![]() The most appropriate knockout plug for the wiring can then removed and the cable connector installed. Once the spot is picked, a 240 Volts circuit breaker can be installed and secured in place in the OFF position. ![]() With this done, the front cover of the large panel can be removed, exposing a whole bunch of wires and breakers. This will switch off everything electrical in the house, so the work should be care fully planned ah ead to minimize the extent of the interruption to app liances like fridges and freezers. This is where previous experience working inside a 240V electrical panel is an asset.įirst of all, turn OFF the panel’s main breaker at the very top rated between 100 and 250 Amps (Figure 6). ![]() Step 4 - Wire the AC to the Electric Panel If this was an addition to an existing AC unit, the dedicated breaker can be turned back on-ready to go. Remember to put the covers back once you're done. ![]() The white wire of the cable should be remarked a different color to indicate it's not being used as a neutral wire. In that case, the white and black wires would go to the contacts and the ground wire to the ground block. If this is a standard 240v installation, you may be using two wire cable with ground to supply power to the disconnect. The two ground wires go to the ground term inals, and, finally, the two white neut ral wires are s imply connected together inside with a wire nut. Remove the double-contact pullout inside (Figure 6) to open both contacts of the switch.įigure 7 is the same switch with all covers removed, showing where to connect the wires so both red wires go to one set of contacts, while the black wires go to the other set of contacts, which can both be disconnected by pulling a handle. Figure 5 shows a pullout switch with the cover lifted and. The disconnect switch is shown in Figures 5, 6, and 7. With this done, the cover can be put back on the AC’s electric box. The wires can now be connected to their respective terminals inside the AC’s electrical box by matching their colors with the colors of the wires already in place. One end of this cable is then inserted and secured into the AC unit’s electric p anel, w hile the other end is fixed in the same manner into the disconnect switch, where it is secured at both ends with cable connectors. Then, cut another cable of the same rating with about 16-20 extra inches and prepare it at both ends in the same manner. 75 inches (19 mm) of their insulation before inserting the cable into the cable connector and clamping it in place in the disconnect box. Passing the cable through can be done more easily from the inside when the panel is some distance away.įor either case, this cable, the feed line from t he main electric panel, has to be prepared by stripping some of its external jacket to expose the wires. The hole can then be drilled to its full size to a ccommodate the cable. It’s a good practice to pre-drill a smaller hole with a long drill bit to make sure it’s where it should be and avoid unpleasant surprises. A hole must be drilled through the wall to bring the cable inside. With the breaker turned OFF, the wires can be disconnected and the cable removed from the e lectrical compartment of the AC Unit.įor a new AC installation, a cable must be installed from the disconnect to reach up to the main electric panel. Step 2 - Prepare to Wire the Disconnect Switch If the disconnect is added to an existing AC Unit, it should be within reach of the already existing cable, so only a short cable is needed to bridge the switch to the AC unit. De pending on wh ere the cables will be inserted into the switch box, the proper knock-out plugs can be removed once you've mounted the switch, and cable connectors can be fastened into place. The disconnect switch should be screwed into place on the wall next to the AC unit. If you're not sure what switches govern which areas, play it safe and shut the power down completely. ![]() For a new installation, it is the main breaker in Figure 4 instead that will be turned off in Step 4. ![]()
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