How To Calculate Service Drop Wire Size
Electrical Service Entry Cable Sizes for Long Wire Runs
How much to increase SEC wire size over longer distances
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Electrical service entry wire sizes are calculated for long wire runs in which the wire size must be increased to avoid an united nations-wanted voltage drop. We include links to wire size and voltage drop calculators.
This article series gives photos and tables of electric service entry cable sizes, electrical branch circuit wire sizes, bong wire, telephone wire, thermostat wire, and ampacity or fuse/excursion breaker ratings.
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Tables of SEC Sizes for Long Wire Runs for Copper & Aluminum Cable
This page gives the necessary increment in electric service entry wire size for long runs, for example between the electric meter and the chief electrical panel.
If you need wire sizes for shorter service entry cables up to 200A or for both curt and long branch excursion wires from xv to 50A
see SE Cable & BRANCH CIRCUIT WIRE SIZES vs AMPS
Summary Tabular array of Service Entry Cable Sizes
(Detailed tables follow the table given just below)
Electric Service Entry Wire Sizes Needed for Longer Run Lengths | ||||||||
Maximum Run Length in Ft. vs AWG Wire Size, @ <= 3% Voltage Drop, 120V per SEC Usher | ||||||||
| 25 ft. | 50 ft. | 100 ft. | 150 ft. | 200 ft. | 300 ft. | 400 ft. | ||
| Wire Material | AMPS | Wire Size AWG | ||||||
| Copper | 100A | 4 | four | 1 | two/0 | 3/0 | 300 kcmil | 500 kcmil |
| Aluminum | 100A | 2 | 2 | ii/0 | iv/0 | 300 kcmil | 600 kcmil | 1000 kcmil |
| Copper | 200A | ane/0 | ane/0 | 3/0 | 300 kcmil | 500 kcmil | 1000 kcmil | 500 kcmilthree |
| Aluminum | 200A | 2/0 | 2/0 | 300 kcmil | 600 kcmil | thou kcmil | 600 kcmil 3 | m kcmiliii |
Notes to the table above
- Using two 120VAC conductors, <= 3% maximum drop in voltage
- 240V Service provided as two separate 120VAC cables; All of these services are single phase. 3 phase power typically reduces the wire size to the next smaller.
- Requires 2 parallel cablevision sets
- Watch out: these are example wire or cable sizes vs. run or length for the specific parameters named hither and entered in the wire size and length calculator. Your installation may differ. For prophylactic and for code compliant electric wiring, exist sure to check with your local electrical code inspector and electrical code provisions.
- Adapted from two sources:
- VOLTAGE Drop Tabular array, [PDF], retrieved 2017/09/26, Cerrowire LLC, 1099 Thompson Road SE, Hartselle AL 35640, USA, Tel: 256-773-2522, original source: http://world wide web.cerrowire.com/files/file/voltagedrop.pdf
The 300 ft and 400 ft cable length data is from
- Cable size recommended based on voltage drop calculations. Calculated by Online voltage drib figurer: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Web page: https://www.southwire.com/calculator-vdrop
Detailed Copper SEC Sizes for Longer Cable Distances
The tabular array below shows Copper SEC wire sizes for various run lengths - be sure to encounter the boosted assumptions in the tabular array notes. The voltage drop is held to nether iii% across the long distance wire runs in these tables.
