Mend or extend aluminum wire often found in older buildings. This wire isn’t recommended for new wiring, since it’s more likely to overheat than copper when conducting electricity. However, it’s safer to maintain existing aluminum wire with aluminum rather than mixing materials. Building wire is also known as branch circuit wire.

This wire has an outer layer of nylon insulation that won't degrade from oil and water. It’s designed to be pulled through conduit without pulling lubricants. THHN and THWN-2 designated, this wire can be used in damp places.

Power motors on moving gantries and cranes with this cable that flexes millions of times without breaking. It’s made for constant motion, with finely stranded conductors twisted like a rope to resist wear from bending.

Lay the main wire into your tap on the first try instead of poking and threading. The tap wire connects parallel to the tap or at 90°, so the tap will slide into your setup at different angles. Strip both wires and slide off the screw plate before installation. Tighten the set screws onto both wires for a secure connection.

Covers—These covers fully insulate the tap so moisture can't reach the wire. They snap shut so you don't have to tape them down.

These cables have thick wires for a fast start on large trucks and industrial vehicles. The clamps are color-coded black (negative) and red (positive).