Voltag Drop
- Thread starter steveonb
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bphgravity
Senior Member
- Location
- Florida
Re: Voltag Drop
Your branch circuit or feeder conductors must be increased by 25% for continuous loads. Once you determine that conductor size, you would base your voltage drop off of that.
So for example, if I have a 45A continuous load, I initially would need #6 conductors. If the voltage drop exceeds my desired value, I would base it on the #6 conductors.
Your branch circuit or feeder conductors must be increased by 25% for continuous loads. Once you determine that conductor size, you would base your voltage drop off of that.
So for example, if I have a 45A continuous load, I initially would need #6 conductors. If the voltage drop exceeds my desired value, I would base it on the #6 conductors.
bphgravity
Senior Member
- Location
- Florida
Re: Voltag Drop
Your right, you don't multiply the "I" by 125% because the "cm" is the conductor size required by increasing the load by 125%.
Your right, you don't multiply the "I" by 125% because the "cm" is the conductor size required by increasing the load by 125%.
jtester
Senior Member
- Location
- Las Cruces N.M.
Re: Voltag Drop
quote by Bryan
Your right, you don't multiply the "I" by 125% because the "cm" is the conductor size required by increasing the load by 125%.
Your post makes me wonder if you are treating continuous loads differently than non-continuous.
Does a 50 amp continuous load on a #4 conductor present a different voltage drop than a 50 amp non-continuous load on the same #4? I believe the answer is no, they are the same. Forgive me if I misunderstand your thoughts.
Jim T
quote by Bryan
Your right, you don't multiply the "I" by 125% because the "cm" is the conductor size required by increasing the load by 125%.
Your post makes me wonder if you are treating continuous loads differently than non-continuous.
Does a 50 amp continuous load on a #4 conductor present a different voltage drop than a 50 amp non-continuous load on the same #4? I believe the answer is no, they are the same. Forgive me if I misunderstand your thoughts.
Jim T
bphgravity
Senior Member
- Location
- Florida
Re: Voltag Drop
No, what I am trying to state is that sizing the conductor for the continuous load is required, the volatge drop calculation is not. So, you first need to determine what size conductor is required for the circuit. Once you determine that, you can check to see if other circuit conditions present a voltage drop issue.
So again using the example of a 45-ampere continuous load, the "I" would be 45-ampere, but the "cm" would be based on 56.25-ampere rated conductor.
Am I making more sense?
No, what I am trying to state is that sizing the conductor for the continuous load is required, the volatge drop calculation is not. So, you first need to determine what size conductor is required for the circuit. Once you determine that, you can check to see if other circuit conditions present a voltage drop issue.
So again using the example of a 45-ampere continuous load, the "I" would be 45-ampere, but the "cm" would be based on 56.25-ampere rated conductor.
Am I making more sense?
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