applying 220.5 (B) to string circuit size

[ElectricPersonality]

I found a discussion on these forums in regards to solar inverter AC feeder circuits being allowed to round down when calculating the OCPD by applying 220.5 (B). Could the same logic apply when calculating the fuse rating for a string circuit (i.e. using the 1.56% rule)? I noticed paragraph 220.3 and the adjacent table was revised to remove all references to chapter 6, perhaps to make it more clear that nothing in article 220 would apply to any article in chapter 6? Is anyone still applying 220.5(B) logic to 690?

 

[pv_n00b]

I round and have never had anyone question it. The whole theory is a bit shaky the way the NEC applies it though. I mean, if I round 15.49A down to 15A that's a 3.3% difference, but if I round 701A down to 700A that's a 0.14% difference. I can round 15.49A down and use a 15A OCPD but if I have 701A I have to use an 800A OCPD and size the conductor for 800A. Makes no sense to do it this way but it is easy to apply.