The s include NEMA electrical cords. They are designed mechanically differently to handle different types and flows of power. It’s essential to be aware of the distinctions and match-ups for all types of extension cords if you’re planning on working with custom extension cords.
IEC plugs, inverse from NEMA plugs, tend to be on either the plug or at the junction of the cord, which is opposite from the plug for wall. They’re separated by odd numbers and even ones that identify which plugs or jacks they belong to. These numbers that are odd like C5 or C15 are considered to be jacks and those with even numbers, such as C6 or C16 can be referred to as plugs. The plugs are paired to ensure that the odd one is before the even number.
NEMA plugs are a smaller class. After the number allocation is done, the plugs are split down into P and R types. It is a way of defining P as plugs, and Receivers as the plugs. 1-15 plugs have two prongs. Five-15s come with two prongs, and a grounded prong underneath, and 5-20s have one of two prong blades that rotate 90 degrees and the grounding prong. NEMA plugs work well for dealing with high watts and heat and this is the reason why they’re seen so standard around the electronics industry.
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