30 Questions
What is the main function of the National Transmission Corporation (TRANSCO) created by the Electric Power Industry Reform Act (EPIRA)?
To maintain and manage the entire power transmission system.
Name the two types of electric power distribution systems according to the nature of the supply.
AC Distribution system and DC Distribution system.
What does EPIRA stand for?
Electric Power Industry Reform Act.
What is the purpose of the Electric Power Industry Reform Act (EPIRA) Law?
To privatize the generation, transmission, distribution, and supply of power sector.
What are the three types of electric power distribution systems classified according to the type of connection?
Radial system, Ring system, Interconnected system.
Where does the bulk movement of electrical energy start in the electrical power transmission distribution system?
From a generating site, such as a power station or power plant.
What is the main task of the National Grid Corporation of the Philippines (NGCP) according to the text?
Ensure that the country's transmission assets are in optimal condition to convey safe, quality, and reliable electricity.
Define Transmission lines and Distribution lines based on the text.
Transmission lines carry electricity from power plant to substation, while Distribution lines carry electricity from substations to end-users for residential and commercial use.
What is the purpose of Republic Act (RA) 11361 - “Anti-Obstruction of Power Lines Act”?
To ensure uninterrupted conveyance of electricity and protect the integrity and reliability of the country's transmission, sub-transmission, and distribution system.
What distinguishes Primary Distribution System from Secondary Distribution System in AC distribution?
Primary Distribution operates at higher voltages and handles larger blocks of electrical energy, while Secondary Distribution includes the voltages used by end-users.
How is Primary Distribution typically carried out in an AC distribution system?
Primary distribution is carried out by a 3-phase, 3-wire system.
What types of systems are part of the AC distribution system according to the text?
Overhead system and Underground system are part of the AC distribution system.
What is the main difference between an underground distribution system and an overhead distribution system?
The conductors in the underground system are placed under the surface of streets or sidewalks, while in the overhead system, the conductors are mounted on poles above ground.
According to Republic Act (RA) 7832, what action related to electric transmission lines is considered punishable?
Cutting, sawing, slicing, or removing any electric power transmission line material or meter from a tower, pole, or any other installation.
What part of an electric system is responsible for delivering electric energy to an end-user?
The distribution system.
Name two types of methods used for installing underground distribution systems.
Duct system and Direct burial system.
Why are circuit breakers considered more convenient than fuses?
Circuit breakers are easily reset without needing replacement.
What does the overcurrent rating of an OCP device indicate?
The highest amperage it can carry continuously without exceeding a specific temperature limit.
What is the purpose of an interrupting rating in OCP devices?
To handle the maximum possible fault-current (short-circuit)
Define utilization equipment in the context of electrical systems.
Instruments used by utility companies to measure and record electrical energy consumed.
What is the function of an appliance in an electrical system?
To perform specific tasks like cooking, cleaning, cooling, or heating.
Describe the components of an electrical device panelboard.
Consists of a sheet metal box (cabinet) and a cover to enclose and conceal the interior.
What are some common names used to refer to a panelboard in the electrical trade?
Power panel, load center, distribution center, or main power panel.
What is the purpose of an electric meter in an electrical system?
To measure and record the electrical energy consumed.
What is the unit of measurement for a thousandth of an inch?
Mil
What type of cable is suitable for direct burial in earth as a feeder or branch circuit cable?
Underground feeder (UF) cable
How is Armored Cable classified, and what distinguishes type ACT from type AC?
Armored Cable is classified as either AC or ACT. Type ACT has thermoplastic insulation while type AC has rubber insulation.
What is the difference between Metal-Clad (MC) Cable and Armored Cable (AC) in terms of armor and grounding?
MC cable does not contain a bonding strip like AC cable, and the armor in MC cable cannot be used as an equipment ground.
When is Thermostat Cable typically used, and what is the maximum voltage it can handle?
Thermostat Cable is used in applications with voltage less than 30V, such as doorbells, chimes, and thermostats.
What is the purpose of the sheathing in NMC conductors, and what properties does it provide?
The sheathing in NMC conductors provides flame retardancy, moisture resistance, fungus resistance, and corrosion resistance.
Explore the basics of electrical power transmission and distribution systems, including the movement of energy from power plants to consumers. Learn about key legislation such as Republic Act No. 9136 (EPIRA) which aimed to reform the electric power industry.
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