p.22
Electrical Design Principles
What is a special outlet?
An outlet intended for specific equipment that uses a large amount of electricity, such as air conditioning units and refrigerators.
p.23
Electrical Design Principles
What is the purpose of a pull box?
To facilitate pulling in the conductors and may also serve to distribute the conductors.
p.40
Designing Electrical Plans for Residential Buildings
Why are riser diagrams important in building design?
They help in understanding the vertical integration of systems and facilitate planning and installation.
p.16
Electrical Properties of Materials
What is ampacity?
The current in amperes that a conductor can carry continuously without exceeding its temperature rating.
What advantage does the Aerial Tap provide?
The easy twist facilitates tap wire movement.
What is the purpose of the Western Union Long-tie Splice?
To extend the length of wire for outside wiring.
p.55
Designing Electrical Plans for Residential Buildings
What is the purpose of a load schedule in electrical design?
To list all electrical loads and their specifications for proper distribution.
p.13
Electrical Design Principles
What are the three types of conductors used in electrical systems?
Bare, Covered, and Insulated.
How can conduits be classified?
As rigid metal, flexible metal, rigid non-metal, and flexible non-metal.
p.31
Electrical Design Principles
What is the purpose of an appliance branch circuit?
To supply outlets intended for feeding appliances.
p.33
Electrical Design Principles
What must overcurrent protective devices protect?
The wiring, transformer, lights, appliances, and other equipment.
p.16
Electrical Properties of Materials
What does ampacity depend on?
The conditions of use and the conductor's temperature rating.
p.46
Designing Electrical Plans for Residential Buildings
Can special outlets be connected to convenience outlets?
No, they must not be connected.
p.13
Electrical Design Principles
What is an insulator?
Material used to resist the flow of current.
p.50
Designing Electrical Plans for Residential Buildings
What is the primary focus of designing an electrical plan?
To outline the electrical layout and specifications for a building.
p.31
Electrical Design Principles
What is an individual branch circuit designed for?
To supply a single specific item.
p.31
Electrical Design Principles
What is a good practice regarding lighting and receptacles in a circuit?
Lighting and receptacles should not be combined in a single circuit.
p.31
Electrical Design Principles
What should be avoided when connecting building lights?
Connecting all building lights on a single circuit.
What is a Duplex Cross Joint?
It is a two-tap wire joint turned simultaneously, used under heavy tensile stress.
p.32
Electrical Design Principles
What do overcurrent protective devices do?
They open the circuit or disconnect the line when the current rating capacity is exceeded.
p.13
Electrical Design Principles
What is a conductor?
Materials used to flow current.
p.21
Electrical Design Principles
What are the different kinds of outlets?
1. Convenience outlet 2. Lighting outlet 3. Special outlet.
p.31
Electrical Design Principles
What do general purpose branch circuits supply?
Outlets for lighting and appliances, including convenience receptacles.
p.34
Electrical Measuring Instruments
What is a fuse?
An overall current protective device with a circuit opening fusible element that opens when there is an overcurrent in the circuit.
p.45
Designing Electrical Plans for Residential Buildings
What role do circuit breakers play in an electrical plan?
They protect the electrical system from overloads and short circuits.
p.39
Designing Electrical Plans for Residential Buildings
What are the main components of an Electrical Plan for a residential building?
1. Power or outlet layout 2. Lighting layout 3. Riser Diagram 4. Load Schedule.
What is the most widely used splice in interior wiring installation?
Western Union Short-tie Splice.
p.22
Electrical Design Principles
What are some examples of electrical accessories?
Junction Box, Receptacles, Pull Box, Switches.
p.51
Designing Electrical Plans for Residential Buildings
How should the connections of lighting and outlets be indicated?
By indicating the number or branch circuit.
p.13
Electrical Design Principles
Name three examples of good conductors.
Silver, Copper, and Aluminium.
p.41
Electrical Properties of Materials
What is the role of a circuit breaker?
To protect electrical circuits from overload or short circuits.
p.41
Electrical Measuring Instruments
What does an electrical meter measure?
The amount of electrical energy consumed.
p.17
Electrical Properties of Materials
What are the temperature ratings listed for conductors in the ampacity table?
