Working with old imperial conduit...

DNS1 · Jul 29, 2013

A mate just moved into a flat and has asked me to sort out a few things with the electrics, mainly convert some single sockets to doubles.

Unfortunately for me, everything has been run in singles in metal conduit without a CPC.

Need to get hold of some backing boxes with the appropriate sized knockouts to take the imperial conduit fittings correctly, but having a hard time finding them at my usual suppliers.

Anyone got any suggestions?

Cheers!

Engineer54 · Jul 31, 2013

Take a male bush to B&Q's or other hardware establishment to get the correct sized flat washers. 17mm bolt flat washers can be found just about anywhere...

ipf · Jul 31, 2013

Engineer54 said:
If you mean by a knats Pee, your right!! So no problems for the knockouts on back boxes then!!

So what's the use of using a cone cutter to widen it, as stated.

Engineer54 · Jul 31, 2013

ipf said:
So what's the use of using a cone cutter to widen it, as stated.

Think you're reading someone elses posts, not mine. I haven't mentioned cone cutters!!
Think we were talking about 3/4'' conduit at that time as well. It's now all but confirmed we're now talking about the old 5/8'' conduit....

ipf · Jul 31, 2013

Just noticed reading through, he was on about opening up a 20mm to 3/4, hence the comment which brought your response.
Think I was the 1st to mention 5/8.
No prob, time for bed.

Knobhead · Jul 31, 2013

Engineer54 said:
Take a male bush to B&Q's or other hardware establishment to get the correct sized flat washers. 17mm bolt flat washers can be found just about anywhere...

17mm bolt?

17mm spanner yes, 17mm bolt no.

davethsparky · Jul 31, 2013

M16 and M20 are the nearest common thread sizes. M18 exists but not common in everyday use.

You need an old fashioned bolt and fastenings shop or engineering supplies place really, they're the kind of people who will likely have something imperial to actually fit.

DNS1 · Jul 31, 2013

M16 should do the job...

DCF, I've heard of the Lewden adaptors, but only found one place selling them and they were HUGELY expensive!

Cheers for the help chaps, reckon I've got this one sorted!