Copper SEC Wire Size for Long Runs for 200A Service | |||
| Cablevision Size1 | Distance 8 Ft. / K | Voltage Drop % | Stage |
| three/0 AWG | 200 - 225seven / 60 | 2.83 | i |
| 3/0 AWG | 200 / lx | two.45 | iii |
| iv/0 AWG | 250 - 2607 / 75 | 2.89 | i |
| four/0 AWG | 250 / 75 | 2.58 | 3 |
| 250 kcmil | 290vii / 88 | ||
| 250 kcmil | 290vii - 300 / 90 | 2.72 | 3 |
| 300 kcmil | 300 - 3207 / 90 | 2.78 | 1 |
| 300 kcmil | 350 / 100 | 2.82 | 3 |
| 350 kcmil | 3507/ 100 | 2.92 | ane |
| 350 kcmil | 400 / 120 | ii.89 | 3 |
| 400 kcmil | 450 / 135 | ii.97 | 3 |
| 500 kcmil | 400 - 4307 / 120 | 2.67 | 1 |
| 600 kcmil | 450 - 4757 / 135 | 2.74 | 1 |
| 500 kcmil | 500 / 150 | 2.89 | iii |
| 600 kcmil | 475 / 145 | 1 | |
| 750 kcmil | 500 - 535vii / 150 | 2.72 | 1 |
| 1000 kcmil | 6157 / 187 | i | |
Notes to the table above:
- Cable size recommended based on voltage drop calculations. Calculated by Online voltage drop calculator: 2019/07/23, Southwire, Tel: one-800-444-1700 Website: world wide web.southwire.com Email: CableTechSupport@southwire.com Web page: https://world wide web.southwire.com/calculator-vdrop
- Electrical Panel & Service Size: 200A 240VAC, Catastrophe amps if voltage driblet were 3% will be 194A
- Voltage: 240 VAC
- Maximum Voltage Drop: three%
- Parallels (Sets) 1
- Conductor installation is direct-buried, in conduit, OR overhead, unless otherwise noted
- See this Electric WIRE AMPACITY CHART [PDF] from CerroWire, retrieved 2021/eleven/25 original source: https://www.cerrowire.com/wp-content/uploads/2021/04/Cerrowire_Ampacity_Chart_210405.pdf
- Maximum wire run distance changes past required temperature rating:
The Amperage rating and distancees shown are for 90°C (194°F) THWN-ii, THHN, XHHW-2, Utilise-2 - copper wire;
Watch out: Note that dropping to 60°C (140°F) NM-B, UF-B copper wire, the maximum run lengths will exist substantially shorter.
- For smaller wire size ampacities & run lengths (#xiv copper or #12 aluminum) up through typical residential SEC wire sizes and amps
Encounter SE CABLE & Branch CIRCUIT WIRE SIZES vs AMPS
Sentinel out: the technology work and derivation of the tabular array above is derived from the sources listed beneath including manufacturer'due south tables and online voltage drop calculators but may not be correct for your specific installation. Check with your engineer or electrician.
Watch out: if yous are not trained and qualified to install electrical wiring a fault can result in fire, injury, or death. Be sure you lot review your piece of work plan with your local electrical inspector and that work is washed to the electrical lawmaking for the country and metropolis where you lot live. In the U.S. that'due south the U.Southward. NEC.
Detailed Aluminum SEC Cable Sizes for Long Wire Runs
The table beneath shows Aluminum SEC wire sizes for various run lengths - be sure to see the additional assumptions in the table notes.
Aluminum SEC Wire Size for Long Runs for 200A Service | |||
| Cable Size1 | Altitude Ft. / M | Voltage Drop % | Phase |
| 300 kcmil | 200 / 60 | 2.79 | 1 |
| 250 kcmil | 200 / 60 | 2.77 | iii |
| 400 kcmil | 250 / 75 | two.85 | 1 |
| 350 kcmil | 250 / 75 | 2.69 | 3 |
| 500 kcmil | 300 / ninety | 2.92 | 1 |
| 400 kcmil | 300 / 90 | ii.96 | iii |
| 750 kcmil | 350 / 100 | ii.67 | 1 |
| 500 kcmil | 350 / 100 | 2.95 | 3 |
| 1000 kcmil | 400 / 120 | ii.61 | ane |
| 750 kcmil | 400 / 120 | two.64 | three |
| 1000 kcmil | 450 / 135 | two.94 | 1 |
| 750 kcmil | 450 / 135 | 2.97 | 3 |
| Not Available | 500 / 150 | 1 | |
| chiliad kcmil | 500 / 150 | 2.83 | iii |
Notes to the table above: Assumptions
- Cable size recommended based on voltage drop calculations. Calculated past Online voltage drop calculator: 2019/07/23, Southwire, Tel: 1-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Spider web folio: https://www.southwire.com/calculator-vdrop
- Electrical Panel & Service Size: 200A 240VAC, Ending amps if voltage drop were 3% will exist 194A
- Voltage: 240 VAC
- Maximum Voltage Drop: 3%
- Parallels (Sets) i
- Conductor installation is straight-buried, in conduit, OR overhead, unless otherwise noted
Spotter out: if yous are non trained and qualified to install electrical wiring a error can event in fire, injury, or death. Exist sure you review your work plan with your local electrical inspector and that work is done to the electrical code for the country and city where you alive. In the U.South. that's the U.Southward. NEC.