60°C (140°F), 75°C (167°F), and 90°C (194°F).
p.34
Electrical Measuring Instruments
What is the characteristic of a cartridge type fuse?
It is enclosed in an insulating fiber tube.
p.34
Electrical Measuring Instruments
What is the characteristic of a plug fuse type?
It is enclosed in a porcelain cap.
p.37
Electrical Design Principles
What are the two types of Service Entrance?
Overhead service and underground service.
p.46
Designing Electrical Plans for Residential Buildings
How should the connections of lighting and outlets be indicated?
By indicating the number of branch circuits.
p.55
Designing Electrical Plans for Residential Buildings
What is a riser diagram?
A graphical representation of the vertical distribution of electrical systems in a building.
p.32
Electrical Design Principles
What becomes the source of voltage when looking upstream from the overcurrent devices?
The busbars in the panel board.
p.24
Electrical Design Principles
What is the primary function of a switch in an electric circuit?
To open or close the circuitry.
p.52
Designing Electrical Plans for Residential Buildings
How does a Power Layout Plan assist in construction?
It provides guidelines for electrical installation and helps avoid potential issues.
p.33
Electrical Properties of Materials
What are the two main causes of overcurrent?
Overload in the equipment or conductors and short circuit or ground fault.
What are butted splices?
Splices made by joining the free ends of conductors together.
p.47
Designing Electrical Plans for Residential Buildings
What key elements are typically included in a Power Layout Plan?
Electrical outlets, switches, lighting fixtures, and circuit breakers.
What is a wire?
An electrical conductor that is smaller in size.
p.46
Designing Electrical Plans for Residential Buildings
What should be plotted separately in the floor plan?
Lighting and convenience outlets.
When is a Wrapped tap or Tee joint used?
On large solid conductors where wrapping the heavy tap wire is difficult.
p.52
Designing Electrical Plans for Residential Buildings
What key elements are included in a Power Layout Plan?
Electrical outlets, switches, lighting fixtures, and circuit breakers.
p.21
Electrical Design Principles
What is a convenience outlet?
A device that connects a flexible cord conductor to the conductors of the receptacle.
p.49
Electrical Design Principles
How does a riser diagram assist in electrical planning?
It helps visualize the layout and ensure proper load distribution throughout the building.
p.35
Electrical Design Principles
What is a Circuit Breaker?
An overcurrent protective device designed to function as a switch.
What is the purpose of an Aerial Tap?
It is used as a temporary tap, usually done at construction sites.
p.23
Electrical Design Principles
What is a receptacle?
A contact device installed in an outlet for the connection of an attachment plug.
p.45
Designing Electrical Plans for Residential Buildings
What should be considered when designing an electrical plan?
Load calculations, circuit layouts, and safety regulations.
p.22
Electrical Design Principles
What is the purpose of a junction box?
To join different runs of raceway or cable, providing space for connection and branching of enclosed conductors.
p.55
Designing Electrical Plans for Residential Buildings
What should be included in a riser diagram?
Details such as circuit paths, load connections, and equipment locations.
p.47
Designing Electrical Plans for Residential Buildings
What is the purpose of a Power Layout Plan?
To organize and plan the distribution of electrical power throughout a building.
p.13
Electrical Design Principles
What is the purpose of designing an electrical plan?
To familiarize students with electrical building wiring and compute an electrical plan.
What is a Plain Tap Joint used for?
It is used where the tap wire is under considerable tensile stress.
What is splicing in electrical wiring?
The process of combining two lengths of wires so they can carry a current.
p.21
Electrical Design Principles
What is an outlet in a wiring system?
A point where current is taken to supply utilization equipment.
p.49
Electrical Design Principles
What is the purpose of a load schedule in electrical design?
To list all electrical loads and their specifications for proper distribution.
p.45
Designing Electrical Plans for Residential Buildings
What is a key component of an electrical plan?
The placement of outlets and switches.
p.13
Electrical Design Principles
Name three examples of insulators.
Rubber, Porcelain, and Glass.
What is another function of conduits regarding safety?
To protect the wiring system from damage by the building and occupants.
How do conduits protect the building and occupants?
By protecting them from damage caused by the electrical system.
p.40
Designing Electrical Plans for Residential Buildings
What is a riser diagram?
