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Questions and Answers
What is the primary function of a step-down transformer?
What is the primary function of a step-down transformer?
- To distribute power
- To isolate circuits
- To increase voltage
- To decrease voltage (correct)
The National Electrical Code of the Philippines is known as RA. 7920.
The National Electrical Code of the Philippines is known as RA. 7920.
True (A)
Name two types of circuit protective devices.
Name two types of circuit protective devices.
Fuse box, circuit breaker
Which type of cable is designed for underground installation?
Which type of cable is designed for underground installation?
A _____ is used to measure the electricity consumed in kilowatt-hours.
A _____ is used to measure the electricity consumed in kilowatt-hours.
Match the following types of transformers with their descriptions:
Match the following types of transformers with their descriptions:
All convenience outlets are designed to be installed at the same height regardless of the environment.
All convenience outlets are designed to be installed at the same height regardless of the environment.
Name one type of switch that can be used in electrical installations.
Name one type of switch that can be used in electrical installations.
Which of the following materials is a good electrical conductor?
Which of the following materials is a good electrical conductor?
A ground fault interrupter is a type of fuse box.
A ground fault interrupter is a type of fuse box.
The height of a light switch from the center to the finished floor level is _____ mm.
The height of a light switch from the center to the finished floor level is _____ mm.
What is the height requirement for a panel board from center to finished floor level?
What is the height requirement for a panel board from center to finished floor level?
Match the electrical materials with their classifications:
Match the electrical materials with their classifications:
What is the primary function of a junction box?
What is the primary function of a junction box?
A GFCI outlet is used in wet areas to prevent electric shock.
A GFCI outlet is used in wet areas to prevent electric shock.
What is one type of electrical device used for temporary power supply?
What is one type of electrical device used for temporary power supply?
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Study Notes
Electrical Systems
- Comprise laws, codes, standards, services, equipment, and materials.
Laws, Codes, and Standards
- RA 7920 is the National Electrical Code of the Philippines.
- NFPA, particularly Section 230, relates to Fire Protection Standards.
- NESC stands for National Electrical Safety Code, recognized by ANSI.
Electrical Services
- Transformers are essential components with various types:
- Step-up and step-down transformers regulate voltage.
- Isolation transformers provide electrical isolation.
- Auto transformers and three-phase transformers serve specialized functions.
- Distribution and power transformers are used in utility applications.
- Instrument transformers are used for measurement.
Electrical Equipment
- Entrance racks and caps manage electrical feeds.
- Wall-type and post-type racks are common configurations.
- Kilowatt hour meters measure energy consumption.
- Circuit protective devices include:
- Fuse boxes of types: knife blade, cartridge, screw type.
- Circuit breakers of types: plug-in, bolt-on.
- Ground fault interrupters enhance safety.
- Lightning rods and arresters protect systems from surges.
- Service switches control electricity supply.
Electrical Equipment - Motors
- Types of motors include:
- Direct current motors for household appliances.
- Alternating current motors for heavy-duty applications.
- Squirrel-cage induction motors for continuous operations.
Electrical Materials
- Conductors include silver, copper, aluminum, nickel, brass, zinc, platinum, and iron.
- Insulators include rubber, porcelain, oil, varnish, glass, mica, and latex.
- Wires and cables form the backbone of electrical systems, with types such as armored cables, mineral insulated cables, and medium voltage cables.
Electrical Materials - Conduits
- Conduits protect electrical wiring, classified as:
- Rigid metal and flexible metal.
- Rigid non-metal and flexible non-metal.
Electrical Materials - Junctions and Boxes
- Junction boxes and utility boxes facilitate connections and protect wiring.
Electrical Materials - Receptacles
- Types of convenience outlets include single, duplex, triplex, weatherproof, and GFCI.
- Heights for installation are set between 300-400 mm or 1050-1100 mm in industrial areas.
Electrical Materials - Switches
- Varieties of switches include rocker, push, slide, rotary, toggle, and special types like remote-controlled switches.
- Light switches should be installed at a height of 1200 mm from center to finished floor level (FFL).
Electrical Devices
- Key devices include generators, uninterruptible power supplies (UPS), and rechargeable batteries, vital for energy management.
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