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Hello guys. This is my first post so go easy on me.

I have had a install job at the company I work for currently. It is pvc 20mm conduit run on the wall horizontally. Seeing that the 18th edition in reg (521.10.202) Note 3 says that plastic clips are not meant to be used as a sole means of support and suitably spaced metal fixings should be used. So for the sake of this argument and this installation, we are using all metal saddles. My confusion begins that according to my supervisor the saddles are meant to be spaced at 250mm apart and no more then 150mm from a bend. I referenced back to the onsite guide Appendix D, Table D3 which says that distance between supports (metal saddles) for 20mm Rigid Insulating (PVC) should be be no more then 1.5m Horizontally and 1.75m vertically. Note B mentions clips should be no further then 300mm from a bend.

I have heard from various sources that the spacing should be 250mm between the saddles. My question is, am I right to think that the spacings they are using is unnecessary or are they correct. If so, what regulation specifically says this and/ or what table shows this. I really want to do my work correct but I also want to be able to reference it back and understand it.

Thanks in advance guys
 
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