Understanding Circuits in Software

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Understanding Circuits
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underneath the dishwasher so that it can be pulled out for servicing without disconnecting the power supply Water pump: The water pump is usually supplied by a 240 volt 15 or 20 amp circuit The supply cable consists of two #12 hot conductors and one number 12 ground conductor Connect the two hot wires to a 2 pole circuit breaker and the ground conductor to the ground bar The other end of the circuit goes to a service switch located near the pump The switch must be a 2 pole unit so that it cuts all power to the pump when in the off position The circuit from the switch then goes to the pressure switch that controls the pump Oil-fired furnace or boiler: These units are wired the same way as an oil-fired water heater They are supplied by a 120 volt 15 or 20 amp circuit The circuit must go through the safety switch, thermal cutout, and service switch before connecting to the terminal box on the oil-fired unit Split-wired branch circuit: This is where two branch circuits supply power to each plug on a duplex receptacle This circuit is supplied with four number 12 conductors Black and red are hot and connect to a 2 pole 15 or 20 amp circuit breaker White connects to the neutral bar and green or bare connects to the ground bar The circuit runs from the panel to the first duplex receptacle in the circuit The jumper tab must be removed from the hot side of the receptacle Red connects to one brass screw and black connects to the other brass screw The neutral wires must be pigtailed with the pigtail connected to the neutral side of the receptacle Grounds must also be pigtailed with the pigtail connected to the ground screw This circuit works well over the kitchen counter top where appliances drawing heavy current are utilized
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Arc fault circuit interrupter devices are required in all branch circuits that supply 125 volt, single-phase, 15 or 20 amp receptacles in bedrooms of homes Lighting outlets and switches must also be protected by arc fault circuit interrupters Under certain circumstances smoke detector circuits are exempt from this requirement
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TEMPORARY WIRING
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emporary wiring is used for power and lighting in the construction of new buildings, houses, sheds, garages, and barns Temporary wiring is also used in several other types of new construction and remodeling projects The requirements for all wiring installations, temporary or permanent, are the same Temporary wiring should be installed so it is not exposed to physical damage Type NM and NMC cable (Romex) can be used in any dwelling, building, or structure without any height limitation Single insulated conductors are permitted where installed for the purpose of lighting (general illumination) and all lamps are protected from accidental contact or breakage by suitable lamp holders and guards and located where only accessible by qualified personel familiar with the construction and operation of the equipment and the hazards involved All branch circuits must be wired from an approved panel board or power outlet All the receptacles have to be of the grounded type All of the receptacles should be connected to the continuous grounding conductor Temporary receptacles wired on construction sites cannot be wired to the branch circuits that supply the power for temporary lighting All 125 volt single-phase 15, 20, and 30 amp receptacles on construction sites shall have ground fault circuit interrupter (GFCI) protection Each temporary circuit installed must have a disconnecting means such as a circuit breaker Disconnects must disconnect all of the ungrounded conductors of each temporary circuit
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On multi-wire temporary branch circuits, such as 12/3 Romex for example, all of the ungrounded circuits must be provided with a means to disconnect them simultaneously Temporary wiring cords and cables should be protected from accidental damage Sharp corners, doorways, and projections must be avoided when the cords and cables pass through the building Other places on the job where they can get pinched or cut need to be protected A good way to protect NM cables in these areas is with short sections of flexible conduit Temporary cables and cords should be run in a manner so they are protected from physical and accidental damage The cables and cords should be supported in place to ensure that they will be protected from damage The supporting means can be staples, cable ties, tape, straps, or similar types of hangers These supports should be used so no damage occurs to the cables that are used for the temporary power and light circuits The temporary power and lighting circuits need to be removed as soon as the permanent wiring has been energized in the areas where the temporary wiring was done Temporary service requirements may vary from state to state and one jurisdiction to another Before starting any work to install a temporary service, the power company must be consulted The local code enforcement officer must also be contacted before any work is started Often a temporary service panel board is mounted on a newly set pole that will be used as part of the permanent power distribution for the building being constructed Other times, a temporary pole must be constructed The most common type of temporary power pole constructed on site is the 6 x 6 inch pole In this application, three 2 x 6 inch planks are spiked together This temporary pole must be set at least 4 feet in the ground It should be braced by 2 x 4 inch braces in three directions, spiked to 2 x 4 inch stakes driven at least 3 feet in the
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