Electrical Engineering Safety Standards

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Questions and Answers

What is the demand factor for the portion of lighting load from 3001 to 120,000 volt-amperes for dwelling units?

50%

35% (correct)

25%

100%

What is the calculated load for each small appliance branch circuit in a dwelling unit?

1500 volt-amperes (correct)

2000 volt-amperes

1800 volt-amperes

1200 volt-amperes

What percentage of the full-load current rating of the highest motor needs to be added when calculating ampacity for motors and other loads?

125% (correct)

150%

100%

200%

What is the minimum load to be included for each laundry branch circuit installed in a dwelling unit?

1500 volt-amperes Signup and view all the answers

Which of the following statements is true regarding the calculation of motor loads?

Motor loads must consider both the highest motor and other loads. Signup and view all the answers

What is the primary focus of electrical engineering?

Study, design, and application of systems using electricity Signup and view all the answers

Which of the following is NOT a responsibility of electrical engineers?

Designing architectural blueprints Signup and view all the answers

What is required for practicing engineers in electrical engineering as per RA 7920?

Professional certification from PRC Signup and view all the answers

Which of the following tasks does electrical engineering NOT typically involve?

Conducting psychological assessments Signup and view all the answers

Which of the following best describes electricity?

An energy form generated by friction, induction, or chemical change Signup and view all the answers

Which area is NOT typically covered by the practice of electrical engineering?

Installation of sewage systems Signup and view all the answers

What type of engineering knowledge is essential for the sale and distribution of electrical equipment?

Electrical engineering calculations and applications Signup and view all the answers

What are the primary effects of electricity?

Magnetic, chemical, and radiant effects Signup and view all the answers

What is the primary purpose of a plain tap joint in electrical wiring?

To provide a secure joint for high-tensile applications Signup and view all the answers

Which joint is considered the most widely used splice in interior wiring installations?

Western Union Short-tie Splice Signup and view all the answers

What type of joint is best suited for connecting a small-diameter wire to a larger diameter wire in a lighting fixture?

Fixture Joint Signup and view all the answers

What is the purpose of the Western Union Long Tie splice?

To extend wire lengths for outside wiring applications Signup and view all the answers

Which joint can be used when the heavy tap wire cannot easily wrap around the main wire?

Wrapped Tap Joint Signup and view all the answers

What kind of splice is the split bolt splice primarily used for?

Joining large conductors Signup and view all the answers

Which connector is used to replace the rattail joint splice?

Wire Nut Signup and view all the answers

What do service conductors do in an electrical wiring system?

Connect wiring systems to the local utility Signup and view all the answers

How is the labor cost for electrical plan design estimated?

It is calculated as 20 to 30% of total material costs. Signup and view all the answers

What determines the quantity of conduits needed for an electrical plan?

Total computed length of wire divided by 3. Signup and view all the answers

What is the total length of ungrounded wires based on the provided formula?

Total length of wire multiplied by 2. Signup and view all the answers

How are the quantities of utility boxes determined in an electrical plan?

Equal to the total number of visible switches and convenience outlets. Signup and view all the answers

What is the quantity of adapters in relation to locknuts and bushings?

Equal to the number of locknuts and bushings. Signup and view all the answers

What is the minimum size of equipment grounding conductor for a circuit with a 20 ampere overcurrent protection?

3.5 mm2 Signup and view all the answers

For a grounding electrode conductor size, what is the correct size for a service entrance conductor that is 60 mm2?

22 mm2 Signup and view all the answers

When calculating the size of service entrance conductors, what additional percentage is added for the largest motor's full load amperage?

25% Signup and view all the answers

What is the minimum size grounding conductor required for a service entrance conductor greater than 175 mm2 but not exceeding 325 mm2?

60 mm2 Signup and view all the answers

What is the total size of service equipment required for a circuit with a 40 ampere motor protective device and two additional branch circuits rated at 15 amps each?

70 amperes Signup and view all the answers

Which of the following sizes is NOT a minimum size for equipment grounding conductors based on the settings of overcurrent devices?

10 mm2 for 40 A Signup and view all the answers

What is the minimum grounding electrode conductor size for a service entrance conductor that is rated at 38 mm2?

14 mm2 Signup and view all the answers

If there is a continuous load of 10 amperes in addition to the largest motor FLA of 20 amperes, how should you calculate the size of the service entrance conductors?

Sum of 10 A, 20 A, and 25% of 20 A Signup and view all the answers

Study Notes

Electrical Engineering Overview

Discipline focused on electricity, electronics, and magnetism.
Involves study, design, and application of electric systems and devices.
Promotes electrical safety and the optimization of technology.

Professional Requirements

Practicing electrical engineers must hold a degree in electrical engineering.
Certification from Professional Regulation Commission (PRC) is mandatory.
Membership in the Institute or Integrated Electrical Engineers is required by RA 7920.

Areas of Practice in Electrical Engineering

Consultancy: Offering expert advice and investigation.
Design: Preparing plans and specifications for electrical systems.
Construction: Overseeing the installation and commissioning of electrical power systems.
Management: Supervising operations and maintenance of equipment.
Manufacturing: Engaging in production and repair of electrical devices.
Education: Teaching electrical engineering concepts and practices.
Sales: Managing the distribution of electrical equipment and systems.

Introduction to Electricity

Electricity is energy generated through friction, induction, or chemical change.
It has magnetic, chemical, and radiant effects.

Electrical Wiring Splices and Joints

Plain Tap Joint: Used for tap wires under tension.
Aerial Tap: Temporary tap used at construction sites.
Duplex Cross Joint: Joins two tap wires simultaneously for heavy stress.
Western Union Splices: Widely used for extending wire lengths in both interior and exterior applications.
Fixture Joint: Connects smaller wires to larger circuits.
Knotted Tap Joint: Simplistic tap with limited strain resistance.

Electrical House Wiring Systems

Service: Conductors delivering electric energy from utility to premises.
Service Conductor: Links service point to disconnecting means, not counted for branch circuits for illumination.

Load Calculations

Small Appliance Circuit Load: Calculated at 1500 volt-amperes for each circuit in a dwelling unit.
Load Factors: Vary based on occupancy type and total demand.

Motor Loads and Grounding

Motor loads calculated at 125% of the highest full-load current plus others in the circuit.
Ampacity requires various minimum sizes for equipment grounding conductors based on overcurrent device ratings.

Comprehensive Designing Measures

Service Entrance Conductors: Sized by summing computed load, largest motor FLA, and 25% of continuous load.
Electrical Plan Estimates: Include calculations for materials and labor costs associated with the installation.

Computation for Estimates

Labor is typically estimated at 20-30% of total material costs.
The quantity of conduits and wires is derived from overall lengths needed for the project.
Estimations for junction boxes, circuit breakers, and other components are calculated based on site-specific requirements.

Wiring and Conductor Guidelines

Ground wire is green/white.
Conductors must be sized correctly to ensure safety and efficiency.

These notes summarize the key aspects of electrical engineering as required for operation and maintenance safety standards, highlighting both theoretical knowledge and practical applications.

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Description

This quiz focuses on the operation and maintenance safety standards in electrical engineering. It covers essential practices that ensure the safe design and application of electrical systems and technologies. Participants will learn about safety protocols and optimization techniques relevant to the field.