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BC Class B-R Electrical FSR study materials
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BC Class B-R Electrical FSR practice questions

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Question 1Electrical Field Safety Representative Certification

Under the Canadian Electrical Code, what is the primary purpose of bonding metal parts that are not intended to carry current?

  1. To reduce radio-frequency interference on signal wiring
  2. To increase the current-carrying capacity of the circuit conductors
  3. To provide a low-impedance path that lets overcurrent devices clear a fault Correct answer.
  4. To lower the building's overall electrical resistance to earth

Explanation

Bonding connects non-current-carrying metal parts so that fault current returns to the source over a low-impedance path, allowing the overcurrent device to open quickly. It is not intended to carry normal load current or to improve the conductivity of the circuit.

Question 2Electrical Field Safety Representative Certification

Which document does a Field Safety Representative rely on as the adopted electrical installation standard in British Columbia?

  1. The Canadian Electrical Code, Part I, as adopted by regulation Correct answer.
  2. Manufacturer installation instructions only
  3. The utility's own internal wiring specification
  4. The National Building Code of Canada alone

Explanation

The province adopts the Canadian Electrical Code, Part I through regulation, and that adopted code is the legal installation standard FSRs enforce. Other documents may supplement it but do not replace the adopted code.

Question 3Electrical Field Safety Representative Certification

A worker receives a shock and is still in contact with an energized conductor. What is the first priority for the rescuer?

  1. Begin CPR while the worker remains in contact
  2. Pull the worker clear by the arm immediately
  3. Isolate the source of supply before touching the worker Correct answer.
  4. Ask the worker to describe the voltage involved

Explanation

The rescuer must first de-energize or isolate the supply, because touching an energized worker can make the rescuer a second victim. Rescue and first aid follow only after the hazard is removed.

Question 4Electrical Field Safety Representative Certification

What does lockout require before work begins on electrical equipment?

  1. A personal lock applied by each worker plus verification that energy is isolated Correct answer.
  2. A verbal warning to coworkers on the same shift
  3. Notification to the utility that work is starting
  4. A sign posted at the panel by the supervisor

Explanation

Lockout means each worker applies a personal lock and then verifies that the equipment is de-energized and cannot be re-energized. Verification by test or other means confirms the isolation is effective.

Question 5Electrical Field Safety Representative Certification

Which of the following best describes the role of the Field Safety Representative in relation to permits?

  1. Approving the project's construction budget
  2. Confirming that regulated electrical work is performed under a valid permit Correct answer.
  3. Arranging the utility's temporary power connection
  4. Issuing municipal building permits for the project

Explanation

The FSR is responsible for ensuring regulated electrical work is covered by the required permit and that the work complies with the code. Permit administration for building and budgeting falls outside that role.

Question 6Electrical Field Safety Representative Certification

A circuit breaker protecting a feeder trips repeatedly. What is the appropriate FSR response?

  1. Install a larger breaker to stop the tripping
  2. Investigate and correct the underlying fault before restoring service Correct answer.
  3. Hold the breaker closed manually until the load stabilizes
  4. Reset the breaker repeatedly until it stays closed

Explanation

Repeated tripping indicates a fault or overload that must be found and corrected; the protective device is doing its job. Restoring service without diagnosis risks fire and injury.

Question 7Electrical Field Safety Representative Certification

What is the purpose of a ground fault circuit interrupter in a wet location?

  1. To disconnect the circuit when the neutral is opened
  2. To limit the total load current to the receptacle rating
  3. To open the circuit quickly at a low level of leakage current to earth Correct answer.
  4. To protect equipment from voltage surges

Explanation

A GFCI detects small differences between line and neutral current, indicating leakage to earth, and opens the circuit fast enough to reduce shock severity. It does not provide surge protection or limit normal load current.

Question 8Electrical Field Safety Representative Certification

Which practice best protects a worker from arc flash when racking a breaker in a live switchboard?

