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Fix Revits Conductor (wire) size issue

Revit’s wire sizing is all wrong and it we should be able to disable it and set it manually.

Currently Revit uses a simple voltage drop calculation to size wires and it’s pretty much useless. It takes all the load on a circuit and all the distance of all elements and does a quick simple voltage drop calculation. It figures out what the voltage drop would be if all the load were at the end of all the wire. This is way too conservative.

Take the case where you have a string of site light poles all in series. The voltage drop of this real life situation will be drastically lower than the simple calculation. Really the calculation you have to do is step through each segment of conductor and account for the current that drops off as you move from conductor to conductor. This is pretty complex and revit doesn’t seem to be configured to do that since right now a circuit can only have one conductor size. So let’s add an option to disable it and let us set wire sizes manually.

Thanks,
Glen
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Advisor
Advisor

Votes for MEP ideas should have a multiplier equal to the user's Rank Emoticono feliz

Anonymous

100% agree! I would like to add that it also does voltage drop wrong for feeders... when the NEC asks for under 5% VD source to load.... and Revit is over here taking each of your feeder runs individually without paying any attention to the cumulative effect of voltage drop on all conductors source -> load.

Anonymous

Agreed. Because of the lack of ability to override conductor sizes and quantities (not just for the whole run, but between devices in the circuit) -- Revit circuits have never been fully adopted for voltage drop calculations for the 3 firms I've worked for, and nearly 10 years of Revit circuiting.