Podcast
Questions and Answers
What is the primary function of a Ground Fault Circuit Interrupter (GFCI)?
What is the primary function of a Ground Fault Circuit Interrupter (GFCI)?
- To regulate voltage fluctuations in the electrical system.
- To provide backup power during power outages.
- To offer personal protection against lethal electrical shock or electrocution. (correct)
- To increase the efficiency of electrical appliances.
According to the module, what should be done before undertaking any electrical wiring job or installing electrical fixtures?
According to the module, what should be done before undertaking any electrical wiring job or installing electrical fixtures?
- Prepare all necessary tools and equipment and wear appropriate PPE. (correct)
- Skip safety procedures if the job needs to be done quickly.
- Turn on the power supply to test the circuit.
- Ensure the work area is wet to improve grounding.
If electrical wiring is installed incorrectly, what is a potential consequence?
If electrical wiring is installed incorrectly, what is a potential consequence?
- Improved energy efficiency of the devices.
- Increased compatibility with different voltage systems.
- Damage to devices or malfunctioning, leading to reduced device life. (correct)
- Automatic correction by the electrical system.
Besides type of building construction, what factors should be considered before electrical installation work?
Besides type of building construction, what factors should be considered before electrical installation work?
As per module, where should a GFCI outlet be installed to prevent electrical shock?
As per module, where should a GFCI outlet be installed to prevent electrical shock?
What does the Philippine Electrical Code (PEC) require regarding exposed metal on equipment and appliances?
What does the Philippine Electrical Code (PEC) require regarding exposed metal on equipment and appliances?
According to the procedures for installing a GFCI outlet, what is the first step?
According to the procedures for installing a GFCI outlet, what is the first step?
Why is placing a strip of tape with 'Do not touch' on the breaker recommended when installing a GFCI outlet?
Why is placing a strip of tape with 'Do not touch' on the breaker recommended when installing a GFCI outlet?
In what order should the wires be removed from an outlet? (Starting with the Module)
In what order should the wires be removed from an outlet? (Starting with the Module)
What is the recommended action immediately after ensuring the power is off and removing the cover plate?
What is the recommended action immediately after ensuring the power is off and removing the cover plate?
What does 'GFCI' stand for?
What does 'GFCI' stand for?
What is the purpose of the 'test' and 'reset' buttons on a GFCI outlet?
What is the purpose of the 'test' and 'reset' buttons on a GFCI outlet?
Why is it important to periodically test GFCI outlets?
Why is it important to periodically test GFCI outlets?
What could be the result of the circuit breaker not tripping, if someone is in contact with the earth ground and simultaneously touches the metal chassis of an appliance with a wire insulation fault?
What could be the result of the circuit breaker not tripping, if someone is in contact with the earth ground and simultaneously touches the metal chassis of an appliance with a wire insulation fault?
If installing a GFCI, what does connecting all exposed metal of equipment and appliances to an equipment grounding conductor achieve?
If installing a GFCI, what does connecting all exposed metal of equipment and appliances to an equipment grounding conductor achieve?
If the sum of resistances in a fault path is less than 5.5 ohms, what will occur?
If the sum of resistances in a fault path is less than 5.5 ohms, what will occur?
What is the function of the equipment grounding conductor connected to the metal chassis of an appliance?
What is the function of the equipment grounding conductor connected to the metal chassis of an appliance?
What is the fatal level of electric current that causes ventricular fibrillation?
What is the fatal level of electric current that causes ventricular fibrillation?
Why is it essential to interpret the electrical plan before installing floor and GFCI outlets?
Why is it essential to interpret the electrical plan before installing floor and GFCI outlets?
What standard is mentioned as a reference for GFCI installation procedures?
What standard is mentioned as a reference for GFCI installation procedures?
In the procedures for installing a GFCI outlet, after attaching the wires and before replacing the cover, what should you do?
In the procedures for installing a GFCI outlet, after attaching the wires and before replacing the cover, what should you do?
When testing a GFCI outlet, what indicates that the GFCI is working correctly?
When testing a GFCI outlet, what indicates that the GFCI is working correctly?
According to the safety rules and practices during laboratory work, what should you do before installing any electrical materials?
According to the safety rules and practices during laboratory work, what should you do before installing any electrical materials?
What tool is used to determine if an outlet's power is turned off?
What tool is used to determine if an outlet's power is turned off?
During GFCI outlet replacement, which wire is attached to the green screw?
During GFCI outlet replacement, which wire is attached to the green screw?
When separating wires from the box during GFCI installation, what does the ‘load’ refer to?
When separating wires from the box during GFCI installation, what does the ‘load’ refer to?
If a human body has an average resistance of 500 ohms, what earth fault voltage is enough to cause dangerous electric shock?
If a human body has an average resistance of 500 ohms, what earth fault voltage is enough to cause dangerous electric shock?
A GFCI receptacle has two holes in the back, what is this called?
A GFCI receptacle has two holes in the back, what is this called?
Approximately, how often should you test your GFCI outlets?
Approximately, how often should you test your GFCI outlets?
Flashcards
What is a GFCI?
What is a GFCI?
A device that offers personal protection against electrical shock by stopping electrical power within milliseconds.
