[BC] AC Voltage Drop

[PeterH]

On Jun 28, 2009, at 12:47 PM, Danny Ray Boyer wrote:

> Can anyone direct me to the paragraph(s) in the NEC handbook which
> reflects what kind of voltage drop is permissible from an electrical
> provider from no load to full load.  This is for a a 240 volt - 3  
> phase
> Open Delta AC circuit.

The NEC does NOT cover an electrical provider, which may do ANYTHING  
which the applicable State tariffs allow.

The NEC only covers a specific premises, and that limit is 5 percent,  
over a feeder from your service equipment to your load.

Of course, you may install ANY feeder which you prefer, and one which  
provides for 1 percent is certainly a possibility.

In a recent case, known first-hand to me, an abutter with a 200 amp  
service was provided with a #6 Al service drop, whereas I, with my  
inside knowledge of utility procedures, was able to get a #2 Al  
service drop, for my 125 amp service. My service conductors were #2  
THHN Cu.

I have NO light dimming when my machinery are activated.

My abutter is experiencing lots of dimming, even under normal  
conditions.