Voltage Drop Calculation for Conductors larger than 310.16

[ggunn]

I did not mean that way. The maximum allowable voltage drop for any given circuit is fixed, because the ampacity of the circuit is fixed. So to your question "what is the maximum voltage drop that #1 THHN can safely attain at a 75deg rating?", the answer begins with ''Where is the circuit?''

Again, no. The maximum voltage drop for a circuit is determined by whatever is the lowest voltage acceptable under load for whatever is hanging out there on the other end of the conductors. The ampacity is determined by the heat tolerance of the insulation of the conductors. These are two separate issues, involving separate calculations. Sizing conductors for voltage drop only involves ampacity in that it establishes a minimum conductor size. Determining a minimum conductor size does not involve voltage drop at all, and it is possible to have 100% voltage drop without damage to the conductors if the conductors are long enough.

We all know what to do, at least I think we do. First we establish a conductor size based on ampacity and demand, then we size them up for voltage drop, if needed. The equations for conductor sizing do not have a voltage drop term in them, and the equations for voltage drop do not have an ampacity term in them. It seems very straightforward to me.

This is a silly argument and it's beginning to smell like a troll.

 

[ggunn]

Let me try to cut to the chase. We all know that there is a maximum amount of current you can push through a conductor of a given ampacity, adjusted for conditions. For a conductor of a specific length and that ampacity, that amount of current will produce a voltage drop of a calculable magnitude.

So what?

 

[T.M.Haja Sahib]

There is a maximum voltage drop based on maximum ampacity, but if you are overloaded the voltage drop will continue to increase. Again ampacity for insulated conductors is limited by the insulation - the conductor itself can carry more current.

You are also correct. But I do not want to continue the discussion, because at least one member is annoyed by it. Thanks.

 

[ggunn]

You are also correct. But I do not want to continue the discussion, because at least one member is annoyed by it. Thanks.

Don't stop flogging this dead horse on my account.

 

[iwire]

it's beginning to smell like a troll.

You know what they say about ducks.

 

[T.M.Haja Sahib]

You know what they say about ducks.

Thanks for your 'kind' but irrelevant remark. I think your 40,000+ posts in this forum are mostly of such type.