Professional cable manufacturer
UL 62 · CSA C22.2 No. 49 · NEC Article 400 · CSA FT2
SJOOW 12/3 Medium Duty Portable Cord 300V UL62 Rubber Cable
Junior service cord with a Class K rope-stranded bare copper conductor and a slim, oil-resistant EPDM / CPE construction — the 300V cord for hand tools, maintenance work and light equipment where weight and flexibility matter more than the higher voltage class.
300V AC
Rated Voltage
25 A
Ampacity at 30°C
−20 … +90°C
Flexible Range
12 AWG × 3
Conductors
↓ Download Datasheet (PDF)
UL 62 / CSA C22.2 No. 49 construction
CSA FT2 flame rating
Sample cut lengths available
OEM printing & packing
300V PORTABLE CORD
UL 62Flexible cords and cables
CSA C22.2 No. 49Canadian equivalent standard
NEC Article 400Portable cord usage rules
CSA FT2Flame test rating
300VJunior service cord class
Key Specifications
The essentials, at a glance
Everything an electrical engineer checks first on a junior service cord — before reading the full specification below.
300V AC
Rated voltage
25 A
Ampacity, 30°C basis
3
Conductors (2 + EGC)
12 AWG
Class K stranded Cu
EPDM / CPE
Insulation / jacket
+90°C
Max. conductor temp.
Product Overview
The light, flexible cord for tools and maintenance work
The SJOOW 12/3 is a three-conductor, 300V rubber portable cord built to the UL 62 flexible-cord construction and its CSA C22.2 No. 49 equivalent. The SJ prefix marks it as a junior service cord: same construction family as SOOW, one voltage class below it, and noticeably slimmer and lighter, which is what makes it the cord that gets carried from job to job with the tool it feeds.
The conductor is 65 × 30 AWG bare copper, Class K rope-stranded per ASTM B-174 — the same copper as the 600V cord of this size. Maximum DC resistance is 1.59 Ω/1000 ft (5.22 Ω/km) at 20°C, the finished cord measures about 0.43 in (10.9 mm) overall, and it weighs 146 lbs/1000 ft (217 kg/km).
Insulation is heat- and moisture-resistant EPDM rubber at a thinner wall than the SOOW version, inside a black CPE jacket that is also slimmer. Together they give the cord its oil, grease, ozone, water and UV (SUN RES) resistance, and keep it flexible down to −20°C. Maximum conductor temperature is +90°C for continuous operation.
Ampacity is 25 A per NEC Table 400.5(A)(1). The value comes from column A — 2 current-carrying conductors — because the green conductor in a 3-conductor cord is the equipment grounding conductor and is not counted as a current-carrying conductor. The table's basis is a 30°C ambient; above that, or where cords are bundled or run in a raceway, apply the correction and adjustment factors of NEC Table 400.5(A)(2). Ampacity follows the conductor size and not the voltage class, so the same 25 A applies to the 600V SOOW cord of this size.
More about the manufacturer: About SORIVO →
Key Features
Eight features that matter on a junior service cord
UL 62 / CSA C22.2 No. 49
Built to the UL 62 junior service cord construction and the CSA C22.2 No. 49 equivalent, with NEC Article 400 covering how the cord may be used.
Class K Rope Stranding
65 × 30 AWG bare copper, Class K rope-stranded per ASTM B-174 — the same flexible copper as the 600V cord of this size.
Thin-Wall EPDM and CPE
A 0.030 in (0.76 mm) EPDM insulation wall inside a slimmer black CPE jacket. That thinner wall is exactly what makes the SJ cord smaller and lighter than SOOW.
300V, 25 A Rated
300V junior service cord rated 25 A per NEC Table 400.5(A)(1) column A — 2 current-carrying conductors plus the equipment grounding conductor, on a 30°C ambient basis.
Oil, Ozone & Weather Resistant
Resistant to oil, greases, ozone, weathering effects, water and UV radiation (SUN RES) — the same rubber compounds as the heavy duty cord.
90°C Continuous
+90°C maximum conductor temperature. The full temperature range is −20°C to +90°C while flexible and −40°C to +90°C in a fixed installation.
CSA FT2 Flame Rating
Flame-retardant to CSA FT2 as declared for this construction, with MSHA flame-test performance available on request and test documents issued with the quotation.
Light and Easy to Carry
0.43 in (10.9 mm) overall and 146 lbs/1000 ft (217 kg/km) — a coil one person can carry, for tools that move with the job.
Applications
Where this cord is used
Hand tools, maintenance work and light equipment on 300V circuits — one cord construction, sized per project.