Wiring Device Installation
Wiring Device Installation
Electrical wiring devices must be installed correctly and safely in accordance with electrical regulations and standards.
GFCI (Ground Fault Circuit Interrupter)
GFCI (Ground Fault Circuit Interrupter)
An automatic device that offers personal protection against lethal electrical shock or electrocution.
GFCI Protection Near Sinks
GFCI Protection Near Sinks
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PEC Grounding Requirement
PEC Grounding Requirement
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GFCI Outlet Install Steps
GFCI Outlet Install Steps
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First step for GFCI install
First step for GFCI install
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Check Power is Off
Check Power is Off
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GFCI wiring color scheme
GFCI wiring color scheme
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Testing GFCI Outlets
Testing GFCI Outlets
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Purpose of Grounding Wire
Purpose of Grounding Wire
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Study Notes
- The module focuses on National Electrical Code (NEC) provisions for installing wiring devices and Ground Fault Circuit Interrupters (GFCIs)
- The module helps master skills in electrical installation and maintenance
Module Expectations
- Understand NEC provisions for installing wiring devices
- Install GFCI outlets according to standards
- Follow safety procedures for wiring device installation according to OHS standards
True or False Review
- GFCI protection is now required for 15 or 20A, 125V receptacles located outdoors and accessible to the public
- GFCI protection is specified for outlets that supply boat hoists
- The PEC requires all exposed metal on equipment and appliances to be connected to an equipment grounding conductor
- Understanding the electrical plan is a necessary step to properly install wiring devices
- GFCI outlets are required in kitchens
Key Concepts
- Electrical wiring devices should be installed correctly and safely, following electrical regulations and standards
- Incorrect wiring can damage devices or reduce their lifespan
- Factors to consider during installation work include building construction, ceiling type, wall and floor construction, wiring methods, and installation requirements
- GFCI is an automatic device that protects against lethal electrical shock by stopping electrical power within milliseconds
GFCI Information
- Since the 1970s, GFCIs have saved thousands of lives and halved the number of home electrocutions
- Experts estimate that 70% of home electrocutions each year could be prevented with GFCIs in older homes
- Installing a GFCI in every home and workplace could prevent nearly 70% of the approximately 400 electrocutions that occur each year
GFCI Protection
- GFCI protection is required for receptacles within 6 feet of laundry sinks, wet bar sinks, and utility sinks in dwelling units
- Requirement previously only applied to receptacles in countertop surfaces within 6 feet of wet bar sinks
- All 15 and 20A, 125V receptacles within 6 feet of dwelling unit, laundry, utility sink must be GFCI protected
- GFCI protection is also required for the 15 or 20A, 125V receptacles for heating, air-conditioning, and refrigeration equipment
- NEC specifies that GFCI protection is required for "outlets" that supply boat hoists, whether cord and plug-connected or hard-wired
Electrical Diagram Facts
- It shows the schematic diagram of an appliance without an equipment conductor connected to the metal chassis
- The appliance is on a wood table, which should be isolated
- The appliance is switched "off", but a wire insulation fault occurred before the switch
- The chassis is at an electrical potential of 110 volts with respect to ground
- No fault current flows
Safety and Grounding
- The Philippine Electrical Code (PEC) requires all exposed metal on equipment and appliances to be connected to an equipment grounding conductor
- Normal circumstances, no current flows in
- To trip the circuit, the sum of resistances in the fault path must be less than 5.5 ohms
- Resistance of the human body from one limb to any limb is about 500 ohms
- The PEC requires a grounding electrode resistance (ground-rod) of less than 25 ohms
- 50 mA is the fatal level of electric current that causes ventricular fibrillation
- A 25 volts with earth fault voltage can cause dangerous electric shock without a ground conductor
- Resistance of copper wire, size 12AWG is less than 0.2 ohms
Procedures for Installation of Floor and GFCI Outlets
- Interpret electrical plan
- Ensure correctness of the plan
- Prepare and select wiring devices and tools
- Follow procedure of GFCI as set out by PEC/NEC/NEMA
- Conform to instructions and requirements
Procedures in Installing a GFCI Outlet
- Turn off the power
- Remove the cover plate
- Remove the wires
- Strip the neutral and ground wires
- Attach the GFCI
- Attach the neutral wire
- Push the wires back into the box, and replace the cover
- Test the GFCI outlet
Steps to Follow for GFCI Outlet Installation
- Turn off power and put a "Do not touch" sign on the breaker
- Use a tester to ensure the outlet is deenergized
- Loosen the hot wire, then neutral, then ground
- Attach to the green screw by forming a hook
- GFCIs prevent electrical shock in wet locations
- GFCIs have a test button and a reset button
- The GFCI receptacle has two holes in the back for a stab-in receptacle
- Push the neutral wire into the side with the silver screw and tighten
- Fasten the hot wire in the hole in the side with the brass-colored screw, and tighten it
Testing GFCI Outlets
- Plug an appliance in and turn it on
- Press the test button, the dryer should stop
- Check the power by plugging your device back in
- Once confirmed working, unplug the dryer, press the reset button and replace the cover plate
Laboratory Work Safety
- Proper tool and equipment handling
- Always check material damage before installing
- Always cut off power before undertaking the job
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