Originally Posted by savatreatabvr
That really bites but I do want to comply with all electrical codes! Is there a chance anybody knows WHY the 3 wire can't be spliced and the 4 wire can or do they not explain why in the code book?
Yeah, somebody knows why. Will they tell you? Not likely. Transparency for large, powerful organizations is hard to come by.
Physically this makes no sense to me. How do the splices know how many conductors the other splices are connecting?
Even if a splice failed you've got a metal box around it and
you would see symptoms of a failing splice. When the appliance is off there is no current flow and so a splice failure is irrelevant.
And just like GFCI tests, once/month you could check ground conductor integrity.
If wirenuts make you nervous you could maybe use crimp type connectors. And an outer, much larger metal box with a smoke detector inside.
I doubt that the NFPA will explain their reasoning - I asked them about a related issue and their answer did not give me a warm fuzzy feeling.
And the 2014 Code changes seem to show that selling new hardware is the main thing, regardless of how much additional safety you get or don't get for each additional dollar spent. Not to mention all the false alarms with AFCIs and some GFCIs.