What Size Cable is Required to Feed a 1200a Panel Per Ul1640

Table of Underground Electrical Service Cable Sizes & Amps
Types & Marking Codes

• POST a QUESTION or COMMENT about buried or underground electrical service entry cabling or wiring

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Buried or underground electrical service entry cable ampacity & underground electrical service ampacity ratings:

How to determine the size, capacity, or ampacity of electrical service at a building.

This article explains how to estimate the electrical service size, (or "electrical power" or "service amps") at a building by visual examination of the buried service entry cables and other details that are available by simple visual inspection.

We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

UNDERGROUND Electrical SERVICE LATERALS - delivering current to a building

Electrical Services provided through underground conduit do not permit visual inspection of the service conductor prior to the electric meter and actual conductors are visible only in the service panel.

It is possible to guess at the cable run in a conduit by the diameter of the conduit itself [Table 2.] But for conductors from the utility company's drop to the meter, conduit size sets only the maximum conductor that could be contained, not necessarily the actual size.

Table 2. Electrical Service Conductor Cable Sizes & Amps Ratings for Service Conductors in Conduit
Service AMPS-USA	Rigid non-metallic conduit or iron pipe diam.
30	3/4" 1" in Canada
60	1"
100	1 1/4"
150	2"
200	2"

Notes to the table above

Pipe sizes are nominal; for copper wires.

Watch out: Do not attempt to open the meter base. If you are unable to determine the wire ampacity because there is no view, or because its dimension is not one with which you are familiar, say so.

Service Entry Wiring Guides, Procedures, & More Sizing Tables

• Goodheart-Wilcox, "THE SERVIE ENTRANCE" [PDF], Email: orders@g-w.com Mail: Goodheart-Willcox Publisher 18604 West Creek Drive Tinley Park, IL 60477-6243, 800.323.0440, 708.468.8692 E-mail: custserv@g-w.com Sample Chapter labeled FOR REVIEW PURPOSES ONLY retrieved 2017/10/05, original source: https://www.g-w.com/pdf/sampchap/9781605255828_ch10.pdf
• NIPSCO, SERVICE ENTRANCE - UNDERGROUND, Single & Three Phase 200 & 300/400 Amp [PDF] (2017), ER 19-270-P, Northern Indiana Public Service Company

Underground Electrical Service Burial Depth

How deep below the ground surface or below a concrete slab, walk, or a driveway must we bury electrical service entry cabling?

Watch out: Your local electrical inspector is the final legal authority on the required depth at which to bury an electrical service entry cable, but here are some common depths:

[Click to enlarge any image]

Typical Underground SEC or Electrical Wire Burial Depth
Type of Circuit	Minimum Burial Depth [6]
Direct Burial of SEC Cabling or Conductors	600 mm or 24 in
Rigid metal conduit or intermediate metal conduit	150 mm or 6 in
Nonmetallic raceways [1]	450 mm or 18 in
Residential branch circuits 120VAC or less [2]	300 mm or 12 in
30V or less special circuits	150mm or 6 in.

Notes to the table above

1. Raceway must be listed for direct burial without concrete encasement
2. Residential circuit must have GFCI protection and maximum overcurrent protection of 20A
3. Example: irrigation or landscape lighting circuits with UF or in a listed cable or raceway
4. Burial depth: means below the surface of the soil; some codes refer to this as the "required cover" or "required depth of soil cover" over the electrical conduit or cable or UF (Underground Feeder)
5. Source: Carmel CA's Building Safety Division, cited below.
6. Typical maximum is 48" - e.g. from Snohomish County PUD 24" to 48" is the recommended depth for electrical SEC cable conduit.

Other electrical wire burial depths from Snohomish - cited below

• Metal conduit carrying SEC - at least 6 inches below soil top
• Metal conduit carrying SEC - 4 inches under a 4-inch concrete slab.
• Metal conduit carrying SEC - no less than 18 inches
• Metal conduit carrying SEC - no less than 24 inches

In the UK and other countries the required depth of electrical cables will vary from the above.