  1. Wearing rated arc-flash PPE and standing to the side of the equipment Correct answer.
  2. Working quickly to reduce exposure time
  3. Wearing only safety glasses and cotton gloves
  4. Having a coworker watch from directly in front

Explanation

Arc-rated PPE plus positioning to the side of the equipment limits exposure to hot gases and molten metal if an arc occurs. Speed and observation do not substitute for rated protection and safe positioning.

Question 9Electrical Field Safety Representative Certification

When must an electrical contractor notify the safety authority before starting regulated work?

  1. Only if the customer requests an inspection
  2. Only after the rough-in is complete
  3. Before work begins, so the required permit is in place Correct answer.
  4. Only when the work exceeds the service capacity

Explanation

Notification and permit acquisition occur before regulated work starts, so the installation is under permit from the outset. Later notification leaves work unpermitted and may require exposure of completed work.

Question 10Electrical Field Safety Representative Certification

A metal raceway is used as the equipment bonding conductor. What condition must be met?

  1. It must be supported every ten metres only
  2. It must be painted on all exterior surfaces
  3. It must be at least twice the size of the circuit conductors
  4. It must be continuous, mechanically secure, and electrically continuous across joints Correct answer.

Explanation

A raceway used for bonding must provide a continuous low-impedance path, including at joints and fittings, and be mechanically sound. Paint, oversizing, and support spacing do not establish electrical continuity.

Question 11Electrical Field Safety Representative Certification

What is the purpose of verifying a circuit is de-energized with a tested voltage meter before touching conductors?

  1. To confirm the isolation actually removed voltage from the conductors Correct answer.
  2. To check that the breaker trip curve is correct
  3. To confirm the conductor insulation rating
  4. To measure the load current on the circuit

Explanation

Testing for absence of voltage verifies that the correct isolation point was operated and no backfeed or stored energy remains. The meter must be proven before and after the test to trust the result.

Question 12Electrical Field Safety Representative Certification

A panel is installed in a location subject to frequent washdown with hose water. Which consideration most affects the selection of the enclosure?

  1. The enclosure's degree of protection against ingress of water Correct answer.
  2. The number of spare breaker spaces
  3. The length of the branch-circuit conductors
  4. The colour of the panel cover

Explanation

In wet or washdown areas the enclosure must have an appropriate ingress protection rating for water, matched to the environment. Cover colour, spare spaces, and conductor length do not address water entry.

Question 13Electrical Field Safety Representative Certification

What does a permit-to-work system achieve on a live-adjacent electrical job?

  1. It replaces the need for personal locks
  2. It guarantees the equipment is de-energized
  3. It transfers liability for accidents to the utility
  4. It documents authorization, hazards, and controls before work proceeds Correct answer.

Explanation

A permit-to-work records that hazards were identified, controls agreed, and authorization given before the task starts. It supports but does not replace isolation, locks, or other controls.

Question 14Electrical Field Safety Representative Certification

An apprentice is asked to work alone on a task that requires a second person for safety. What should the FSR do?

  1. Permit the work if the apprentice holds a first aid certificate
  2. Substitute a phone check-in for the second person
  3. Allow the apprentice to proceed if the task is short
  4. Ensure the task is performed with the required second person present Correct answer.

Explanation

Where a task requires a second person, that requirement is a control that must be met regardless of task duration. Substitutions such as phone check-ins do not provide the same rescue capability.

Question 15Electrical Field Safety Representative Certification

Which condition most clearly indicates that a conductor has been overloaded over time?

  1. A clean, bright copper surface at the lug
  2. A label showing the conductor size
  3. A slightly warm cover on a cool day
  4. Discoloured or hardened insulation near a termination Correct answer.

Explanation

Sustained overheating from overload or poor connection degrades insulation, leaving it discoloured, brittle, or hardened. Bright copper and correct labelling are normal conditions.

Question 16Electrical Field Safety Representative Certification

Why must the ampacity of conductors be coordinated with the rating of the overcurrent device?

