Extension Cords

should electrically malfunction or break down, grounding provides a low resistance path to carry electricity away from the user, reducing the risk of electric shock. (See Figure A.)

2.The grounding prong in the plug is connected through the green wire inside the cord to the grounding system in the tool. The green wire in the cord must be the only wire connected to the tool’s grounding system and must never be attached to an electrically “live” terminal. (See Figure A.)

3.Your tool must be plugged into an appropriate outlet, properly installed and grounded in accordance with all codes and ordinances. The plug and outlet should look like those in the following illustration. (See Figure A.)

Figure A

Figure B

Double Insulated Tools: Tools with Two Prong Plugs

4.Tools marked “Double Insulated” do not require grounding. They have a special double insulation system which satisfies OSHA requirements and complies with the applicable standards of Underwriters Laboratories, Inc., the Canadian Standard Association, and the National Electrical Code. (See Figure B above.)

5.Double insulated tools may be used in either of the 120 volt outlets shown in the following illustration. (See Figure B above.)

1.Grounded tools require a three wire extension cord. Double Insulated tools can use either a two or three wire extension cord.

2.As the distance from the supply outlet increases, you must use a heavier gauge extension cord. Using extension cords with inadequately sized wire causes a serious drop in voltage, resulting in loss of power and possible tool damage. (See Table A.)

3.The smaller the gauge number of the wire, the greater the capacity of the cord. For example, a 14 gauge cord can carry a higher current than a 16 gauge cord. (See Table A.)

4.When using more than one extension cord to make up the total length, make sure each cord contains at least the minimum wire size required. (See Table A.)

5.If you are using one extension cord for more than one tool, add the nameplate amperes and use the sum to determine the required minimum cord size. (See Table A.)

SKU 91377

For technical questions, please call 1-800-444-3353.

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91377 specifications

Harbor Freight Tools 91377 is a versatile and robust tool that has gained significant recognition among DIY enthusiasts and professional tradespeople alike. This tool is designed to cater to a wide range of applications, making it an essential addition to any workshop or tool collection.

One of the standout features of the Harbor Freight Tools 91377 is its impressive power delivery. Equipped with a high-performance motor, this tool ensures efficient operation, allowing users to tackle various tasks with ease. The power is complemented by a user-friendly design, which ensures that even those with limited experience can operate the tool effectively.

The 91377 boasts a variable speed control feature, allowing users to adjust the speed according to the requirements of the task at hand. This versatility makes it suitable for a variety of materials, from wood to metal, ensuring that users can achieve precise cuts and finishes. Additionally, the tool is designed with safety in mind, featuring a built-in safety switch that prevents accidental activation.

Another key characteristic of the 91377 is its lightweight and portable design. This feature allows users to transport the tool effortlessly between job sites or store it conveniently when not in use. The ergonomic handle provides a comfortable grip, reducing user fatigue during extended periods of operation.

Durability is also a significant aspect of the Harbor Freight Tools 91377. Constructed from high-quality materials, this tool can withstand the rigors of daily use, making it a reliable option for both professionals and hobbyists. The design incorporates heat dissipation technology, which helps to prolong the lifespan of the motor by preventing overheating during intensive tasks.

Furthermore, the tool is compatible with a wide array of accessories, enhancing its functionality and versatility. Users can easily switch between attachments, allowing for various uses such as sanding, grinding, and polishing.

In summary, the Harbor Freight Tools 91377 combines power, versatility, and durability in one compact package. Its user-friendly design, variable speed control, and safety features make it an excellent choice for both novices and seasoned professionals. Whether for home improvements or professional projects, this tool is sure to deliver exceptional results. With its robust build and compatibility with numerous accessories, the 91377 stands out as an essential tool for any serious toolkit.