Underground Electrical SEC or Circuit Burial Depth References

• Carmel CA, UNDERGROUND ELECTRICAL CABLE BURIAL DEPTHS [PDF] retrieved 2021/04/28 original source: https://ci.carmel.ca.us/
• Kansas ELECTRICAL CODE SECTION E3803 UNDERGROUND INSTALLATION REQUIREMENTS [PDF] retrieved 2021/04/27 original source: https://up.codes/s/underground-installation-requirements
• Snohomish PUD UNDERGROUND ELECTRICAL SERVICE REQUIREMENTS Section 4PDF] (1990) Snohomish County PUD, PO Box 1107, Everett, WA 98206-1107, USA Tel: 425-783-1000
• U.S. NEC, Table 300.5 Minimum Cover Requirements, U.S. National Electrical Code (2017) Excerpted below

U.S NEC 300.5 Underground Installations

(A) Minimum Cover Requirements. Direct-buried cable, conduit, or other raceways shall be installed to meet the minimum cover requirements of Table 300.5.

Notes to US NEC Table 300.5

a - A lesser depth shall be permitted where specified in the installation instructions of a listed low-voltage lighting system.

b - A depth of 150 mm (6 in.) shall be permitted for pool, spa, and fountain lighting, installed in a nonmetallic raceway, limited to not ore than 30 volts where part of a listed low-voltage lighting system.

Notes:

1. Cover is defined as the shortest distance in mm (in.) measured between a pont on the top surface of any direct-buried conductor,cable, conduit or other raceway and the top surface of finished grade, concrete, or similar cover.

2. Raceways approved for burial only where concrete encased shall require concrete envelope not less than 50mm (2 in.) thick

3. Lesser depths shall be permitted where cables and conductors rise for termination or splices or where access is otherwise required.

4. Where one of the wiring method types listed in Columns 1 through 3 is used for one of the circuit types in Columns 4 and 5, the shallowest depth of burial shall be permitted.

5. Where solid rock prevents compliance with the cover depths specified in this table, the wiring shall be installed in metal or nonmetallic raceway permitted for direct burial. The raceways shall be covered by a minimum of 50 mm (2 in.) of concrete extending down to rock.

Reader Q&A - also see the FAQs series linked-to below

Have a garage that's 900 feet away from power meter. What size underground wire do I need to run or 200 amp service?

@David,

As RHH refers to "Rubber High Heat" my guess would be that PHH on electrical wire insulation refers to Plastic High Heat electrical wire.

See our "Table of Wire Types vs. Temperature Ratings Reflected in the Wire Ampacity Chart Above"
found in

https://inspectapedia.com/electric/Electrical_SEC_Sizes_Amps.php

SE CABLE & BRANCH CIRCUIT WIRE SIZES vs AMPS has additional details on wire sizing. (Live link at the Recommended Articles list)

No surprise that the neutral or ground conductors in some electrical wire products may be a smaller wire gauge than the current carrying conductors.

My house was built in 1976. The neutral conductor is made by Philips and is labelled TWH 3. The two hot wires between the meter base and panel are labelled as PHH 1. I have not been able to find specs or ampacity numbers for this wire. Is this an earlier vintage of RHH 1 ?

@Randall,

UF is wire rated for use as an underground feeder. Wire sizes are given above on this page. Please take a look and let me know if any of that is unclear.

What size and type of underground cable do I need for a 100 amp sub panel box 50 ft away from main box?

@Ned,

On the page above please see the conduit sizing chart given in

Table 2. Electrical Service Conductor Cable Sizes & Amps Ratings for Service Conductors in Conduit

What size underground conduit do I need for 100 A sub panel

200 amp service 135 feet length what size teck cable would I need

@Bill,

At the WIRE SIZE & AMPACITY TABLES

You'll see #8 copper wire is rated for 40 Amps

As you'll see in the articles in this series you'll see some voltage drop at longer runs.

Also it's always safer to fuse at a lower amperage such as 30 amps on that wire.

I have underground 100 feet to garage. In panel is two 6g wire and two 8g wire (copper) If I use the 8 gauge for power and 6g for neutral what size breaker should I use

I need to run 775ft from meter pole to 100 amp box in a cabin. what size and kind of direct bury cable should I use? I know there will be a voltage drop its OK.

