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#6476 - 07/14/09 08:21 AM Re: V/D and the NEC [Re: ]
Bryan Holland Offline

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Registered: 10/05/04
Posts: 1622
Loc: City of North Port
Originally Posted By: gfretwell
This discussion does prompt an interesting question. How many of you require V/D calculations when plans are submitted?


I do. In some cases, I will allow a general statement to be made about voltage drop on the plans if it does not appear any specific feeders or BC runs will be that long. It really has never been that much of an issue. Occasionally, you get a long homerun for feeders or a house circuit or perhpas parking lot lighting, but for the most part, VD is fairly limited by typical design.
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Bryan P. Holland, MCP

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#6477 - 07/14/09 09:31 AM Re: V/D and the NEC [Re: ]
psnorthrup Offline
Mechanic Member

Registered: 04/23/07
Posts: 115
Loc: Plant City
only when referenced in the plans or specs

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#6487 - 07/16/09 12:07 PM Re: V/D and the NEC [Re: psnorthrup]
gfretwell
Unregistered


It would be interesting to run V/D calcs on an HVAC condenser, sized to the nameplate minimum circuit ampacity.

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#6488 - 07/16/09 04:43 PM Re: V/D and the NEC [Re: ]
Ruben Rocha Offline
Senior Member
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Registered: 05/24/00
Posts: 767
Well I can tell you that in my home. The building is a long narrow home that turns 90 degrees for the three car garage. L shaped home.
The panel is in the garage
I have never considered VD for a residence. Especially for a 2100 sq foot home.
But I can tell you I have a serious VD issue in the longest circuit.
Especially when my wife uses the hair dryer.
One of these days I will replace the home run from #12 with #10.

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#6490 - 07/21/09 07:06 PM Re: V/D and the NEC [Re: ]
Ron Wampler Offline
Apprentice Member

Registered: 08/20/08
Posts: 43
Loc: Florida Keys
You get what you pay for...although it is heat loss (I*R) and definately should be in our energy code...You are all very knowledgable..

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#6493 - 07/22/09 10:38 AM Re: V/D and the NEC [Re: ]
Ron Wampler Offline
Apprentice Member

Registered: 08/20/08
Posts: 43
Loc: Florida Keys
V/D is I*R heat loss so I like seeing it in the energy code...I look at long runs with significant load for conductor sizing...my main concern with oversizing the circuit is to educate designers and contractors to additionally oversize the equipment grounding conductor as required in NEC 250-122; I see that as the real safety issue such as parking lot lighting runs...

Yes, all references and FBC form the requirements as in any discipline...

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