Use 3/8-inch or 1/2-inch Rod for Trapeze Hanger?

When hanging a 6-inch Schedule 10 pipe via trapeze hangers, the trapeze material is a 2.5-inch Schedule 40 pipe spanning 6 feet 6 inches.

I’ve been instructed to use 3/8 rod and beam clamps for the trapeze hangers and then a heavy-duty 2.5-inch ring with a 1/2 button going down to the 6-inch pipe. The job is based on NFPA 2019.

The table for NFPA 13 17.2.1.1 states that rods must be 1/2 for 6-inch pipe.

I’ve been instructed that we are basing our decision on the following rule, which means we do not need to use a 1/2inch rod for the trapeze hangers themselves, only for going from the trapeze to the 6-inch pipe.

17.2.1.2 Rods of smaller diameters than indicated in Table 17.2.1.1 shall be permitted where the hanger assembly has been tested and listed by a testing laboratory and installed within the limits of pipe sizes expressed in individual listings.

Is this correct? Is 3/8-inch rod or 1/2-inch rod appropriate here?

Thanks in advance.

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