Don you're quite right, and there may already be such electrical design apps, though I suspect designers will be darn scared about pretending they can guide you safely through electrical wiring when there are many safety details that would be apparent to a licensed electrician but may not be apparent thus not mentioned nor considered by a normal person who's not already trained in the field.

Meanwhile this article series does take a stab at giving general wiring guidelines with simple tables: amps, distance, cable sizes, etc. Please take a look.

In this day and age, can't someone build an app where you start with a specific subpanel, plug into the app what breakers you intend to install (how many 240, how many 120, what amps for each breaker) and then what distance it is to the main panel and it tells you what wire size you need, how many amps on the main panel disconnect breaker, what underground conduit as applicable etc.?

Seems like the rules ought to be known well enough to get the computers in our life to figure out the hard stuff. Example, I'm building a shop 100 feet from the main panel and intend on having a 240v split AC requiring a 20 amp breaker.

The rest of the sub panel will be 120v normal loads of outlets and lights of about 6 breakers 15 amps each. Do I need to size my feeder wire for 100 amps of 120V or am I sizing for 100' of 240 V 50 amps? I mean each hot leg isn't going to see the full panel load? Be so simple to plug the components into an app and it tell me what the wire requirements would be.

what size & type cable do i need from load side of meter socket to 100 amp service panel going underground in conduit about 25 feet

Walter

Just above on this page please see the live link to the following article

SE CABLE SIZES FOR LONG WIRE RUNS - SEE THIS ARTICLE for wire size for long runs

what cable do I need for a 400 amp service 650 ft run and what transformer

I am looking for underground wire size needed to run 1200 feet .. I would like a 30 amp 240 volt service

what size underground wire do I use for 200 amp service for generator that is 200 ft away from the service meter?

Thanks, Mike, that's a helpful question.

Translating the markings & letters on your electrical wire: CSA USEB90 2CDR AWG4/0 1 CDR AWG1 is broken down and explained as follows:

CSA = Canadian Standards Association

USEB90 = USEB-90 Underground Service Entrance Cable consists of two compact aluminum conductors individually insulated with RW90 XLPE insulation, laid in parallel, with a helical plain copper wire serving and an overall PVC jacket covering. The copper wire serving is the neutral. The product meets the USEB-90 cable requirements of CSA.

So we know your wire is rated for underground use and from its size, it's intended to serve as an underground service entry cable.

For completeness I explain that OTHER electrical wires designated as designed for underground use will be marked "UF" for "Underground Feeder" - a non-metallic cable that can be used in wet locations or in un-protected locations such as by burying the wire directly in the ground (without a protective conduit). The usual color for UF cable is gray. Where used above ground the cable should be marked UF_B (sunlight resistant).

2CDR = 2 conductors

AWG4/0 = wire gauge or size is 4/0 (for aluminum wire that's suitable for 200A)

1 CDR = 1 conductor

AGW1 = wire gauge 1

So we have two 4/0 conductors (those will be the current carrying wires) and 1 AWG-1 conductor (that'll be the neutral conductor - or grounded conductor and so is a smaller size)

For a nice succinct summary of the properties of USEB-90 or USEB90 electrical cable take a look at General Cable's

PowrServ® XL Underground Secondary Cable Type USEB-90 600 V, Aluminum Conductor, XLPE Insulation, Overall PVC Jacket, CSA Listed [PDF] retrieved 2020/07/05 original source: www.stabiloy.com/NR/rdonlyres/F06452BB-E816-4B70-ABE0-6E4B5E8317EA/0/GCCDN_pg67_PwrServ_USEB_90.pdf or contact General Cable at https://www.generalcable.com/ Telephone: +1.859.572.8000

Available at InspectApedia.com

Question: What do the letters mean on wire: CSA USEB90 2CDR AWG4/0 1 CDR AWG1

2020/07/05 mike said:

What do the letter mean on wire CSA USEB90 2CDR AWG4/0 1 CDR AWG1

Moderator reply: Guidelines for USEB90 Feeder Cable

Thanks, Mike, that's a helpful question.