How to Use a Voltage Drop Estimator to Determine Reqired Service Entry Wire Size
Here we give examples and compare the results of using ii example wire size and voltage drop calculators.
You volition see that Southwire and Paige calculators give similar results.
1. Southwire's Voltage Drop Calculator example calculating SEC wire size
Southwire's wire size computer at http://www.southwire.com/support/voltage-drop-calculator.htm is easy to use and clear.
The user specifies the number of phases (1 or 3), conductor (copper or aluminum), installation (direct buried, conduit, or overhead) and the input voltage, maximum allowed voltage drop (I use 3%), the length of the cable run, and the desired current (amps) at the end of the cablevision run. The calculator gives an appropriate wire choice and its parameters, such as this:
Case: Unmarried stage, aluminum conductor, directly buried, 120VAC, three% maximum voltage drop, 250 ft. cable run length, 100A electric current at end of cablevision
Event: i conductors per phase utilizing a #400 Aluminum conductor will limit the voltage driblet to ii.94% or less when supplying 100.0 amps for 250 anxiety on a 120 volt arrangement.
Changing the case above to 240 VAC, keeping other parameters the same gives this result:
Result: 1 conductors per phase utilizing a #iii/0 Aluminum usher will limit the voltage drop to two.82% or less when supplying 100.0 amps for 250 feet on a 240 volt system.
2. Paige Wire Size Calculator example calculating SEC wire size
Paige Wire's voltage wire size calcuator at http://www.paigewire.com/pumpWireCalc.aspx is also easy to employ and clear. Testing with the following parameters:
Example: 240 VAC Single Phase, 100A, 250 ft. run, 3% voltage drop allowed,
Result: 1 AWG Copper or 2/0 Aluminum
Changing the example above to 120VAC, keeping other parameters the aforementioned gives this result:
Effect: 3/0 AWG Copper or 250 MCM Aluminum
Siemens offers an XLS spreadsheet [ http://w3.united states of america.siemens.com/us/net-dms/internet/consultingengineerscomm/general/Docs/DA_VD_Calculator_V1.ane.xls - this accost leaves InspectApedia.com] that can be used to calculate voltage dropas do other sources, and there are numerous online voltage drop calculators - I like the Southwire reckoner given higher up. Exist sure to compare the computer's outcome with what the applicable electrical code volition permit.
Voltage Drop Index - VDI - when to increment wire size for long electric wire runs
The voltage drop index or VDI is a reference number that is based on the electric resistance of a wire and is calculated as
VDI = (Amps x Feet of run) / (% Voltage Drop immune 10 Voltage)
Typical allowable voltage drop is 2% or 4% depending on the awarding.
3% is the well-nigh commonly-accepted voltage driblet target.
More almost the VDI and VDI tables are given
at SE CABLE & WIRE SIZE TABLES vs AMPS
Question: what size Aluminum Service Entry Cablevision do I need for a 200A panel on a 400 pes length?
2019/07/23 Bob s. said:
I'm running a 400 foot principal cablevision from street to home, I want 200amp service and utilize aluminum wire. What size exercise I use to compensate for distance
Reply:
From the table of Aluminm SEC Cable Sizes for Long Runs you'll encounter the answers given below,
Respond: 200A, Aluminum wire, 400 foot run, direct buried SEC cable
For single phase power: 1000 kcmil aluminum wire will have a voltage drop nether 3% fora 400 human foot run of direct buried cablevision and a 200VAC unmarried phase electrical service. That gives us 194 Amps at the cease of the SEC run.
For 3 phase power: 750 kcmil aluminum wire will have a voltage drib under 3% for a 400 human foot run of directly buried cable and a 200VAC three phase electrical service. That gives us 194 Amps at the end of the SEC run.
