The electrical code states that any splice in a wire, the insulation over the splice has to be equal to or greater than the insulation on that of the rest of the wire.
So what ever type of splice that you use make sure that you insulate it well.
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Electricity does not flow wires into your home, wires direct the flow of current into your home.
A home electrical system is joined to the electric company's system at the meter box or the service entrance. This is where the incoming electrical supply from the utility company is connected to the home's electrical panel through the service entrance wires. From there, the electricity is distributed throughout the home via circuits and outlets.
In home wiring, hot wires are typically colored black or red, while ground wires are usually green or bare copper. In computer wiring, ground wires are typically black, while hot wires are often colored according to industry standards, such as red or yellow.
The quickest and easiest way to check it to go to your distribution panel. Turn the main breaker to the off position. Remove the front cover plate. Look at the colour of the wires that are connected to the breakers. Silver coloured wires are aluminium where as copper coloured wires are of course copper.Aluminium was only used for branch circuits for a few years in the early 70's when the price of copper went extremely high to purchase. The aluminium wiring needed special care in preparation for splicing and terminations. Many connections overheated if this perpetration was not followed. Once the price of copper reduced in price the manufactures of home wiring cables went back to using copper wire.
Typically, two main wires enter a home through a utility pole: one for electricity and one for telecommunication services like telephone or internet. Some homes may have additional wires for cable television or other services.