Translating the markings & letters on your electrical wire: CSA USEB90 2CDR AWG4/0 1 CDR AWG1 is broken down and explained as follows:

• CSA = Canadian Standards Association
• USEB90 = USEB-90 Underground Service Entrance Cable consists of two compact aluminum conductors individually insulated with RW90 XLPE insulation, laid in parallel, with a helical plain copper wire serving and an overall PVC jacket covering. The copper wire serving is the neutral. The product meets the USEB-90 cable requirements of CSA.

So we know your wire is rated for underground use and from its size, it's intended to serve as an underground service entry cable.

For completeness I explain that OTHER electrical wires designated as designed for underground use will be marked "UF" for "Underground Feeder" - a non-metallic cable that can be used in wet locations or in un-protected locations such as by burying the wire directly in the ground (without a protective conduit). The usual color for UF cable is gray. Where used above ground the cable should be marked UF_B (sunlight resistant).

• 2CDR = 2 conductors
• AWG4/0 = wire gauge or size is 4/0 (for aluminum wire that's suitable for 200A)
• 1 CDR = 1 conductor
• AWG1 = wire gauge 1

where

• AWG = American Wire Gauge (AWG) also referred to as the Brown & Sharpe wire gauge. This is a standard method of describing wire sizes or "gauges" that has been in use in North American since 1857.

  AWG is further defined and used in

  ASTM Standard B 258, Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors, available from ASTM or astm.org

So putting together all of those wire markings into a prose description, we have two 4/0 conductors (those will be the current carrying wires) and 1 AWG-1 conductor (that'll be the neutral conductor - or grounded conductor and so is a smaller size)

Guidelines for using USEB-90 Underground Feeder Electrical Cable

For a nice succinct summary of the properties of USEB-90 or USEB90 electrical cable take a look at General Cable's

• PowrServ® XL Underground Secondary Cable Type USEB-90 600 V, Aluminum Conductor, XLPE Insulation, Overall PVC Jacket, CSA Listed [PDF] retrieved 2020/07/05 original source: www.stabiloy.com/NR/rdonlyres/F06452BB-E816-4B70-ABE0-6E4B5E8317EA/0/GCCDN_pg67_PwrServ_USEB_90.pdf or contact General Cable at https://www.generalcable.com/ Telephone: +1.859.572.8000

About using USEB-90 cable, and assuming you're in Canada, you might want to see this Canadian electrical code on service entry wiring - a resource provided by the Alberta government:

• CANADIAN ELECTRICAL CODE - SUBJECT: Section 6 – SERVICES & SERVICE EQUIPMENT [PDF] retrieved 2020/07/05, original source: open.alberta.ca/dataset/7887ccca-d84e-4156-8e32-8f3ebd3ed66d/resource/dcc203d3-f30c-4d09-aaec-eef61285222a/download/452-cec-6-rev5.pdf

My goodness, Billy, I've never been mistaken for a computer-bot. Probably a bot would not make spelling errors when trying to respond when only a smartphone was at hand. Thank you for the feedback.

I'm back at the lab and have access to a keyboard for a more-detailed reply to your electrical service UF wire size question.

I also hope you'll help me avoid re-creating "off the cuff" information that we've got more thoroughly stated and organized in the article(s) to which I refer you.

[Click to enlarge any image]

At the page I recommended where we have a detailed table of SEC size vs amps for both aluminum and copper wires,

the SEC CABLE SIZE table in

SE CABLE & WIRE SIZE TABLES vs AMPS you'll see the data that I excerpted in my earlier reply to you. There is not a single "right" answer to your wire size question without a little more information.

In that more-thorough data, we see that choosing an electrical service wire size bears considering not only ampacity but also run length (as you know) and temperature rating of the wire.

For example the table notes that the rated ampacity for 2/0 or 00 depends:

Conductor Rating Temperature of 60 / 75 / 90 °C permits an amperage of 145 / 175 / 195 respectively for 2/0 - 00 COPPER

while for an ALUMINUM SEC wire the ratings were 115 / 135 / 150 Amps at those temperature ratings.

That's why you're going to find that not 2/0 wire (as you offered) bur rather 4/0 will be where you start for Aluminum SEC cabling if your electrical service size is 200 Amps.

Keep in mind that manufacturers may produce and certify aluminum wire - and mark it right on the wire - for ampacities different than the standard tables that we excerpted from the US National Electrical Code.