Using a typical online voltage drop computer, keeping your voltage driblet belwo 3%, and using your 400 foot run and Aluminum wire for a 200 VAC service, we plugged the information into Southwire'due south voltage drop calculator to see what wire size would conform.
Details about Wire Size vs Voltage Drop for Long SEC Wire Runs
Voltage drop across a wire is proportional to the current flow and wire resistance; for AC power such as your service entry cable (SEC) total impedance and power cistron (the ratio of power loss) are considered likewise.
None of the standard voltage drop tables go beyond 200 feet of wire run. At 200 ft and 200A the tables get to 350 to 500MCM copper wire and for 200 ft and 200A the tables go to 600 MCM aluminum wire (Cerrowire.com)
For longer runs (similar your 400 ft) your engineer would either perform the voltage drib calculation and wire size. Or use one of the online voltage driblet calculators. Southwire provides an like shooting fish in a barrel-to-use voltage drop computer that I recommend. .
I expect y'all're going to finish up with at to the lowest degree 600 or 750 MCM AL wire - such a large size may not be applied fifty-fifty though the Cu will of course be more expensive. Allow's wait at the details.
- Case calculation 1 - Copper Wire, 1 phase ability
- Ability Factor: 100%
- Wire Size: 500 kcmil Copper
- Phase: Single phase
- Conductor: Aluminum
- Installation: Direct cached
- Voltage: 240VAC
- Cable run: 400 ft.
- Maximum voltage drib: 3%
- Current at end of cable: 194 Amps (200A - [.03 x 200])
- Calculated Voltage Driblet: with 500 kcmil copper wire: 2.67% - this is within the three% limit
i conductor per stage utilizing a 500 kcmil Copper usher installed Direct Buried will limit the voltage driblet to 2.67% or less when supplying 194 amps for 400.0 feet on a 240 volt 1 stage system.
- Example calcuation two - Aluminum Wire, 1 phase power
- Power Factor: 100%
- Wire Size: 1000 kcmil Aluminum
- Phase: Single phase
- Conductor: Aluminum
- Installation: Direct buried
- Voltage: 240VAC
- Cablevision run: 400 ft.
- Maximum voltage driblet: 3%
- Current at end of cablevision: 194 Amps (200A - [.03 10 200])
- Calculated Voltage Drop: 1000 kcmil aluminum wire: 2.61% - this is inside the 3% limit
1 conductor per phase utilizing a thou kcmil Aluminum conductor installed Directly Buried will limit the voltage drib to ii.61% or less when supplying 194 amps for 400.0 anxiety on a 240 volt 1 stage arrangement.
- Example calcuation 2 - Aluminum Wire, 3 Phase ability
- Power Factor: 100%
- Wire Size: 750 kcmil Aluminum
- Phase: Iii stage
- Conductor: Aluminum
- Installation: Straight buried
- Voltage: 240VAC
- Cable run: 400 ft.
- Maximum voltage drib: 3%
- Electric current at end of cable: 194 Amps (200A - [.03 x 200])
- Calculated Voltage Drop: 1000 kcmil aluminum wire: 2.64% - this is within the three% limit
1 conductor per phase utilizing a 750 kcmil Aluminum conductor installed Direct Buried will limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 anxiety on a 240 volt iii phase system.
- Example calcuation 2 - Copper Wire, 3 Phase power
- Power Factor: 100%
- Wire Size: 750 kcmil Aluminum
- Phase: Three phase
- Conductor: Aluminum
- Installation: Direct buried
- Voltage: 240VAC
- Cable run: 400 ft.
- Maximum voltage drop: 3%
- Electric current at end of cable: 194 Amps (200A - [.03 x 200])
- Calculated Voltage Drib: 350 kcmil copper wire: 2.89% - this is within the 3% limit
i usher per phase utilizing a 750 kcmil Aluminum conductor installed Direct Buried will limit the voltage drop to 2.64% or less when supplying 194 amps for 400.0 feet on a 240 volt 3 phase organisation.
