Run power over rough surfaces—this wire has thick insulation that stands up to wear and tear. It’s flame rated, which means it meets requirements for preventing the spread of fire. Also known as hook-up wire.

Wire with braided aramid fiber outer and silicone rubber inner insulation is best for your most rugged applications, such as wiring inside a motor. Its outer layer protects the wire if it’s cut or struck. Meanwhile, its inner layer makes it flexible enough to bend in tight spots. It’s also known as silicone rubber motor lead (SRML) wire.

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