Will this work for a 230 volt 3.7 hp air compressor?

Yes. It will work for any single phase 240v with a steady state current draw of 30amps or less needing a 3 wire connection (black + red+ ground)

Do you know if i can use it to backfeed house, gen l6-30p to 10/3 > ac 30amp dis-connect? thank you for your help.

I’m not sure I understand the question. If you use a 3 wire twist lock you will only have 120 volts, you need 4 wires for 240. Why do you want 30 amps for a 120 volt circuit?

what type of prongs are on the unit. what type of receptacle is needed? e.g. nema 6-30r or ???

The prong on this unit is NEMA L6-30P, so the receptacle needed is NEMA L6-30R.

Trying to power server from 240v 30a source. psu takes 110-240v. receptacle is nema l6-30 and need standard american 3 prong female. safe / unsafe?

Need more info to help you. Check if your source is 240/208 volts or 120? As #10 this pre-wired cord has only 3 wires, neutral, hot & ground it will carry up to 30 amps. The plug you add should also be 30 amp comparable but will only transmit either 240/208 or 120 not both. For both you’d need 4 wires & appropriate plugs.

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Conntek 29139-180 15-Feet Locking Power Cord for Model L6-30P to Model SJTW 10/3, 30-Amp, 250-volt

Product ID: 22399107

Details

Brand
Conntek
Color
Black
Connector Gender
Plug Format
Type B
Voltage
250 Volts

⚡250V heavy-duty voltage

🔌30A high-capacity power

🌧️All-weather water-resistant

R2037

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

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Description

🔒 Power up with confidence — lock in reliability every time!

GENEROUS REACH - 15-foot length offers flexible placement without compromising power integrity.
BUILT TO ENDURE - 10/3 gauge SJTW pure copper cable resists overheating, delivering reliable long-term performance.
LOCK LOAD POWER - NEMA L6-30 locking plug ensures secure, no-slip connection for uninterrupted energy flow.
CERTIFIED CONFIDENCE - UL & cUL listed for guaranteed safety and compliance in professional environments.
WEATHERPROOF WARRIOR - Water-resistant design keeps your power running safely through rain, snow, or shine.

The Conntek 29139-180 is a 15-foot, 30-amp, 250-volt locking power cord featuring a NEMA L6-30 male plug to bare wire connection. Constructed with durable 10/3 gauge SJTW pure copper cable, it offers superior heat resistance and all-weather water resistance. UL and cUL listed, this heavy-duty cord is designed for secure, long-lasting performance in demanding electrical applications.

Reviews

S**N

Well Made For Up To 30 Amp Use

I do like for quality of this cord for use as 249 volt for use of medium EV charging speed on my dual voltage EV charger. I will pull around 15 to 16 amp on 20 amp plug. Remember; I will treat it for green as white as the neutral ground on one wire. The former solid white wire will become red as 'Y' live plus Black is 'X' live wire only for 240 volt.

29.12.2025

J**D

Would recommend

Easy to install, durable, works well.

23.03.2025

G**K

Quality

Made well, better price than box stores

6.10.2024

G**K

Solidly built heavy duty cord

Needed to replace/beef up a heavy duty table saw cord. This cord is plenty beefy for large 220V shop tools and locks into the receptable solidly, and has some extra length.

10.11.2025

N**M

Well made

Well made cord and it was exactly what I needed.

8.09.2025

M**S

👍

It’s good quality, however have to return it because it was the I order the wrong size..

13.09.2023

A**.

Sturdy wire for the Tempware electric garage heater.

Just what we needed for connecting the 240Volt 7500 watt heater. Works like a charm.

21.04.2024

T**T

Great for the Job

I this product because I didn’t have to splice a cable it came just as it is which works fine for what I needed to connect from my well water pump to my generator during a power outage.

18.11.2024

M**N

Super

A part le retard de livraison, tout est super bien!!

11.12.2025

R**Y

Good quality

Cable was as described and works great for my little cabin when I want power via generator.

12.01.2022

C**N

Prix et qualité

Excellent, le cordon électrique est parfait pour ma génératrice

17.03.2023

P**E

Fil très haut solide

Pour une génératrice de 12,000 watts, comme accessoire

6.07.2023

T**S

CORONET

AAAAA++++++

20.07.2021

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TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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3 days ago

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R2037

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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The delivery time was excellent, and the packaging was secure.

2 months ago

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Brand	Conntek
Color	Black
Connector Gender	Male-to-Female
Gauge	10
Item Length	180 inches
Plug Format	Type B
Plug Type	Type B
Voltage	250 volts

Conntek 29139-180 15-Feet Locking Power Cord for Model L6-30P to Model SJTW 10/3, 30-Amp, 250-volt

Details

Details

Description

Specifications

Reviews

Common Questions