Direct connection of single-strand copper wires. First, cross the stripped ends of the two wires in an X shape, then twist them around each other 2–3 turns and straighten the wire ends. Next, tightly wrap each wire end around the other core wire 5–6 turns, then cut off the excess wire ends.

Single-strand copper wire direct connection: First, insert a core wire of the same diameter into the overlapping part of the cores of the two wires, then tightly wrap a bare copper wire with a cross-sectional area of about 1.5mm² over it, with a wrapping length of about 10 times the wire diameter. Next, fold back the ends of the cores of the wires being connected, then continue to wrap the bare copper wire at both ends 5–6 more turns before cutting off the excess wire ends.

Connection method for large cross-section single-core copper conductors: For connecting single-core copper conductors of different cross-sections, first tightly wrap the core of the thinner conductor around the core of the thicker conductor for 5–6 turns. Then fold back the end of the thicker conductor's core and press it firmly onto the wrapped layer. Finally, continue wrapping with the core of the thinner conductor for 3–4 more turns on top and then cut off the excess wire.

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