question about voltage drop section 210.19 A 1

[haitham]

actually im confused about this section of voltage drop value limitations
[FONT=helvetica, arial, sans-serif]it is 3 % for branch circuits as recommended why it said "it isn't violating of the code although %Vd=5.3[/FONT]
thank you for your time

 

[don_resqcapt19]

Because, except for a couple of specific cases, voltage drop is not an enforceable rule....it is found in an "Informational Note".

90.4( C) Explanatory Material. Explanatory material, such as references to other standards, references to related sections of this Code, or information related to a Code rule, is included in this Code in the form of informational notes. Such notes are informational only and are not enforceable as requirements of this Code. ...

 

[victor.cherkashi]

If energy code is mandatory in your area, you can find required value there

Sent from my Nexus 5 using Tapatalk

 

[darekelec]

Or if you live in NYC there is a city amendment 210.19(A)(1) that makes it mandatory to keep VD to 3% and 5%

 

[Carultch]

Or if you live in NYC there is a city amendment 210.19(A)(1) that makes it mandatory to keep VD to 3% and 5%

Are there any examples of local rules that are more strict than the NEC voltage drop recommendations?

 

[darekelec]

nyc amendment

 

[iwire]

nyc amendment

How do you know the load on a general purpose branch circuit?

 

[haitham]

Thank you guys for these so helpful explanations ,but still wanna ask as u know V.D is important in design and affected important loads such as lighting ,motors ,why is it just informational note not a mandatory section -values -in Nec

 

[ActionDave]

Thank you guys for these so helpful explanations ,but still wanna ask as u know V.D is important in design and affected important loads such as lighting ,motors ,why is it just informational note not a mandatory section -values -in Nec

It is not as important as many make it out to be. Most any electrical equipment can operate just fine with as much a 10% below nominal voltage ratings.

When specific loads and specific voltage levels are required good design an professional installers would be in order. The NEC is a guideline for safe electrical installations, not a design manual.

 

[Dennis Alwon]

How do you know the load on a general purpose branch circuit?

I guess you have to assume the max-- 15 or 20 amps depending on the circuit. IDK

 

[haitham]

It is not as important as many make it out to be. Most any electrical equipment can operate just fine with as much a 10% below nominal voltage ratings. When specific loads and specific voltage levels are required good design an professional installers would be in order. The NEC is a guideline for safe electrical installations, not a design manual.

Thank you guys
yep ,the section 90.5(c) is the answer

 

[jumper]

How do you know the load on a general purpose branch circuit?

I guess you have to assume the max-- 15 or 20 amps depending on the circuit. IDK

I looked at the NYC amendments and I did not see where it is written for a way to determine the load for a general resi rec circuit.

Maybe I missed it.

Pages 29-31, http://www.nyc.gov/html/dob/downloads/bldgs_code/electrical_code_local_law_39of2011.pdf