That'll teach you for trying to help!
What Bjarney has posted will be of assistance in figuring general consideration points for voltage drop issues.
It's not the "Be-All, End-All" 100% rule document, it's only a helpful approach item.
Would like to know how one would "Figure Voltage Drop Per The NEC". Isn't this only an FPN in the NEC (NFPA 70), or did I miss the Article(s) with the Mandatory Rules of Voltage Drop (Shall / Shall Not rules).
Keeping voltage drop low is a Design issue, and done in the best interest for the Client.
Use of the percentages shown in the NEC's suggested examples (FPNs in Articles 210-19(a) and 215-2 of 3% from "Sub Panel" to load, and 5% total from Service / Power source to load), are general use guidelines which work well for common installations.
For "aldav53"'s situation, the text presented by Bjarney can be used to design these branch circuits with compensation for voltage drop, without having to perform the actual Math of a volts lossed calculation.
The lighting loads will likely be the higher loads, and the most noticably effected from voltage drop.
Are the Cameras just CCTV types, or are they something which draws upwards of 50 Watts each?
The latter example type Cameras might have maximum voltage drop specifications per the Manufacturer (available Line voltage minimums / maximums specs).
Not trying to be an a$$, just get ticked off when members try to help out, then later get toasted.
With that being said, does my Dicketry here in this message, qualify as poor excuse / approach?
Oh no, a Logical Paradox!!! This message has performed an illegal function, and shall be terminated. If this problem continues, contact the vendor.