wwhitney
Active Member
You need to measure the outer diameter of the conduit to check, as I indicated. If you don't have a pair of calipers, you could get one. Or if you have a parallel jaw clamp of sufficiently deep throat, you can use it as a pair of calipers and then just measure the gap.I don't have any way to confirm that.
Or you can roughly measure the OD to determine the trade size (e.g. in the range of the two numbers I gave you, or 1/2" bigger or 1/2" smaller). Say it's 2" trade size and you want to distinguish between 2.197" and 2.375". Cut a block of wood accurately to 2.375" long, with the other two dimensions smaller. Hold the 2.375" long side against the conduit, and hold two straight edges tight to conduit and to the ends of the block of wood, trying to get the straight edges parallel (you can tell by eye). Either you can, and the OD is also 2.375", or you'll find that the straight edges always diverge, and the OD is less than 2.375" .
Cheers, Wayne