Please NOTICE that the manufacturer's remarks that I will site in the next posting are the same as in our table that I recommended, that's 4/0 Aluminum for a 200A service, and that's BEFORE going to a larger size that might be required for longer runs.

Thank you for the discussion - getting SEC wire size right is critical for safety and so your question can help other readers. Below: data for COPPER SEC wire as an example.

From a retail site example courtesy of Wire & Cable, illustrated here for underground feeder electrical service wiring, we have this specification:

Description:

Underground Secondary Distribution Cables are twisted assemblies of alloy 1350 aluminum conductors insulated with cross-linked polyethylene. THey are used in various underground applications in secondary distribution circuits.

Conductor:
Compressed Class B compressed stranded, 1350 series aluminum alloy.

Insulation:
Black cross-linked polyethylene (XLPE)

Assembly:
Phase conductors and neutral conductors are cabled together to form a twisted assembly.

Applicable Standards:
- UL 854: Service Entrance Cables
- ICEA S-105-692 Standard for 600 Volt Single Layer Thermoset Insulated Utility Underground Distribution Cables

Specifications*:

Phase Conductor Size: 4/0
Phase Conductor Insulation Thickness: 0.080 inches
Neutral Conductor Size: 2/0
Neutral Conductor Insulation Thickness: 0.080 inches

Outside Diameter: 1.38 inches
AC Resistance @ 75°C: 0.101
AC Resistance @ 90°C: 0.105
Inductive Resistance @ 60 Hz: 0.0265

Allowable Ampacity-Direct Burial: 301 Amps at 90°C

Allowable Ampacity-In-Duct: 240 Amps at 90°C

*Data provided on this page is subject to change based on different manufacturers variances.

A you found the wire markings a bit confusing - as do I - that same article translates - for example:

90°C rated wire is marked RHH, RHW-2, XHHW, XHHW-2, XHH, THHW, THWN-2, THW-2, THHN, USE-2

And that same page that I urge you to check out, includes a section titled

"Increase in Electrical Wire Size for Long Distance Wire Runs"

There you'll find a "distance" table that shows how to increase the wire size depending on run length and wire material - copper vs aluminum.

A 200A aluminum SEC running 150 ft needs 600 kcmil wire

If you want more detail, Detailed tables of copper or aluminum SEC cable sizes for long runs and where we give sizes for both single phase and three phase power are at

SE CABLE & WIRE SIZES FOR LONG RUNS

How to Translate the Electrical Wire Markings on NMC Cable

Where we see wire markings like XHHW, we need the decoder that I give just below, organized alphabetically rather than by the order in which letters usually appear on the wire jacket.

• 12/2 = 12-gauge, 2 conductors
• 14/2 = 14-gauge, 2 conductors, etc.
• 14/2 wG = 14-gauge, 2 conductors with ground, etc.
• 600 V = maximum voltage rating for typical residential NM electrical cable
• AL = aluminum conductor
• CU = copper conductor
• H = heat resistant insulation to 167°F.
• HH = high-heat resistant insulation to 194°F.
• N = Nylon-coated wire insulation, resistant to damage by exposure to petroleum chemicals, oil, gasoline, wire may be marked "NYLON"
• NM = non-metallic insulated wire or cable
• NM-B = non-metallic type B electrical cable, has greater heat resistance than straight NM cable.
• Sunlight Resistant - may be marked on such cables that resist damage from sunlight or UV (ultra-violet light)
• T = fire-resistant wire, made using a fire-resistant insulating material
• UF = Underground Feeder - rated for underground use or in wet locations.
• W = Wet-location use wire: approved for damp or wet locations, this wire is also OK to use in dry locations.
• X = flame-resistant wire insulation, made of a flame-retardant polymer

See details in

• Australia, IDENTIFYING WIRE and CABLE [PDF] retrieved 2020/07/05 original source: https://www.casa.gov.au/file/152106/download?token=oG0KQKBG
• UL: WIRE and CABLE MARKING and APPLICATION GUIDE [PDF] (2016), UL, Underwriters Laboratory, retrieved 2020/07/05 original source: https://legacy-uploads.ul.com/wp-content/uploads/2014/04/WC_MG.pdf

Finally:

Of course you want to follow the advice of your electrical power company and your onsite electrician who can see the actual site conditions and requirements - something that I, a mere semi-bot - cannot do from mere e-text sent via internet to our office here on the other side of the US Wall.