01
Portable Hand Tools
Drills, sanders, grinders and saws on 300V single-phase supplies, where a lighter cord is easier to work with all day.
02
MRO & Maintenance
Maintenance, repair and overhaul work where the cord is plugged in, moved and coiled again every shift.
03
Workshops & Assembly Benches
Bench tools, task lighting and small equipment in workshops where the cord drapes rather than runs in a tray.
04
Temporary Lighting
Task and inspection lighting strings, where the smaller diameter keeps a run of cords manageable.
05
Pumps & Small Machinery
Feeds to small pumps, fans and bench machinery on 300V circuits, sized for continuous current and voltage drop.
06
Rental & Event Power
Distribution to stands, stages and rental equipment that is connected and struck on every job.
07
Agriculture & Outdoor Work
Yard tools, small pumps and outbuilding equipment in damp conditions the CPE jacket is formulated for.
08
OEM Leads & Pendants
Power leads and pendant drops on light machinery, supplied cut to length with your own printing and terminations.
Technical Specifications
Full specification sheet
The complete parameter set — the same data our engineers quote from.
Table 1 SJOOW 12/3 dimensions and current rating
| Size AWG × cond. | Conductor stranding Class K per ASTM B-174 | Nominal outer diameter in (mm) | Approx. weight lbs/1000 ft (kg/km) | Max. DC resistance at 20°C | Ampacity at 30°C, A |
|---|---|---|---|---|---|
| 12 AWG × 3 | 65 × 30 AWG | 0.43 (10.9) | 146 (217) | 1.59 Ω/1000 ft (5.22 Ω/km) | 25 |
The 12 AWG × 3 row is the size this page covers, and it is the only SJOOW size quoted here. Ampacity is taken from NEC Table 400.5(A)(1), column A (2 current-carrying conductors), at a 30°C ambient: in a 3-conductor cord the green conductor is the equipment grounding conductor and is not counted as current-carrying. Above 30°C, or for bundled or raceway installations, apply NEC Table 400.5(A)(2). All dimensions and weights are nominal and may vary according to plant of manufacture; the data is provided for information only and does not create a binding obligation or liability.
Table 2 Construction and performance parameters
| General Information | |
| Product Name | SJOOW 12/3 Medium Duty Portable Cord 300V UL62 Rubber Cable |
| Primary Standard | UL 62 — flexible cords and cables |
| Further Standards | CSA C22.2 No. 49; NEC Article 400; ASTM B-174 (Class K rope-stranded conductor) |
| Rated Voltage | 300V AC — junior service cord class |
| Construction | 3 conductors — 2 current-carrying conductors plus 1 green equipment grounding conductor (EGC) |
| Usage Rating | Hard usage — one grade below the extra-hard usage class of the 600V SOOW cord; the applicable rating for the selected size and routing is confirmed on the quotation |
| Conductor | |
| Conductor Material | Bare copper, fully annealed per ASTM B-174 |
| Conductor Type | Class K rope-stranded, extra-flexible |
| Conductor Stranding | 12 AWG: 65 × 30 AWG |
| Max. DC Resistance | 12 AWG: 1.59 Ω/1000 ft (5.22 Ω/km) at 20°C |
| Insulation & Jacket | |
| Insulation Material | EPDM (ethylene propylene diene monomer) rubber — heat and moisture resistant |
| Insulation Thickness | 12 AWG: 0.030 in (0.76 mm) — a thinner wall than the SOOW cord of the same size |
| Jacket Material | CPE (chlorinated polyethylene), black — oil, ozone and weather resistant; slimmer than the SOOW jacket of the same size |
| Core Identification | Black, white, green (EGC) |
| Nominal Outer Diameter | 12 AWG × 3: 0.43 in (10.9 mm) |
| Approx. Weight | 12 AWG × 3: 146 lbs/1000 ft (217 kg/km) |
| Jacket Marking | SORIVO SJOOW 12 AWG (3.31 mm²) 3/C 300V UL 62 CSA C22.2 No. 49 FT2 <year> — or per customer requirement |
| Electrical Ratings | |
| Current Carrying Capacity | 12 AWG × 3: 25 A per NEC Table 400.5(A)(1), column A (2 current-carrying conductors counting the EGC out), 30°C ambient |
| Ampacity Derating | Per NEC Table 400.5(A)(2) — ambient temperature correction and conductor-count adjustment for bundled or raceway installations |
| Test Voltage | 2500 V core to core, as a routine production test to UL 62 |
| Voltage Drop (12 AWG) | ≈ 10.44 V/A/km for the complete circuit loop at 20°C conductor temperature, calculated from the maximum DC resistance |
| Temperature & Environmental | |
| Temperature Range | Flexible: −20°C to +90°C; fixed installation: −40°C to +90°C |
| Max. Conductor Temperature | +90°C continuous |
