Voltage drop

T

Therealcrt

Senior Member
Location
Kansas City
Occupation
Electrician
This Mike holt video has controversy. Between nec allowable voltage drop and ANSI voltage drop and this and that blah blah.. tell me when a customer wants a receptacle added for whatever it is going to be used for.. if I calculate the distance and amperage and all that and it comes out to be me needing to run a #4 copper conductor for the circuit to not drop less than 3% do I do that? Or do I size it according to this video Mike holt put out and use 10% for a smaller wire???
 
For your application VD compensation is optional and not required so let your conscience be your guide. If your customer wants no more than 3% then they have to pay for no more than 3%.
 
Therealcrt said:
None of this answered my question. Watch his video first
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The code does not require that circuit conductors be sized to reduce voltage drop. That has been said more than once, so how is your question not answered. You can size the circuit anyway that you want too, as long as the rating of the OCPD does not exceed the ampacity of the conductor.
 
infinity said:
He saying that you have to comply with the manufacturer's instructions which under ANSI is between -10% to +5 compared to nominal voltage. I know of no one who is enforcing that based on 110.3.
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Ok so basically if your v drop for any circuit exceeds 3% then you adjust wire size accordingly
 
Therealcrt said:
Ok so basically if your v drop for any circuit exceeds 3% then you adjust wire size accordingly
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Not really, if your starting voltage is 115 volts and down the street your starting voltage is 125 volts how does a generic percentage work?
 
roger said:
Not really, if your starting voltage is 115 volts and down the street your starting voltage is 125 volts how does a generic percentage work?
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roger said:
Not really, if your starting voltage is 115 volts and down the street your starting voltage is 125 volts how does a generic percentage work?
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Down the street? Huh I’m talking if I was at a buildings nominal voltage was 120/208 1 outlet they need is 300 feet away. I do calculations to size wire based on not dropping over 3% Right?
 
Therealcrt said:
Ok not the video I’m taking real world that’s the whole purpose of the question
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Disregarding Mike's video in the real world the VD percentages in the NEC are merely suggestions. If you feel that it's a better job to provide VD compensation then that's fine you may do so. If the building system is 208Y/120 then use those numbers in your calculation.
 
Therealcrt said:
Down the street? Huh I’m talking if I was at a buildings nominal voltage was 120/208 1 outlet they need is 300 feet away. I do calculations to size wire based on not dropping over 3% Right?
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What is the voltage rating of the equipment that will be connected to the circuit?
 
infinity said:
Disregarding Mike's video in the real world thew VD percentages in the NEC are merely suggestions. If you feel that it's a better job to provide VD compensation then that's fine you may do so. If the building system is 208Y/120 then use those numbers in your calculation.
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Suggestions? So in regards to VD, a 20a circuit single outlet installed 300 feet from the breaker can be ran in #12 because VD is a suggestion? You’d get Like 80v at the device so come on?
 
Therealcrt said:
Down the street? Huh I’m talking if I was at a buildings nominal voltage was 120/208 1 outlet they need is 300 feet away. I do calculations to size wire based on not dropping over 3% Right?
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You can but not required. So, let me try again, you are at a building and the service voltage is 120 volts, you are going to add a receptacle 300' away from the service, then a customer calls from down the street and wants a receptacle added 300' from their service but their service voltage is 115 volts, how does one size fit both?
 
roger said:
You can but not required. So, let me try again, you are at a building and the service voltage is 120 volts, you are going to add a receptacle 300' away from the service, then a customer calls from down the street and wants a receptacle added 300' from their service but their service voltage is 115 volts, how does one size fit both?
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you’re loosing my point with this. Why
 
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