1 air conditioning breaker panels and disconnects
TRANSCRIPT
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Breaker Panel 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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Construction 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
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• 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
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• 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.
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• 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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Disconnect Switches 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
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• 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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Types of Wiring Types of Wiring
1.EMT2.Greenfield3.Seal-tite4.Romex5.BX6.MC 7.Knob and Tube
1.EMT2.Greenfield3.Seal-tite4.Romex5.BX6.MC 7.Knob and Tube
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Types of Wiring Types of Wiring 1. Electrical Metallic Tubing (EMT): rigid
galvanized metal conduit that can be bent and have wires run through it.
1. Electrical Metallic Tubing (EMT): rigid galvanized metal conduit that can be bent and have wires run through it.
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• Greenfield: Flexible metallic conduit, no wires inside; wires provided by installer.
• Greenfield: Flexible metallic conduit, no wires inside; wires provided by installer.
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• “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.
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• Romex: Trademarked name of NM (non metallic) cable- Wiring typically found in residential indoor applications. Solid wire, plastic sheathing.
• Romex: Trademarked name of NM (non metallic) cable- Wiring typically found in residential indoor applications. Solid wire, plastic sheathing.
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• SJ cord: stranded copper wire, rubber insulated, for use with portable tools and equipment.
• SJ cord: stranded copper wire, rubber insulated, for use with portable tools and equipment.
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• BX: generic term for flexible metallic conduit with wires inside, but no ground wire, sheathing itself was used for ground conductor.
• BX: generic term for flexible metallic conduit with wires inside, but no ground wire, sheathing itself was used for ground conductor.
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• MC (Metal Clad) cable: flexible metallic conduit, has wires inside, including insulated ground wire. More durable and resistant to damage than Romex.
• MC (Metal Clad) cable: flexible metallic conduit, has wires inside, including insulated ground wire. More durable and resistant to damage than Romex.
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• Knob and tube: Wiring found in very old homes. Can not be used, must be upgraded by electrician.
• Knob and tube: Wiring found in very old homes. Can not be used, must be upgraded by electrician.