| Oil & Grease Resistance | Oil-resistant EPDM insulation and CPE jacket per the UL 62 / CSA C22.2 No. 49 construction |
| Water & Weather Resistance | Weather-resistant jacket; resistant to weathering effects and water |
| Ozone Resistance | Resistant to ozone |
| UV Resistance | Resistant to UV radiation (SUN RES) — suitable for outdoor service in dry or damp locations |
| Flame Rating | Flame-retardant to CSA FT2, as declared for this construction |
| MSHA Flame Test | MSHA flame-test performance available on request. The MSHA file number in circulation belongs to the third-party cord makers whose data sheets publish it, so we do not reproduce it as our own; our own MSHA documentation and flame-test records are supplied with the quotation for the exact construction |
| Min. Bending Radius | Manufacturer-recommended: 10 × overall diameter when flexible, 6 × overall diameter in a fixed installation |
| Packaging & Logistics | |
| Packaging | Wooden drum / coil / spool |
| Standard Length | 250 ft / 500 ft / 1000 ft |
| MOQ | 1,000 ft |
| Lead Time | 5–15 working days |
Final selection should be based on load current, circuit voltage, cord length, ambient temperature, installation method and the applicable local code. Certification scope and the applicable usage rating are confirmed in writing against the factory documents for the selected construction before the order is placed.
Table 3 SJOOW versus SOOW at the same 12 AWG size
| Same construction family, two voltage and duty classes | ||
| Parameter | SJOOW 12/3 (this page) | SOOW 12/3 (600V) |
| UL 62 letter code | SJ — junior service cord | S — service cord |
| Rated voltage | 300V AC | 600V AC |
| Usage rating | Hard usage | Extra-hard usage |
| Conductor stranding | 65 × 30 AWG, Class K | 65 × 30 AWG, Class K |
| Insulation thickness (EPDM) | 0.030 in (0.76 mm) | 0.045 in (1.14 mm) |
| Nominal outer diameter | 0.43 in (10.9 mm) | 0.595 in (15.1 mm) |
| Approx. weight | 146 lbs/1000 ft (217 kg/km) | 224 lbs/1000 ft (333 kg/km) |
| Ampacity at 30°C | 25 A | 25 A |
| Test voltage | 2500 V core to core | 2500 V core to core |
| Min. bending radius | 10 × OD flexible / 6 × OD fixed | 10 × OD flexible / 6 × OD fixed |
| Temperature range | −20°C to +90°C flexible / −40°C to +90°C fixed | −20°C to +90°C flexible / −40°C to +90°C fixed |
| Flame rating | CSA FT2 | CSA FT2 |
At the same 12 AWG conductor size the SJOOW cord is 27.7% smaller in overall diameter (10.9 mm against 15.1 mm) and 34.8% lighter (146 against 224 lbs/1000 ft). Ampacity is identical because it follows the conductor, not the voltage class — the difference between the two cords is the voltage rating and the usage class, plus the thinner wall that makes the junior cord smaller.
Certificates & Standards
Verify before you buy — we make it easy
UL 62 / CSA C22.2 No. 49
This SJOOW 12/3 is built to the UL 62 junior service cord construction and the CSA C22.2 No. 49 equivalent. Certificate and listing scope for the selected construction are supplied in writing with the quotation.
Request certificate copy →CSA FT2 and MSHA flame test
Flame-retardant to CSA FT2 as declared for this construction. MSHA flame-test performance is available on request: the MSHA file number in circulation belongs to the third-party cord makers whose data sheets publish it, so we do not reproduce it as our own, and our own MSHA documentation and flame-test records are supplied with the quotation for the exact construction.
Request test report →RoHS-2 and material compliance
Compliant with RoHS-2 (European Directive 2011/65/EU). Compound and conductor declarations for the selected construction are available on request.
Request declaration →
Transparency note: certification status and exact scope should always be confirmed against the certificate for the selected cable construction. No third-party approval file number is reproduced on this page. We provide our own certificate and test reports with every quotation — no blank promises.
Quality & Factory
Made in a real cable factory, tested before it ships
Every reel of junior service cord is produced under controlled processes and released against the applicable UL 62 construction requirements.
- 1Incoming material control — bare copper wire and EPDM / CPE compounds are checked before production starts.
- 2In-line process monitoring — strand count, insulation eccentricity and jacket thickness are tracked during extrusion.
