Safety Regulations for Electrical Work

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Questions and Answers

What is the minimum safe distance a worker should maintain from overhead power lines?

5 ft

20 ft

15 ft

10 ft (correct)

Which type of ladders can be safely used near overhead power lines?

Plastic ladders

Metal ladders

Wood or fiberglass ladders (correct)

Aluminum ladders

What is the purpose of a power line proximity warning device?

To lower the boom rapidly

To insulate the boom from electrical power

To increase the voltage of the power line

To notify the operator if the boom is too close to a power line (correct)

What happens as the length of a wire of a given cross-section increases?

Resistance increases Signup and view all the answers

What characteristic defines intrinsically safe electrical equipment?

It has limited energy to prevent ignition Signup and view all the answers

What should be done when electrical equipment is located in a 'people' zone?

Protect with shields, conduit, and barriers Signup and view all the answers

What is a common limitation of wire size in electrical applications?

Each gauge has a recommended maximum length to ensure safety Signup and view all the answers

What is the flash point range for combustible liquids?

Between 100°F and 200°F Signup and view all the answers

Which class of materials has a flash point less than 100°F?

Flammable liquids Signup and view all the answers

What defines a pyrophoric liquid?

Ignites spontaneously at or below 130°F Signup and view all the answers

Which of the following substances is classified as an oxidizer?

Inorganic peroxide Signup and view all the answers

What is the definition of a poison A?

Extremely dangerous poisonous gases or liquids Signup and view all the answers

What is the primary purpose of emergency actions in an incident?

To mitigate the severity of an incident Signup and view all the answers

What defines an atmospheric tank?

A storage tank operating at atmospheric pressure to 0.5 psig Signup and view all the answers

Which of the following best describes a catastrophic release?

An uncontrolled emission involving a highly hazardous chemical Signup and view all the answers

What is meant by 'replacement in kind'?

A replacement that satisfies the design specification Signup and view all the answers

Which characteristic does a highly hazardous chemical NOT possess?

Non-reactive properties Signup and view all the answers

Which of the following teams may be required during emergency actions?

Fire brigades Signup and view all the answers

What does 'normally unoccupied remote facility' refer to?

A facility with no employees permanently stationed Signup and view all the answers

What is a trade secret?

A confidential formula or information used for competitive advantage Signup and view all the answers

What is the purpose of using personal protective equipment (PPE)?

To ensure safety during hazardous activities Signup and view all the answers

What actions can emergency actions include?

Treatment and recovery operations Signup and view all the answers

What is the maximum distance for grounding protection over 500V?

35 Signup and view all the answers

Which of the following is a common effect of electrical hazards?

Respiratory arrest Signup and view all the answers

What voltage is considered low-voltage equipment?

24V Signup and view all the answers

What property of a material is capacitance measured in?

Farads Signup and view all the answers

How much energy in joules does a spark from static electricity release when a person walks on carpet?

0.125 J Signup and view all the answers

What is a primary function of Smart Power Integrated Circuits (PIC)?

To prevent unauthorized current flow Signup and view all the answers

Which of the following can produce static electricity?

Walking on dry carpet Signup and view all the answers

What is the approximate capacitance for a person in farads?

100 pF Signup and view all the answers

What minimizes the buildup of static charge in an environment?

Increasing humidity Signup and view all the answers

What is the primary cause of fatigue failure in materials?

Repeated stress cycles leading to cracks Signup and view all the answers

Which factor contributes to creep in materials?

Slow loading over time Signup and view all the answers

What is the role of moisture in the corrosion of buried LPG pipework?

It creates an electro-chemical reaction with soil contaminants. Signup and view all the answers

What is tuberculation in the context of pipeline corrosion?

The buildup inside a pipeline caused by bacterial reactions with iron. Signup and view all the answers

Which method is NOT effective for protecting against corrosion?

Exposing the pipe to environmental elements Signup and view all the answers

What are corrosion cells primarily concerned with?

Electronic transfer between anodes and cathodes. Signup and view all the answers

What is the consequence of poor or faulty workmanship in structural design?

Improper assembly leading to potential failure Signup and view all the answers

What causes the area of high stress concentration in materials?

Existence of corners, threads, and holes. Signup and view all the answers

What is a potential result of inadequate support in a structure?

Structural failure due to insufficient load capacity Signup and view all the answers

What is the impact of cyclical loading on material fatigue?

It causes gradual accumulation of material stress. Signup and view all the answers

Study Notes

Electrical Basics

Voltage is the difference in charge between two points
Current is the rate at which charge flows
Resistance is a material's tendency to resist current flow

Ohm's Law

V = I x R, where V is voltage (volts), I is current (amperes), and R is resistance (ohms)
1 Ampere = 1 Coulomb

Series Circuits

Components are connected along a single path.
The same current flows through all components

Parallel Circuits

Electrical current to each element is separate.
If one element fails, others still function.

Direct Current (DC)

Unidirectional flow of electric charge
Current flows in the same direction constantly

Alternating Current (AC)

Electric charge periodically reverses direction.
Current values periodically change between positive and negative values.

Resistance in a Series Circuit

Rseries = R1 + R2 + ... + Rn

Resistance in a Parallel Circuit

1/Rt = 1/R1 + 1/R2 + ... + 1/Rn

Voltage in AC Circuits

V = √(P/cosФ) where V is voltage, P is true power, and Ф is the phase angle in degrees.

Power in DC Circuits

P = VI
P =I²R
P = V²/R where P is power (watts), V is voltage (volts), and I is current (amperes), and R is resistance (ohms)

Power in AC Circuits

P = V I cosФ.

Joule's Law

P = I²R = IV = V²/R
where 'P' is electrical power (watts), 'I' is current (amperes), 'V' is voltage (volts), and 'R' is resistance (Ω)

Capacitors/condensers

Passive components with two conductors separated by a dielectric.
Store energy in the electric field.
Measured in farads (F).

Capacitance in a Series Circuit

1/Ct = 1/C1 + 1/C2 + ... + 1/Cn

Capacitance in a Parallel Circuit

Cparallel = C1 + C2 + ... + Cn

Oscillators

Electronic circuits producing high-frequency alternating currents

Thermocouples

Sensors measuring temperature, converting heat into electrical energy

Inductors

Passive components storing energy in a magnetic field.
Measured in henries (H).

Electrical Shock Hazard

Severity of injury depends on the electric current's magnitude and duration, body resistance, and the current path through the body.
5 mA: Slight shock, not painful
6-25 mA: Painful shock, loss of muscular control
50-150 mA: Freezing current (cannot let go), life threatening

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Description

Test your knowledge on essential safety regulations related to electrical work. This quiz covers topics such as minimum safe distances from power lines, types of ladders that can be used near hazards, and definitions of hazardous materials. Ensure you understand the key safety measures to prevent incidents in the workplace.