Hello,
Since Interpower offers standard cord lengths and specialized lengths as part of its value-added services, it is critical to know how Interpower measures cord length—especially when customers need longer or shorter cord and cord set lengths in their unique electrical design.
Measuring a Power Cord
Interpower measures a power cord from the face of the connector or plug, not including the pins, to the end of the cable. Interpower uses this method for all power cords.
Measuring a Cord Set
In a recent InfoPower post, Dan Ford, Interpower’s Technical Support Specialist, explained how cord length could directly affect current leakage, EMI, and potential voltage drop. In its effort to “delight” its customers, Interpower offers standard cord lengths as well as made-to-order lengths for unique applications.
When using a shrouded male plug, the measurement starts from the edge of the shroud to the face of the connector.
Standard and Specialized Lengths
When manufacturing standard or specialized power cords and cord set lengths, Interpower follows North American and international standards, along with minimum and maximum lengths per country regulations and standards. There are application limits that may apply. For example, cords over 50 feet in the United States and Canada will have the amperage rating derated. For international applications, one must be aware of issues such as voltage drop, leakage current, and heat buildup.
The standard tolerances for overall length of cord that Interpower follows include:
| Length |
Standard Tolerance |
| 0-2.99 ft. (0—913 mm) |
+/- 1 in. (25mm) |
| 3-5.99 ft. (914—1827mm) |
+/- 2 in. (51mm) |
| 6-11.99 ft. (1828—3656 mm) |
+/- 3 in. (76mm) |
| 12-19.99 ft. (3657—6095 mm) |
+/- 4 in. (102mm) |
| 20–49.9 ft. (6096—15210 mm) |
+/- 6 in (152mm) |
| 50+ (15240+ mm) |
+/- 12 in. (305mm) |
Additional Resources
For more information on power cords and cord sets, see the Featured Product page. For information on the cord set configurations allowed, see the International Cord Set Configurations chart and the North American Cord Set Configurations chart. To assist in determining cord specifications per a specific country or region, see North American Power Cords and Cord Sets and International Power Cords and Cord Sets. To identify which plug patterns are used in specific countries, see the Guide to Worldwide Plug/Socket Patterns & Power Mains (Single-Phase).
Interpower offers a 1-week U.S. manufacturing lead-time on non-stock Interpower products, same day shipping on in-stock products, and no minimum order or dollar requirements. Blanket and scheduled orders along with value-added services are available. If you have questions, Interpower offers free technical support. You can check the website at www.interpower.com, e-mail sales@interpower.com (United States) or uk@interpower.com (United Kingdom) or contact Customer Service in the United States at (800) 662-2290 or in the United Kingdom at +44 (0)1908 295300.
