I love it when we can start the issue over again..
if you are using wire ties to securely fasten conduit. Then the amount the pipe weights comes into the equation..like T&B L-7-50-0-C cable ties are rated for 50lbs so how would you determine the load of the piping system??
so to securley fasten means:In a secure manner; in a manner free from danger, In a manner free from fear or risk
Check 342.30 Securing and Supporting. That is for IMC..344.30 is for RMC..348.30 is for FMC..350.30 is for LFMC..352.30 is for PVC..
you get the idea it is listed in each specific type of material..
I didn't have my camera yesterday but I came across a rack of conduits running on a block wall. 2" gas pipe and 4, 1 1/2" EMT conduits running about 400 feet, 3' high on an exterior block fence.
The unistrut every 10' was secured with two1/4" bulldogs (mushroom head drive pins). About 50' had sheared off pins and pulled free. They had hand trucks chained to the rack so no one would steal them.
This thing is a month from disaster and the guy in charged seemed to shrug it off. I told him "$200 now or $5000 later"
Secure means secure. They leave it up to the installer.