Online voltage drop calculator used: 2019/07/23, Southwire, Tel: one-800-444-1700 Website: www.southwire.com Email: CableTechSupport@southwire.com Web page: https://world wide web.southwire.com/calculator-vdrop
Fundamental points in calculating voltage drop and selecting wiring cable
- 3% is the typical commanded voltage drop for SEC feeder wires
- 5% is the maximum recommended voltage drop for individual co-operative circuits.
- The 200A service is not necessarily the amps used in the voltage driblet adding though we've kept the 200A figure for these example calculations. The engineer doing a direct voltage drop adding adds up the anticipated current load or wattages for all of the circuits existence fed from the panel.
Full Watts / Circuit Voltage (110 or 220) = Total AMPS [Or more conservative: apply your nominal 200A console and breaker rating]
- Sentinel out: with a 400 human foot run your 200A wire size may be so big that information technology will non fit in the standard wiring lugs in your 200A panel. Your electrical supplier an provide a wire size reducer that can make the connexion between a larger diameter SEC wire and the lugs in your electrical panel.
- Watch out : when running larger service wires y'all may also need to run a larger service panel grounding conductor to earth.
Reader Comments & Q&A
Actually? yous ran or plan to run #ten copper wire 2,500 feet - nearly half a mile of electrical wire. In conduit?
There is but no way that yous can run a conventional 15A o 20A 120V or fifty-fifty 240V wire using #10/2 copper wire from your abode to a barn that's nearly one-half a mile abroad using any conventional wiring means. The wire will have such a large voltage drop that your delivery voltage will be likewise low and your pump either won't run or volition have constant trouble.
Here we talk over using a voltage drop calculator (we like i provided by Southwire) at which you input the basic parameters of
- cable run length
- voltage
- allowable voltage drop (normally limited to 3%)
- current(amp) required at cease of cable
- number of parallel wire set
I ran your case for two solutions:
Example 1: 2500 ft., 15Amps, 120VAC, and the wire size figurer returns
1 conductor per stage utilizing a 400 kcmil Copper conductor installed Direct Buried will limit the voltage drop to 2.95% or less when supplying 15 amps for 2500.0 feet on a 120 volt 1 phase organisation.
OR
Instance ii: 2500 ft., 15Amps, 240VAC, and the wire size figurer returns
one conductor per stage utilizing a three/0 AWG Copper conductor installed Direct Buried will limit the voltage drop to 2.74% or less when supplying fifteen amps for 2500.0 feet on a 240 volt 1 phase organization.
Frankly, if I were going to the problem and cost of running half a mile of electrical wire I'd run a 240V line to have a scrap more capacity at the other finish -
and I'd consider going to a 20A excursion, for which you'd need
ane usher per phase utilizing a 250 kcmil Copper usher installed Directly Cached will limit the voltage drop to 2.69% or less when supplying twenty amps for 2500.0 feet on a 240 volt 1 phase system.
Why? What are the chances that in one case electric service is brought to an isolated edifice nobody is going to want to run more than just a well pump? What about a light, or a receptacle to power an electric drill?
Shown above is a wire size table adapted from Encorewire.com cited theron
I'd do some shopping or consider an alternative power source (Solar ?)
Consider that at some suppliers we checked online (you may find meliorate price from a bulk electrical wire supplier)
the price for 2,500 ft of 3/0 copper electrical wire is over $11,000. U.S.
the cost for ii,500 ft. of 400 kcmil copper wire is around $30,000 U.Due south.
Thats for using UF-rated wire - intended for directly burial into soil.
If you instead want to try to run half-a mile of conduit - not something that's necessary in my Opinion, and if you used a iii/4" diameter flexible water-tight not-metal conduit like that provided by Southwire, shown below, y'all may salve by buying private conductors instead of sheathed UF SEC cablevision, at $136 / 100 ft., you'll add together about another $3,400. U.S. varying upwards or downwardly in cost depending on the conduit diameter needed.
This flexible conduit is rated as permittd for straight burial or for burying in concrete. The conduit wall is Schedule-40.
Likewise see conduit products from Hydromaxx.
I have x/2 UF-B Wire w/ Ground which runs hugger-mugger with no conduit for 2500 feet from the control box in the befouled to the two pressure tanks in my pump firm.
