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Measuring conduit centres for lighting replacement

Ben22

I am looking for hints and tips for the precise measurement of conduit centres, currwntly have a task to replace hundreds on a fixed conduit system without any wriggle room so measurements have to be bang on, currently using trusty tape measure but is proving to be awkward at times due to span.

Any tips appreciated 

  • I'm imagining this is the galvanized sort of thing that needs to be threaded and then screwed up in the right order, rather than push fit, (where there are some mm of slip in the push fit joints which make it easier, and things can be 'sprung' in).

    In which case as presumably the boxes are already there, then the longer threaded barrel jointers can be used with lock-nuts to make a slightly adjustable length that means you can be short by perhaps 10mm and still fit the part, or indeed combinations of barrels and nipples to make adjustable sections where there is a need for a telescopic section. For thin walled boxes, using a male bush inside the box faccing out, and a male thread on the tube end, with a barrel to connect. These tricks allows a no-spring no-rotation retrofit.

    You could cheat and use short lengths of flexible, but that is not really acceptable in many places.

    If you have several the same or similar lengths to measure then a light weight roof batten with a couple of screws as a 'fork' to push onto the far end as a gauge plane saves the 'where on this fitting did I measure from ?' question.

    As for bending some folk are really good at it. I tend to make overlong, get the angles right, and then cut to length - but I do not do enough to claim expertise.

    A similar topic on the old forum click here

    Mike.

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