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I see your point, but if the calculations weren't precise, did they actually do more harm than good perhaps? How imprecise were they? Perhaps if they bring them back and they are still not precise, there would be some sort of disclaimer along with the calculations?
What I don't get is all of that would be based on data and formulas and everything that BIM is about... how were they not precise? Was it due to cable/wire run lengths not being precise? Could a buffer be put in or something to make the imprecise at least err on the side of caution? Perhaps something global that could be set in the options somewhere (calculate 1'-0" = 1'-1" for example)? I'm sure there are other things that affect voltage drop calculations also, but length was the most obvious other than wire type and gauge in my non-electrical engineer mind. And wire type and gauge I would imagine are basically set in stone (sheathing, braided/solid, copper/alum, stuff like that).
They were very conservative. I think it calculated the entire load at the farthest device.
The calcs can't really be exact - nobody really knows exactly how the electrician will wire each device, or in what order. If they branch off 2 different directions from one device, it can have a huge impact on the calculations.
But it was a good starting point. If the calcs said voltage drop wasn't a problem, then I didn't have to look at it any closer. If it upsized one wire size, I usually just accepted that. If it gave me a crazy large wire size, then I would look closer.
Oh, OK. I get that now. So it always erred on the side of safety anyhow... perhaps a bit too much... but at least it was better than the other way. So with a disclaimer that it is not accurate, why not... yeah. Makes sense to me.
@sragan load being at the end of line was less of an issue than the length of the circuit not being understood. Also wire sizing and impedances were destroyed in the 2026 implementation. Recommend you adopt ElectroBIM from Design Master if you need real electrical analytical tools in the Revit environment.