A schematic representation of the vertical distribution of electrical or plumbing systems in a building.
p.40
Designing Electrical Plans for Residential Buildings
What does a sample riser diagram typically illustrate?
The layout and connections of systems such as electrical, plumbing, or HVAC.
p.55
Designing Electrical Plans for Residential Buildings
How does a riser diagram relate to a load schedule?
It visually represents the information provided in the load schedule for vertical systems.
p.47
Designing Electrical Plans for Residential Buildings
What is a Power Layout Plan?
A schematic representation of electrical systems and components in a building.
p.41
Electrical Design Principles
What is the function of a panel board?
To distribute electrical power to various circuits.
How do conduits protect wires?
By physically protecting them and providing a grounded enclosure.
p.29
Electrical Design Principles
What is included in a Branch Circuit?
Source voltage, wiring, and load.
p.32
Electrical Design Principles
What is the primary purpose of protecting a branch circuit?
To protect it from overcurrent.
p.37
Electrical Design Principles
What does underground service consist of?
A raceway extending from the building to the property line where it is tapped to the main.
What is a Rat Tail or Pig Tail splice used for?
To join two or more conductors inside a junction box without mechanical stress.
p.41
Electrical Design Principles
What does a lighting legend indicate?
The types and locations of lighting fixtures in a design.
p.21
Electrical Design Principles
What is a lighting outlet?
An outlet intended for direct connection to a lamp holder or lighting fixture.
p.29
Electrical Design Principles
What does a Branch Circuit refer to?
The complete path traversed by an electric current.
p.50
Designing Electrical Plans for Residential Buildings
What is an essential component of an electrical plan?
The placement of outlets, switches, and fixtures.
p.50
Designing Electrical Plans for Residential Buildings
Why is it important to follow local codes in electrical design?
To ensure safety and compliance with regulations.
p.17
Electrical Properties of Materials
What types of conductors are mentioned in the ampacity table?
TW, UF, RHW, THHW, THW, THWN, XHHW, USE, ZW, TBS, SA, SIS, FEP, FEPB, MI, RHH.
p.30
Electrical Design Principles
What does flexibility of the circuit refer to?
The installation can accommodate all probable pattern arrangements and locations of loads for expansion or future development.
p.30
Electrical Design Principles
What are the two factors that affect the reliability of electric power?
The electric utility and the building electric system.
p.32
Electrical Design Principles
What type of device should be installed in all branch circuitries?
An overall current protective device.
p.52
Designing Electrical Plans for Residential Buildings
What is the purpose of a Power Layout Plan?
To ensure proper distribution of electrical power throughout a building.
p.22
Electrical Design Principles
What does a junction box typically have?
A blank cover and sufficient space for connections.
p.34
Electrical Measuring Instruments
What happens to a fuse during an overcurrent?
It opens (breaks) to protect the circuit.
What is a tap joint in electrical wiring?
A junction that joins a branch conductor to a continuous main wire.
p.39
Designing Electrical Plans for Residential Buildings
What does the Power or outlet layout in an Electrical Plan indicate?
The placement of electrical outlets and power sources.
p.24
Electrical Design Principles
What are 3-way switches used for?
To control lights with two switches.
p.31
Electrical Design Principles
What should not be allowed in combination with switch and receptacle outlets?
Combination switch and receptacle outlets.
p.48
Electrical Design Principles
What rule should be followed when selecting wire size?
Always choose the next size up rule.
p.17
Electrical Properties of Materials
How does the ampacity of copper compare to aluminum conductors?
Copper conductors generally have higher ampacity than aluminum conductors of the same size.
What is a stranded wire?
Multiple wires twisted together to form a metallic string.
p.45
Designing Electrical Plans for Residential Buildings
What is the primary focus of designing an electrical plan?
To ensure safe and efficient electrical distribution in a building.
What is a raceway?
An enclosed channel of metal or non-metallic materials designed for holding wires, cables, or busbars.
When is a Y-Splice typically used?
On small cables where the strands are flexible and can be wrapped in one operation.
p.49
Electrical Design Principles
What should be included in a riser diagram?
Information about circuits, load connections, and vertical pathways for electrical systems.
p.51
Designing Electrical Plans for Residential Buildings
How are special outlets counted in the circuit layout?
