I needed this cord to connect a security light to an outside outlet so I bought it specifically to cut and splice into a traffic/security light . The insulation is heavy, the wires are strong and so far it has held up well despite the bad weather (rain and snow). I expect it will work fine with any outside extension, but the connector is heavy, the weight of the whole is good, and it's very easy to cut and splice if you need it for something like that. Each wire (positive, neutral and ground) is well insulated with the outer rubber as well as the inner insulation after you cut it. Not all brands have the internal insulating film that they have.
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