to a 25mm threaded plastic enclosure knockout.

I am running a 3 core 6mm SWA, between 2 whiska 40a adaptable boxes. These ones to precise:

https://www.tlc-direct.co.uk/Products/WK607B.html

I plan to earth the armour using the whisk earth plates, like these:

http://cpc.farnell.com/wiska/ec607/combi-ec607-earthing-plate/dp/PL13437?CMP=CPC-PLA

The problem i have got is that 3 core 6mm SWA use 20mm glands, and the threaded entries into the whiska box are all 25mm. The whiska boxes are supplied with 25mm/20mm reducers but they are plastic, which obviously would mean that i loose continuity between the gland and the enclosure's earth plate.

It seems the best fix for this would be to use 25mm/20mm brass reducers, but i can't for the life of me find them anywhere. 

Can anyone point me in the right direction please, where i could find some brass reducers.

Or am i missing something here and going about it all wrong?

Thanks

 

[roys]

Part no BCA 1312 from neweys. Couple of quid each, got a Newlec outlet beside me which is part of the neweys group if you want me to go in and get you some but you should be able to get them over internet.

 

[M107]

https://www.tlc-direct.co.uk/Products/CORED25slash20.html?ad_position=1o6&source=adwords&ad_id=45425533757&placement=&kw=&network=g&matchtype=&ad_type=pla&product_id=CORED25%2f20&product_partition_id=74610877627&test=finalurl_v2&gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXjRmvUDJXd1nmujq0vn_kly0DjUwvInTOYtnoo2AavkaAibb8P8HAQ

http://www.websparky.co.uk/acatalog/ReducerS-25mm-20mm-Galvanised-BA4712520G.html?gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXiq6iGcx02qGhEWYphX4kS-jW6bPh2YYnRg5TrdKAhAaAojd8P8HAQ

http://www.meteorelectrical.com/clearance_galvanised-accessories_other-galvanised-accessories_galvanised-reducers-25-20mm.html?tax_val=1&currency=GBP&country_id=222&gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXtuLI9Y9UzG0Z_Yvp5ffE2zduSAN4ViFNu4NETTZV9saAnAc8P8HAQ

 

[OnOff]

Got them here before:

http://www.cablecraft.co.uk/brass-metric-to-metric-reducers.html

 

[padawan]

Part no BCA 1312 from neweys. Couple of quid each, got a Newlec outlet beside me which is part of the neweys group if you want me to go in and get you some but you should be able to get them over internet.

Cheers mate that is very kind of you to offer but i have a newwys round the corner from me too, plus as u say now i know what to put into google i should be able to get hold of some easy enough.

https://www.tlc-direct.co.uk/Products/CORED25slash20.html?ad_position=1o6&source=adwords&ad_id=45425533757&placement=&kw=&network=g&matchtype=&ad_type=pla&product_id=CORED25%2f20&product_partition_id=74610877627&test=finalurl_v2&gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXjRmvUDJXd1nmujq0vn_kly0DjUwvInTOYtnoo2AavkaAibb8P8HAQ

http://www.websparky.co.uk/acatalog/ReducerS-25mm-20mm-Galvanised-BA4712520G.html?gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXiq6iGcx02qGhEWYphX4kS-jW6bPh2YYnRg5TrdKAhAaAojd8P8HAQ

http://www.meteorelectrical.com/clearance_galvanised-accessories_other-galvanised-accessories_galvanised-reducers-25-20mm.html?tax_val=1&currency=GBP&country_id=222&gclid=Cj0KEQiAqK-zBRC2zaXc8MOiwfIBEiQAXPHrXtuLI9Y9UzG0Z_Yvp5ffE2zduSAN4ViFNu4NETTZV9saAnAc8P8HAQ

Got them here before:

http://www.cablecraft.co.uk/brass-metric-to-metric-reducers.html

Thanks for the links guys I know this is going to sound like a really stupid question, and please excuse my ignorance but are conduit fittings comparable with enclosures not meant for conduit?

Also is there a risk of corrosion using gal fittings and brass glands?

Thanks

 

[roys]

If it is 20mm electrical thread it will be 20mm 1.5mm pitch, so it will take a 20mm gland, conduit adaptor, conduit etc. all interchangeable.

As for corrosion a lot will depend on the environment, I am trying to think if I have had any particular reaction between galvy and brass fittings over the years, certainly had corroded fittings over the years but nothing I can say I would put down to a reaction between the brass and galvy. I am sure some of our more cleverer people will be along shortly to advise more

 

[Evans Electric]

Just do it , Paddywack , or get a brass reducer if it worries you .    Or change the box for one with 20mm holes.

 

[Lurch]

One of my jobs is making looms for a worldwide client who supplies/installs equipment in all sorts of applications (heavy industry, indoors, outdoors, anywhere really). Thousands of brass glands have been used with galv reducers since long before my time (and hundreds during).

 

[Sidewinder]

Brass is an alloy of copper & zinc.

Galvanising is a zinc coating.

So, the contacting materials are more alike than it would first seem.

More alike than nickel & brass anyway.

So a galv reducer will be fine, it's all I use too, normally.

 

[Tony S]

I’m not going back taking out the 1000’s of galvanised reducers we used over the years.

As SW said they are sort of similar metals.