As one branch circuit and must not be connected to convenience outlets.
p.34
Electrical Measuring Instruments
Is a fuse a one-time or reusable device?
It is a one-time protective device that must be replaced after a fault is cleared.
What is a cable?
An electrical conductor that is larger in size.
p.52
Designing Electrical Plans for Residential Buildings
What is a Power Layout Plan?
A schematic representation of electrical systems and their components in a building.
p.49
Electrical Design Principles
What is a riser diagram?
A graphical representation of the vertical distribution of electrical systems in a building.
p.51
Designing Electrical Plans for Residential Buildings
What should be plotted separately in the floor plan?
Lighting and convenience outlets.
What are common types of raceways for household wiring installations?
Conduits, connectors, and other accessories.
p.23
Electrical Design Principles
In what context is a pull box used?
In one or more runs or raceway.
What is one purpose of electrical conduits?
To provide a means for running wire from one point to another.
p.50
Designing Electrical Plans for Residential Buildings
What should be considered when designing an electrical plan?
Load calculations, circuit layouts, and safety regulations.
p.17
Electrical Properties of Materials
What is the purpose of the ampacity table in the Philippine Electrical Code 2017?
To provide the current-carrying capacity of different conductor sizes at various temperature ratings.
p.29
Electrical Design Principles
What are some considerations in good circuitry design?
Flexibility, reliability, safety, economy, energy consideration, and space allocation.
p.38
Electrical Properties of Materials
Name another method of grounding.
Connecting to a ground rod.
How does a Cross Joint differ from a plain tap?
It is a combination of two plain taps placed side by side.
p.41
Electrical Design Principles
What is the purpose of legends in electrical design?
To provide a clear understanding of symbols and components used in electrical plans.
p.45
Designing Electrical Plans for Residential Buildings
Why is it important to follow local codes in electrical design?
To ensure safety and compliance with legal standards.
What is a special outlet used for?
To accommodate specific electrical devices or requirements.
p.24
Electrical Design Principles
What are the classifications of switches mentioned?
1. General use switch 2. General use snap switch 3. AC general use snap switch 4. AC-DC general use switch 5. Isolating switch 6. Motor circuit switch.
p.51
Designing Electrical Plans for Residential Buildings
What is the purpose of the lighting layout plan?
To plot the lighting connections in the floor plan.
What type of insulation does THW provide?
Moisture and Heat Resistant Thermoplastic.
What type of insulation is used for XHHW conductors?
Cross Linked Thermosetting.
p.30
Electrical Design Principles
What does economy in electrical design refer to?
The initial cost as well as the operating cost.
p.36
Electrical Design Principles
How many poles can a circuit breaker have?
A circuit breaker can have 1, 2, or 3 poles.
p.24
Electrical Design Principles
What is a general use switch intended for?
For use in the general distribution and branch circuit rated in amperes.
p.24
Electrical Design Principles
Where is a general use snap switch typically installed?
In flush device boxes or an outlet box cover.
p.24
Electrical Design Principles
What is the purpose of an isolating switch?
To isolate an electric circuit from the source of power.
p.39
Designing Electrical Plans for Residential Buildings
What is the purpose of the Lighting layout in an Electrical Plan?
To show the arrangement and types of lighting fixtures.
p.35
Electrical Design Principles
What is Ampere Trip (AT)?
The maximum current that a circuit breaker will trip the circuit, normally 60% to 100% of ampere frame.
p.33
Electrical Design Principles
When can conductor size be reduced in a circuit or tap?
Unless the smallest wire is protected by the circuit overcurrent devices.
p.29
Electrical Design Principles
What is the importance of safety in circuitry design?
To prevent hazards and ensure user protection.
p.53
Electrical Design Principles
How do you calculate the ampere value of each branch circuit?
Divide each branch's Volt Ampere by 230 Volts.
p.53
Electrical Design Principles
What should be done to determine the total ampere of the design?
Add all branch circuits' Volt Ampere values and divide by 230 volts.
p.35
Electrical Design Principles
What is the purpose of the automatic tripping device in a Circuit Breaker?
