1 Air Conditioning Breaker Panels and Disconnects

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4 Breaker Panel Function: Distribute electricity to individual circuits Each branch has rated amperage Breakers must be reset by hand Main breaker will control voltage to whole panel Function: Distribute electricity to individual circuits Each branch has rated amperage Breakers must be reset by hand Main breaker will control voltage to whole panel

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6 Construction Panels can be built with or without main breaker Rated for amperage –How many amps the main lug can handle –Amps the main breaker can handle Phase –Single –Three Panels can be built with or without main breaker Rated for amperage –How many amps the main lug can handle –Amps the main breaker can handle Phase –Single –Three

7 Neutral strip with screws Ground strip with screws Each breaker should be marked Lock out for safety Neutral strip with screws Ground strip with screws Each breaker should be marked Lock out for safety

8 Breakers will be: –Single pole –Double pole –Three pole Styles are snap in or clamp on Can be in “On”, “Off” or “Tripped” position. Breakers will be: –Single pole –Double pole –Three pole Styles are snap in or clamp on Can be in “On”, “Off” or “Tripped” position.

9 When breaker is tripped, handle will usually move halfway between on and off position, or a red mark will appear. To reset, breaker must be moved to off position, then back on. When breaker is tripped, handle will usually move halfway between on and off position, or a red mark will appear. To reset, breaker must be moved to off position, then back on.

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12 Disconnect Switches All system should have another means to disconnect power Should be within service mans reach Can be mounted to the outside of the unit Uses double pole double throw to 208/240 applications Uses single pole single throw for 120volt All system should have another means to disconnect power Should be within service mans reach Can be mounted to the outside of the unit Uses double pole double throw to 208/240 applications Uses single pole single throw for 120volt

13 Can be fused or non-fused depending on application May be have lever or pullout Can be fused or non-fused depending on application May be have lever or pullout

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19 Types of Wiring 1.EMT 2.Greenfield 3.Seal-tite 4.Romex 5.BX 6.MC 7.Knob and Tube 1.EMT 2.Greenfield 3.Seal-tite 4.Romex 5.BX 6.MC 7.Knob and Tube

20 Types of Wiring 1.Electrical Metallic Tubing (EMT): rigid galvanized metal conduit that can be bent and have wires run through it.

21 Greenfield: Flexible metallic conduit, no wires inside; wires provided by installer.

22 “Sealtite” flexible conduit : Used outdoors to provide weather proof connection from A/C condensing unit to disconnect switch. Can be purchased as a “whip”, usually 6’ long with wires inside. “Sealtite” flexible conduit : Used outdoors to provide weather proof connection from A/C condensing unit to disconnect switch. Can be purchased as a “whip”, usually 6’ long with wires inside.

23 Seal-tite

24 Romex: Trademarked name of NM (non metallic) cable- Wiring typically found in residential indoor applications. Solid wire, plastic sheathing.

25 SJ cord: stranded copper wire, rubber insulated, for use with portable tools and equipment.

26 BX: generic term for flexible metallic conduit with wires inside, but no ground wire, sheathing itself was used for ground conductor.

27 MC (Metal Clad) cable: flexible metallic conduit, has wires inside, including insulated ground wire. More durable and resistant to damage than Romex.

28 Knob and tube: Wiring found in very old homes. Can not be used, must be upgraded by electrician.

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