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tech / alt.engineering.electrical / Re: center load voltage drop calculation

SubjectAuthor
* Re: center load voltage drop calculationJW
`* Re: center load voltage drop calculationJW
 `* Re: center load voltage drop calculationTony Stewart (EE since 1975)
  `* Re: center load voltage drop calculationJW
   `- Re: center load voltage drop calculationTony Stewart (EE since 1975)

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Re: center load voltage drop calculation

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From: 37bf9221...@example.com (JW)
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Subject: Re: center load voltage drop calculation
X-Poster: Hermes 2.0
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 by: JW - Tue, 1 Nov 2022 21:31 UTC

Dean, i feel a little dense and need definition. i understand the math and see how to arrive at 91.78 feet. what exactly does the 91.78 feet tell me? all the loads have a distance in feet from the load center so what exactly is the 91' to the load center tell me? help a brother out

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For full context, visit https://www.polytechforum.com/electrical/center-load-voltage-drop-calculation-8964-.htm

Re: center load voltage drop calculation

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Subject: Re: center load voltage drop calculation
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 by: JW - Wed, 2 Nov 2022 22:45 UTC

never mind, i figured it out. if anyone else is wondering, the 91.78' is the length/distance used in any of the voltage drop formulas

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For full context, visit https://www.polytechforum.com/electrical/center-load-voltage-drop-calculation-8964-.htm

Re: center load voltage drop calculation

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From: 8629bc13...@example.com (Tony Stewart (EE since 1975))
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Subject: Re: center load voltage drop calculation
X-Poster: Hermes 2.0
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 by: Tony Stewart (EE sin - Thu, 3 Nov 2022 12:02 UTC

Does this 18 yr old question need some context? like what is the design voltage tolerance error for any load range to every location? My understanding is that this tolerance must be 5% max by design for load regulation error which is the change in the ratio of feed source impedance to load impedance for distribution error. and not just the mean current-distance product.

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For full context, visit https://www.polytechforum.com/electrical/center-load-voltage-drop-calculation-8964-.htm

Re: center load voltage drop calculation

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Subject: Re: center load voltage drop calculation
X-Poster: Hermes 2.0
References: <lloydj-24D4D2.11391631012004@news.supernews.com> <BC42A96F.4C070%dh0496@ineINbrasVALkaID.com> <1723935af80bfd4d$1$494992$3d389da@news.newsgroupdirect.com> <1723e5ef611e6825$1$3863881$c7d34dd6@news.newsgroupdirect.com> <17241172bc8746eb$1$3552867$cbd341d6@news.newsgroupdirect.com>
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 by: JW - Thu, 3 Nov 2022 14:15 UTC

thank you Tony, there is little to be found about load center lengths. mean-current distance may have produced some results. the suggested 5% max in the NEC is interpreted in different ways from county AHJ to county AHJ but would be the suggested acceptable voltage drop from the feeder to the end of a branch circuit. from the final over-current device (branch circuit) to the end of the circuit, it is 3%. i question the load center length method as you do. for multiple loads on branch circuits, i was taught to find the drop between the source and load 1, the drop between load 1 & 2, the drop between load 2 & 3, then add them together for the total voltage drop. i had never heard of load center length until recently and this thread was all i found besides the nccer curriculum for level 3 electricity where i finally saw an example of the math.as you said, i question if the mean current-distance is accurate for a trouble free installation when multiple loads are included

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For full context, visit https://www.polytechforum.com/electrical/center-load-voltage-drop-calculation-8964-.htm

Re: center load voltage drop calculation

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From: 8629bc13...@example.com (Tony Stewart (EE since 1975))
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Subject: Re: center load voltage drop calculation
X-Poster: Hermes 2.0
References: <lloydj-24D4D2.11391631012004@news.supernews.com> <BC42A96F.4C070%dh0496@ineINbrasVALkaID.com> <1723935af80bfd4d$1$494992$3d389da@news.newsgroupdirect.com> <1723e5ef611e6825$1$3863881$c7d34dd6@news.newsgroupdirect.com> <17241172bc8746eb$1$3552867$cbd341d6@news.newsgroupdirect.com> <172418af6b4e520c$3$218821$4bd3c1de@news.newsgroupdirect.com>
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 by: Tony Stewart (EE sin - Fri, 4 Nov 2022 03:45 UTC

news to me too, and seems more like the mean but with diurnal usage effects, the loads are not random so worst cases tend to add.

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For full context, visit https://www.polytechforum.com/electrical/center-load-voltage-drop-calculation-8964-.htm

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