To protect the branch circuit from overload and ground fault.
p.35
Electrical Design Principles
Can a Circuit Breaker be manually tripped?
Yes, it can be manually tripped and also acts as a circuit switch.
p.31
Electrical Design Principles
How should lighting and receptacles be supplied with current?
From at least two circuits to prevent total power loss if one line is out.
p.48
Electrical Design Principles
How do you calculate the ampere value of each branch circuit?
Divide each branch's Volt Ampere by 230 Volts.
p.38
Electrical Design Principles
Where is the Electric Service Meter typically installed?
Outside the building at the property line wall or electric post.
p.30
Electrical Design Principles
What does safety of the circuitry imply?
Independent service can be used as backup for normal services instead of emergency equipment.
p.48
Electrical Design Principles
What is the final size of wire recommended for the load?
2 - 14 sq.mm THHN Cu wire + 1 - 8.0 sq.mm TW ground in 25 mm RSC.
p.33
Electrical Design Principles
Where should overcurrent protection devices be installed?
On the line or supply side of the equipment being protected.
p.33
Electrical Design Principles
What is required for underground conductors in protected circuits?
Overcurrent protective devices must be placed in all underground conductors.
p.33
Electrical Design Principles
How should all equipment be protected?
In accordance with its current carrying capacity.
p.29
Electrical Design Principles
Why is flexibility important in circuit design?
To accommodate changes and future needs.
p.29
Electrical Design Principles
What does reliability and efficiency of service refer to in circuit design?
The consistent performance and effectiveness of the circuit.
p.43
Electrical Measuring Instruments
Which conductor type has the highest ampacity rating at 90°C?
Types TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW - 2, THHN, THHW, THW - 2, THWN - 2, USE - 2, XHH, XHHW, XHHW - 2, ZW - 2.
p.54
Electrical Design Principles
What type of circuit breaker protection is suggested?
125 AT/200AF, 2P, Bolt-On Type CB.
p.54
Electrical Design Principles
What is the formula used to calculate the IFL?
IFL = 123.74 + 0.25 * 12 or IFL = 123.74 + 1.5 * 12.
p.36
Electrical Design Principles
How can the position of a circuit breaker be detected?
The position can be easily detected at the handle, indicating if it is closed, tripped, or open.
p.39
Designing Electrical Plans for Residential Buildings
What does a Riser Diagram represent in an Electrical Plan?
The vertical distribution of electrical systems within a building.
p.35
Electrical Design Principles
What is Ampere Frame (AT)?
The maximum current that a circuit breaker can withstand for a long period of time.
p.38
Electrical Properties of Materials
What is the purpose of grounding in an electrical system?
To fix permanently a zero-voltage point in the system.
p.17
Electrical Properties of Materials
What is the significance of the diameter in the ampacity table?
It indicates the physical size of the conductor, which affects its current-carrying capacity.
p.48
Electrical Design Principles
What type of circuit breaker is recommended?
60 AT/100AF, 2P, Bolt-On Type CB.
p.42
Designing Electrical Plans for Residential Buildings
What should be done to determine the total ampere of the design?
Add all the branch circuits' Volt Ampere values and divide by 230 volts.
p.47
Designing Electrical Plans for Residential Buildings
How does a Power Layout Plan assist in construction?
It provides a clear guide for electricians and contractors during installation.
p.35
Electrical Design Principles
What does 'Trip' or 'Tripping' refer to in the context of Circuit Breakers?
The cutting-off or disconnection of the current supply.
p.33
Electrical Design Principles
What should be done to protect overcurrent protective devices?
They should be readily assembled and protected from physical damage and away from easily ignited materials.
p.42
Designing Electrical Plans for Residential Buildings
How should lighting and outlets be plotted in the electrical plan?
They must be plotted in separate sheets.
p.30
Electrical Design Principles
What factors must be considered for space allocation in electrical design?
Easy maintenance, ventilation, expandability, centrality, and limited access.
p.36
Electrical Design Principles
What is a limitation of a fuse compared to a circuit breaker?
A fuse is a single pole device that can only protect one electric line.
p.34
Electrical Measuring Instruments
What are the two types of fuses?
Cartridge type and plug fuse type.
p.39
Designing Electrical Plans for Residential Buildings
What is included in a Load Schedule of an Electrical Plan?
