We all know that the power line is used to transmit current. Generally, the mode of current transmission is point-to-point transmission. Because different electrical appliances are equipped with different power lines, there are more and more kinds; Among them, AC power cord is commonly used, which can be divided into American UL power cord, European ved power cord, etc. many people ask what is the standard of American UL power cord?
UL power cord plug: 120V 50 / 60Hz is divided into two core wire, three core wire, polarity and non polarity. The copper strip of power cord plug in the United States must have a rubber sleeve; The two-core wire printing line represents the live wire; The large pin of the polarity plug is the zero line, and the small pin is the live line (the concave and convex surface of the power line is zero, and the round surface of the line is the live line).
UL power lines include nispt-2 double-layer insulated flat line, spt-1w single-layer insulated flat line with groove, sjtw waterproof power line, sjto oil proof power line, etc. Their criteria are as follows:
(1) Nispt-2: nispt refers to double-layer insulation, - 2 surface two core wire core insulation and outer layer insulation.
(2) XTV and SPT: single layer insulation layer, - 2 surface two core wire (wire body with groove, outer insulation directly wrapped with copper core conductor).
(3) Spt-3: it refers to single-layer insulation with ground wire, - 3 refers to three core wire (the wire body is provided with groove, and the ground wire in the middle is double-layer insulation).
(4) SPT and nispt are flat wires. SVT is round wire with double-layer insulation, core insulation and outer insulation.
The above is the standard of UL power cord. What is the difference between AC power cord and DC power cord? In fact, AC power cord is mainly used for AC power supply, while DC power cord is used for DC power supply, so we should see clearly.