This is the third time it is shorting out and the well person who installed the arrangement saids he is not an electrician and unable to recommend what kind of wire I demand to replace information technology with.
Something about it is bleeding over causing the brusque.
Sending 120 volts up the wire and only receiving 58 volts back = which is burning the control components up.
What would be the correct kind and size of the wires to tell the pump to plough off.
There is hardly whatsoever load on the wires what would I replace it with?
Whatever feedback would be greatly appreciated. 503-663-2244 priano@gmail.com
@Jerry,
When you become to longer lengths than illustrated above on this page, you need to get to an online voltage drop calculator as noted above, such every bit:
http://www.southwire.com/back up/voltage-drop-calculator.htm
or
http://www.paigewire.com/pumpWireCalc.aspx
The section in a higher place:
How to Apply a Voltage Drib Figurer to Make up one's mind Required Service Entry Wire Size
will help you in using those online calculators.
Using a voltage driblet computer every bit nosotros suggested, yous'll see that if you allow a 3% voltage driblet your copper wire size for a 15A circuit at 120V and 650 ft needs to be a #2 AWG copper wire
3% is the recommended allowable voltage drop
v% is the maximum permitted drop on a typical co-operative circuit;
If you accept 5% voltage drop your copper wire could be #4 AWG.
For other readers:
For co-operative circuits at 15A up to 50A and for distances up to 400 ft
y'all volition observe our
Branch Circuit Wire Sizes Needed for Longer Run Lengths Table
at SE CABLE & WIRE SIZES vs AMPS
What size/blazon direct burial cable do I need to provide fifteen amps with at the end of a 650 ft run?
@Anonymous,
Please accept a look in the table "Copper SEC Wire Size for Long Runs for 200A Service" at the peak of this page.
what size wire for 200amp 140 pes run underground
@Larry, please check the sizing tables in the commodity above and allow me know if any of that is unclear or confusing
What size service entrance cable do I need for a 100 amp service and a 150 ft. run?
Tim
Check out
SE Cable SIZES FOR LONG WIRE RUNS
at https://inspectapedia.com/electric/Long-Run-SEC-Cablevision-Sizes.php
and don't hesitate to ask if that leaves you lot with questions
Thank you This Q&A were posted originally at Clandestine SERVICE LATERAL FAQs
I'm putting hole-and-corner electric service to my business firm. I accept 200 amp service. I need 200 feet of secret. What size wire do I need.
Bob,
Please check out the table for long runs of aluminum service entry cabling at SE Cablevision & WIRE SIZES FOR LONG RUNS
at https://inspectapedia.com/electrical/Long-Run-SEC-Cable-Sizes.php
where I repeat your question and give a detailed answer.
Let me know if that information is not articulate or if you lot're left with questions.
I'm running a 400 foot primary cablevision from street to habitation, I desire 200amp service and use aluminum wire. What size do I use to compensate for distance
...
Continue reading at SE CABLE & Branch Excursion WIRE SIZES vs AMPS - topic dwelling, or select a topic from the closely-related articles below, or meet the complete Commodity Alphabetize.
Or meet these
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- AMPS MEASUREMENT AUTOMOTIVE DC
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- AMPACITY, Master DISCONNECT
- DEFINITIONS AMPS VOLTS WATTS
- Electric METERS & METER BASES
- Electrical MOTOR HORSEPOWER & CIRCUIT WIRE SIZE
- Electrical PANEL AMPACITY
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- UNDERGROUND SERVICE LATERALS - cached Service Entry Cables
- GROUND SYSTEM INSPECTION - home
- SAFETY for Electric INSPECTORS - home
- SE CABLE & BRANCH CIRCUIT WIRE SIZES vs AMPS
- SE CABLE & WIRE SIZES FOR LONG RUNS
- SERVICE ENTRY WIRING & AMPACITY - wire sizes
- SIZE of WIRE REQUIRED for Electric RECEPTACLES for receptacle circuits and similar wiring situations
- VOLTS / AMPS MEASUREMENT EQUIP
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How To Calculate Service Drop Wire Size,
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