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The lower the gauge, the larger the wire, and the more current it can handle. Wires running inside NM cable, Bx cable, or conduit are sized according to each circuit's amperage. It is used in garages, sheds, and outdoor applications where the wiring must be protected from exposure.
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The Standard is organized around 1910.305(a), Wiring methods, 1910. It is commonly used where wiring for appliances, such as dishwashers and garbage disposals, is exposed.Ĭonduit is a rigid metal or plastic tubing that protects individual insulated wires. OSHA Standard 1910.305, Wiring methods, components, and equipment for general use, addresses wiring methods, components, and equipment for general use as one of several parts of 1910 Subpart S, Electrical. It is suitable for use in dry, protected areas (inside stud walls, on the sides of joists, etc.) that are not subject to mechanical damage or excessive heat.īx cable, also known as armored cable, consists of wires running inside a flexible aluminum or steel sheath that is somewhat resistant to damage. You’ll be able to cut through the confusion, get exactly what you need and ensure that your wiring is safe.
Electrical wiring for dummies pdf how to#
We’ll teach you how to identify different electrical cable types and their uses, and how to determine the size of individual wires and their purposes. NM cable is the most common type of circuit wiring. The wire and cable aisle at your home center can be a pretty confusing place. Your home’s wiring consists of a few different types of wiring, including non-metallic cable (commonly called Romex), Bx cable, and wiring concealed in conduit. Power is always present in the utility service lines and the electric meter unless it is shut off by the utility. However, power is always flowing into the panel and to the service lugs even when the main breaker is shut off unless the power is shut off at a separate disconnect switch. Turning off the main breaker stops the flow of power to all of the branch circuit breakers in the panel, and therefore to all of the circuits in the house.
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In systems without an external disconnect switch, the main breaker serves as the household disconnect. In a tripped state, no current will flow to the panel. Older panels were sized for 150, 100, or fewer amps (amperes).Ī main breaker of 200 amps will allow a maximum of 200 amps to flow through it without tripping. A standard panel today provides 200-amp (ampere) service. It is sized according to your home's service capacity. The service panel contains a large main breaker that is the switch controlling the power to the rest of the circuit breakers inside the panel. The Spruce Home Improvement Review Board.