Chapter 8 Basic Electricity Chapter 8—Basic Electricity 8-27 Figure 8-27: Wire nut Figure 8-28: Strap and wrap wire Obviously this procedure is very important if the circuit breaker and remote switch are in different rooms than the equipment you are working on. You do not want some helpful person thinking they found the problem with the heater and turning on the breaker in the other room while you are hooking the black wire from the primary control to the L1 wire. Practical tips Splicing wires To splice wires first strip the wires with a wire-stripping tool. (Don’t use a knife; it might nick the wire, reducing its electric carrying capacity.) Slip the wire into the correct hole in the stripper, squeeze, twist, and pull off the insulation. Next hold the stripped wires together and grab the ends with lineman’s pliers. Twist clockwise, making sure all wires turn. Twist them together like a candy cane into a neat looking spiral. Now snip off the end leaving enough exposed metal so the wire nut will just cover it. (About a half inch is good.) Now slip on an appropriately rated wire nut as far as it will go and turn it clockwise until tight, Figure 8-27. Finally wrap electrical tape around the bottom of the nut and wires. Hooking wires to a terminal Before you start, many devices come with the terminal screws unscrewed. Screw in any terminal screws for terminals you are not going to use. Now you are ready to hook up your wires. Strip about three quarters of an inch of insulation from the wire end. Then using long nose pliers grab the wire just above the insulation and bend it back at about a 45-degree angle. Move the pliers up about a quarter inch from the insulation and bend again in the opposite direction about 90 degrees to start a loop. Now move the pliers another quarter inch and bend the wire into a question mark”?”. Leave an opening in the end just big enough for the terminal screw. (You can buy a wirebending screwdriver to make this job easier.) Figure 8-28. Make sure the terminal screw is unscrewed far enough, and then slip the loop over the screw threads, with the loop running clockwise. Use the long nose pliers to squeeze the loop around the terminal, and then tighten the screw. You should never attach two or more wires to one terminal screw. To make a multiple connection, make a “pigtail” wire by cutting a six-inch length of wire, strip both ends, splice the multiple wires to one end, and then attach the other end to the terminal screw. Armored cable To cut armored cable, bend it about one foot from the end and squeeze the bend until the armor breaks apart slightly. If you have trouble, use a pair of channellocks to squeeze the wire. Figure 8-29.
NORA Oilheat Technicians Manual
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