There is an article in the IAEI magazine this month advocating that the 3% and 5% in the FPN be made code.
It is no surprise the author is from the copper lobby but he does make a compelling argument that it might be part of an energy code. He even has a poll saying 94% of respondents think it should be in the NEC but that poll may have been taken around the doughnut box at copper.org.
If you actually put pencil to paper you will find that 310.16 and perhaps even 240.4(D) may not be very useful.
We could be using yet larger wire.
We might actually end up changing the typical topology of most wiring systems with more sub-panels and more use of multiwire circuits ... when the 2 pole AFCIs hit the market.
Thoughts?