The expected electrical load for different circuits.
p.35
Electrical Design Principles
According to the Philippine Electrical Code (PEC), what are some common sizes for Circuit Breaker AT?
15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000, 6000.
p.29
Electrical Design Principles
How does economy relate to circuit design?
It refers to minimizing costs while maintaining quality.
p.38
Electrical Properties of Materials
What is one method of accomplishing grounding?
Connecting to a buried cold water main.
p.42
Designing Electrical Plans for Residential Buildings
How is the circuit breaker size determined?
It may equal the ampacity of the wire or the next size lower.
p.36
Electrical Design Principles
What maintenance requirement does a circuit breaker have that a fuse does not?
Circuit breakers have several moving parts that require maintenance and periodic testing.
p.34
Electrical Measuring Instruments
What does a fuse consist of?
A fusible link or wire that easily melts at low temperature.
p.24
Electrical Design Principles
How do 3-way switches differ from single pole switches?
They do not have an on/off position.
p.48
Electrical Design Principles
How is the circuit breaker size determined?
It may equal the wire ampacity or the next size lower.
p.29
Electrical Design Principles
What does energy consideration mean in circuit design?
Efficient use of energy resources.
p.36
Electrical Design Principles
How does a circuit breaker respond to an overcurrent compared to a fuse?
A circuit breaker trips off automatically and can be reset, while a fuse must be discarded after it blows.
p.43
Electrical Measuring Instruments
What type of conductors have a temperature rating of 75°C?
Types RHW, THHW, THW, THWN, XHHW, USE, ZW.
p.30
Electrical Design Principles
What is a key consideration in energy management?
Energy laws, budget, energy conservation techniques, and energy control.
p.36
Electrical Design Principles
How does the cost of a fuse compare to that of a circuit breaker?
The cost of a fuse is much lower compared to that of a circuit breaker.
What type of insulation is used for thermoplastic conductors?
Moisture Resistant Thermoplastic.
p.38
Electrical Properties of Materials
Why should the grounding connection not be broken or fused?
To maintain a solid and uninterrupted connection to the ground.
What size of wire is recommended for the circuit?
2 - 50 sq.mm THHN Cu wire + 1 - 14 sq.mm TW ground.
p.42
Designing Electrical Plans for Residential Buildings
What is the purpose of the Load Schedule in electrical design?
To identify the sizes of wire and circuit breakers needed.
p.36
Electrical Design Principles
What is one advantage of a circuit breaker over a fuse?
The circuit breaker acts as a switch in addition to being an overcurrent protective device.
p.42
Designing Electrical Plans for Residential Buildings
What rule should be followed when selecting wire sizes?
Always choose the next size up rule.
p.42
Designing Electrical Plans for Residential Buildings
What is the first step in designing an electrical plan?
Plot the lightings, convenience outlets, special outlets, and panel board in the floor plan.
p.29
Electrical Design Principles
Why is space allocation important in circuit design?
To ensure proper installation and maintenance.
p.53
Electrical Design Principles
What multipliers are used for the largest motor load in wire size and protection?
Multiply by 0.25 for wire size and 1.5 for protection.
p.36
Electrical Design Principles
What is a disadvantage of a fuse compared to a circuit breaker?
A fuse is less reliable in terms of detection since the melted element is inside the casing.
What rule should be followed when selecting wire size?
Always choose the next size up rule.
p.38
Electrical Properties of Materials
What is a third method of grounding?
Connecting to a buried ground plate.
p.53
Electrical Design Principles
How is the circuit breaker size determined?
It may equal the wire ampacity or the next size lower.
p.42
Designing Electrical Plans for Residential Buildings
How do you calculate the ampere value of each branch circuit?
Divide the Volt Ampere of each branch by 230 Volts.
p.36
Electrical Design Principles
What is one major advantage of a fuse?
Fuses are more reliable and stable, often lasting for years without needing replacement.
p.30
Electrical Design Principles
What are the classifications of branch circuits?
General purpose branch circuit, appliance branch circuit, and individual branch circuit.
p.42
Designing Electrical Plans for Residential Buildings
What is the final step in the electrical design process?
Using the load schedule to draw the riser diagram.