- 3Routine electrical tests — on-line spark test plus a 2500 V core-to-core production test and conductor resistance check.
- 4Batch documentation — conductor resistance, dimensions and test records are retained for every production batch.
19+
countries served
60+
industrial & site projects
100%
routine test before shipment
How to Order
From inquiry to loaded reel in 5 steps
Send Inquiry
Tell us the AWG size, conductor count, colour, quantity and destination market.
Confirm Construction
We confirm the SJ construction, flame and mining test scope, and quotation within one working day.
Sample Evaluation
Cut-length samples for qualification — stock items within a few working days.
Bulk Production
5–15 working days lead time with batch test documentation.
Delivery & Support
Wooden drum packing, shipping documents and after-sales support.
FAQ
Questions buyers ask before ordering
The letters come from UL 62. SJ is junior service cord, which is why this cord is rated 300V rather than 600V. The two Os mean the insulation and the jacket are both oil-resistant, and the W means the cord is weather and water resistant. Because the compounds are thermoset rubber rather than thermoplastic, the code stays SJOOW and never gains a T. The construction family is the same as SOOW; the SJ class simply uses thinner walls and carries a lower voltage rating.
25 A is the NEC Table 400.5(A)(1) value for 12 AWG cord taken from column A, which covers 2 current-carrying conductors, on a 30°C ambient basis. A 3-conductor cord has two current-carrying conductors plus the green equipment grounding conductor, and the grounding conductor is not counted when the ampacity is determined. If the ambient is above 30°C, or the cords are bundled or run in a raceway, the correction and adjustment factors of NEC Table 400.5(A)(2) have to be applied on top. Ampacity follows the conductor size and not the voltage class, so the same figure applies to the 600V SOOW cord of this AWG.
At the same 12 AWG size the two cords carry the same 25 A and have the same copper — 65 × 30 AWG Class K. The difference is the voltage class, the usage class and the wall thickness. SJOOW is a 300V junior service cord at 0.43 in (10.9 mm) overall and 146 lbs/1000 ft, while SOOW is a 600V extra-hard usage cord at 0.595 in (15.1 mm) and 224 lbs/1000 ft. In practice: choose SJOOW for hand tools and maintenance work on 300V circuits where a lighter, more flexible cord is easier to live with, and step up to our SOOW 12/3 portable cord when the system voltage is 600V or the cord has to survive extra-hard usage.
+90°C for continuous operation. The full ambient range is −20°C to +90°C while the cord is being flexed and −40°C to +90°C for a fixed installation, so the same cord can be used on a cold site and left in place on a bench. The limit that matters for ampacity is the 90°C conductor temperature, combined with the 30°C ambient basis of the NEC table.
Outdoors, yes — the CPE jacket is resistant to oil, greases, ozone, weathering effects, water and UV radiation (SUN RES), which is what an outdoor or damp location needs. The construction is intended for indoor and outdoor use in dry or damp locations, which is the more conservative wording of the UL 62 usage classes. Direct burial is a different question: a portable cord is not rated for direct burial and this construction is not offered for it. If the run has to go underground, use a cable listed for direct burial.
The 300V rating covers the usual single-phase hand-tool and light-equipment circuits, which is where a junior service cord belongs. It does not cover 480V or 600V distribution — for those, and for any circuit where the cord is expected to take extra-hard usage, the 600V SOOW cord is the correct choice. If you tell us the system voltage and the equipment, we will confirm which class your application needs before quoting.
Yes. The construction is flame-retardant to CSA FT2, and MSHA flame-test performance is available on request. The MSHA file number that circulates for this cord type belongs to the third-party cord makers whose data sheets publish it, so we do not reproduce it as our own; our own MSHA documentation and flame-test records are supplied with the quotation for the exact construction you are buying. Ask through the form below and we will forward the scans.
Yes. Sorivo can arrange sample cut lengths for qualification and project evaluation. Sample availability and lead time depend on the required size, colour and current stock. Stocked sizes may be available within a few working days, while customized constructions may require additional production time.
Need a sample of this junior service cord?
Tell us the AWG size and quantity — we reply within one working day.
Get a Free Quote
Send your portable cord requirement
The more detail you give, the faster and more accurate our quotation. Our engineers reply within one working day.
- Conductor size and count (e.g. 12 AWG × 3) and quantity in feet or metres
- Voltage class: 300V SJOOW or 600V SOOW
- Application and environment: hand tools, bench work, outdoor or damp
- Cut lengths, reel lengths and any printing or colour requirement
- Destination market, and whether a sample cut length is needed
Inquiry received
Thanks — our engineers will reply within one working day.
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