Diver I have to go with George's post.
I fully understand that as an engineer you have to be precise, that is your profession.
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Most electricians do not need to be that accurate for VD, and regardless of what the books tell us the real world has shown us that equipment is much more tolerant to voltage variations then you would think.
Voltage drop is not a safety issue, it is more of an efficiency issue.
Just out of curiosity have you ever checked your VD predictions against the real thing after the work is done?
George, who the heck uses Article 647?
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I have never seen that article applied, it does not apply to much.
647.1 Scope.
This article covers the installation and wiring of separately derived systems operating at 120 volts line-to-line and 60 volts to ground for sensitive electronic equipment.
Bob
