Imperial Conduit

[NozSpark]

Just a quickie.....

Is there such a thing as a 3/4 to 20mm conduit coupler???

Its just that a job I'm on has had some imperial metal switches replaced with a PVC box and PVC female adaptor (just pushed over) using the conduit as CPC

 

[kerching]

Yes they are available bothe ways....depending whether you want the male to be 20 mm.    Or 3/4"

 

[steptoe]

Ive used liquid metal in the past.

 

[NozSpark]

You mean female/male???

A coupler would be better though, then it could just be bushed into a pattress/MC box

 

[kerching]

Ah just re read it

never seen a coupler , only an adapter with male at one end and female at the other

sorry

 

[steptoe]

I have heard it al now :slap

it works,

if its good enough for a bike at the TT its good enough for a poxy conduit, 

saying that,

Ive just re-read and seen the PVC bit,   :Blushing

so now Im confused,

if the switch has been changed to PVC, and a PVC back box, what is the issue with keeping continuity into the back box?

 

[Sidewinder]

I've only ever seem m/f adaptors also.

I carry a few of each on the van, used one on a motor a coulple of days ago.

Could you manage with a female 3/4" to 20mm male & 2 lock rings?

 

[OnOff]

The old imperial 3/4" stuff............I assume it's what they term "to BS31"? What is the actual thread size of this this out of interest? Like M20 is "M20 x 1.5" .

 

[OnOff]

This lot will do M20 to 3/4" NPT female / female in brass for £11.17ea. For nickel plate add 15%. In stainless double it. About 2 weeks from order. Min order £30 ish. Plus carriage. I spoke to Jane there.

 http://raxton.co.uk/products/exd-adaptors/

 

[Sidewinder]

The thread on BS31 conduit is not NPT, it is a BSW thread form, and is yes 3/4" OD, and has 16tpi.

A 3/4" NPT (to ANSI/ASME B1.20.1) thread is just over 1" diameter, & has 14TPI, it's an inch & 50 thou actually OD.

A tapping drill for 3/4" NPT is 59/64" approx 23.416mm, so waaaayy over the 19.05mm OD of a 3/4" BS31 conduit.

Noz, if you are desperate I can get some made for you, but I'd look at a 3/4" F x 20mm M & 2 lock rings!!!

I have some I can post up if you struggle to get them, they are galv. & also have the other way.

Just looked at the link above, I have these in stock also if you need them, but not sure if I have them in 20 / 3/4"

 

[Sidewinder]

You could try looking for a Clipsal 1242AC20, which is what you actually want!

Trouble is Clipsal is now Schneider, and, AFAIK, this is a Clipsal Australia product, found an Au website listing it, and it is on the Clipsal.com site, not sure if you would get it from Schneider UK!

 

[apprentice87]

In the past i have just stuck a 20mm x 1.5 tap through the 3/4 hole and away you go!!!! just screw in the 20mm fittings!!!! Not perfect, but it worked!!!!

john..

 

[NozSpark]

Don't worry about it too much it's not part of the job that I'm doing, I just saw it and it looked l like a bit of a lash up

 

[Sidewinder]

Ahh OK, I thought you needed them Noz for a job you were on!

 

[kerching]

I have somewhere some 3/4" conduit taps and dies and the same in metric.....in an emergency i have made my own....but it is a pain