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Could you give me examples of electrical wiring installations?
I am an amateur in electricity and we have to do a research on these. Please help me out!
Describe/give examples/explain the following:
1) Residential Installations
2) Commercial Installations
3) Industrial Installations
Thanks in advance! =]
Answer:
Residential wiring is is usually 240V single-phase, with service between 50 to 200A. Appliances and lighting use either 240V or 120V. Most wiring runs are made without conduit using NM ("Romex") cable. Configuration is fixed at the time of building.
Commercial wiring often uses 480V 3-phase service, chosen for its greater efficiency in running mechanical systems like A/C units, compressors, chillers, fans and so forth. Amperages vary depending on the building size. Lighting can use one "leg" of 120, or a pair of "legs" at 208 or 277 volts. Runs use metallic or PVC conduit with THHN or similar wire. Harsh environments are not the norm, though some wet locations may need special attention to safety grounding and bonding. Wiring configuration is fixed and might only be altered in the course of a remodel.
Industrial or large commercial wiring can use high voltage service (13kV). Some specialty systems with high demand (arc furnaces, for example) may use even higher service voltages. Step-down transformers are provided for the different load types. For example, large motors often use 4140V while lighting can use 208V - each would have its own transformer. Runs use metallic or PVC conduit, or special wiring for moving systems (cranes, robotics, etc.) Some fixtures and connections are designed for the harsh environment, and are also designed for ease of reconfiguration.
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