Your local electrical inspector is the final legal authority on what's permitted and acceptable for your installation.

Sorry if I'm being dense but that table is not consistent with what I've been told by local professionals or the reps from the power company. Are you a real person or a computer bot? Canned answers are not what I'm looking for.

Billy

Check the SEC CABLE SIZE table in

SE CABLE & WIRE SIZE TABLES vs AMPS

For 200A and 150 ft, and select a UF or Underground Feeder rated cable type. That's more critical than the number of strands.

You'll see that if you're using 2/0 wire for 200A you're almost certainly using copper, not aluminum.

An aluminum SEC for 200 A is typically 4/0 and underground will be labeled UF for "underground Feeder"

I need to install underground service entrance cable from the power company's pole to the 200 amp service entrance panel.on my house

The distance is roughly 150 feet. I'm told that 2/0 aluminum wire is appropriate for this connection.

However I see there are a number of different types of 2/0 aluminum wire such as SER and SEU, as well as various number of strands within each type...e.g. 2-strand, 2-strand with ground, 3-strand, etc. Exactly what type of wire should I be using for this job? .

i am running 500 ft underground cable and powering a 80 amp breaker

Mo

Assuming you're using the properly-sized conduit and SEC cabling, the answer is no. Be sure to see the wire size requirements discussed

at SE CABLE & WIRE SIZES FOR LONG RUNS for wire size for long runs - live link is given above on this page

I plan to put underground, in conduit, the power supply to my house. The distance is about 80 feet. Do I need to use larger than normally recommended wire to compensate for heat captured in the conduit? Thanx.

I want to install 200 amp direct burial wire to my barn that is 400 feet from the meter then in the future I would like to take the service from the barn to another barn that is 600 ft from the first barn . I want to do this in two steps because of cost . What size wire should I use for the first 400 ft in direct burial?

Rush

I'm not sure what question you are asking; but in most countries the wire from the utility company's pole to the service connection at the building at a masthead is the responsibility of and is installed by the electric company and is sized by them.

In some locations, particularly where long lines must be run from the utility company's power line across one or more poles across private property to a building, the property owner is responsible for installing the required poles; or service wiring may run underground.

Pole to sarvish cable

Greg

Using the online calculator itself cited at the article I'll cite just below to support a 200A load at the end of the run

you'd see an acceptable (under 3%) voltage drop of 2.80% with 350 kcmil wire
PROVIDED you're running 2 parallel sets of 240VAC cables

you'll find the longest runs we've documented along with wire sizes at

SE CABLE & WIRE SIZES FOR LONG RUNS for help with wire sizing.

I have a 650' run from the service pole and I'm not sure with the voltage drop what size wire is needed for a 200 amp service.

...

Continue reading at SE CABLE & BRANCH CIRCUIT WIRE SIZES vs AMPS for more wire size guidelines, or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see UNDERGROUND SERVICE LATERAL FAQs - questions & answers about wiring an underground electrical service entry, posted originally at the end of this page.

Or see these

Recommended Articles

• AMPS VOLTS DETERMINATION - home
• ELECTRICAL INSPECTOR SAFETY PROCEDURES
• SERVICE ENTRY WIRING & AMPACITY - home
  • ELECTRICAL SERVICE ENTRY DAMAGE
  • SE CABLE & BRANCH CIRCUIT WIRE SIZES vs AMPS
  • SE CABLE & WIRE SIZES FOR LONG RUNS - SEE THIS ARTICLE for wire size for long runs
  • SERVICE AMPACITY
  • SERVICE DROP
  • SERVICE GROUNDING DEFECTS
  • UNDERGROUND SERVICE LATERALS
• SIZE of WIRE REQUIRED for ELECTRICAL RECEPTACLES

Suggested citation for this web page

UNDERGROUND SERVICE LATERALS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

Or see this

INDEX to RELATED ARTICLES: ARTICLE INDEX to ELECTRICAL INSPECTION & TESTING

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