  1. So the breaker trips less often during normal operation
  2. So the device opens before the conductors are damaged by excess current Correct answer.
  3. So the neutral can be reduced in size
  4. So the conductors can carry more current than the device rating

Explanation

Coordination ensures the protective device operates before conductor insulation is damaged by overheating. Conductors are not permitted to be relied on to carry current beyond their ampacity.

Question 17Electrical Field Safety Representative Certification

What is the key difference between a grounded conductor and a grounding conductor?

  1. The grounding conductor carries normal current while the grounded conductor does not
  2. The grounded conductor is always green while the grounding conductor is white
  3. The grounded conductor carries normal current while the grounding conductor does not Correct answer.
  4. Both conductors carry normal load current in equal amounts

Explanation

The grounded (neutral) conductor is a circuit conductor that carries current during normal operation, whereas the grounding conductor normally carries no current and serves a safety function. Colour identification follows separate rules and is not the defining difference.

Question 18Electrical Field Safety Representative Certification

A worker must verify a live 347-volt lighting circuit. Which combination best reflects safe practice?

  1. Cotton gloves and a basic continuity tester
  2. A non-contact tester used from arm's length
  3. Rated gloves, face protection, and a meter rated for the voltage Correct answer.
  4. Bare hands with insulated pliers only

Explanation

Live verification at utilization voltage requires PPE and test equipment rated for the voltage and energy present. Improvised tools and bare-hand methods do not provide adequate protection.

Question 19Electrical Field Safety Representative Certification

What is the purpose of a disconnect means located at the equipment it serves?

  1. To serve as the overcurrent protective device for the circuit
  2. To meter the energy used by the equipment
  3. To allow the equipment to be isolated locally for servicing Correct answer.
  4. To provide the grounding electrode connection

Explanation

A local disconnecting means lets a worker isolate the equipment for maintenance without travelling to a remote panel. It is not itself the overcurrent device, the grounding connection, or a meter.

Question 20Electrical Field Safety Representative Certification

An FSR finds that a contractor's crew has bypassed an interlock on energized equipment. What is the most appropriate immediate action?

  1. Record the finding and address it at the next project meeting
  2. Stop the work and restore the interlock before any further operation Correct answer.
  3. Ask the crew to sign a waiver accepting the risk
  4. Continue work while monitoring the equipment closely

Explanation

A bypassed interlock is an immediate hazard to life safety and requires stopping the work and restoring the protective function. Documentation, monitoring, or waivers cannot substitute for the safety control.

Question 21Electrical Field Safety Representative Certification

A feeder is protected by a device whose rating exceeds the conductor ampacity, but the load calculation shows the demand is below the conductor ampacity. How should the FSR treat this?

  1. The overcurrent device must not exceed the permitted rating for the conductor regardless of calculated demand Correct answer.
  2. It is acceptable if the conductor is derated for ambient temperature
  3. It is acceptable if the load is intermittent and supervised
  4. It is acceptable because the calculated demand is below the conductor ampacity

Explanation

Protection is based on the conductor's permitted ampacity, not on the present calculated demand, because future or abnormal conditions can load the conductor to its limit. Derating addresses ampacity adjustment but does not justify an oversized device.

Question 22Electrical Field Safety Representative Certification

Two workers each apply a personal lock to a group lockout box. What does this arrangement provide?

  1. The first worker to finish may remove all locks at once
  2. Only one lock is needed because the box is shared
  3. The supervisor alone controls when energy is restored
  4. Each worker retains control so the equipment cannot be re-energized until all locks are removed Correct answer.

Explanation

Group lockout with personal locks ensures the energy-isolating device cannot be restored until every worker has removed their own lock. No individual may remove another worker's lock under normal circumstances.

Question 23Electrical Field Safety Representative Certification

A contractor proposes to energize new equipment before the inspection authority has completed its review. What is the correct FSR position?

  1. Energization must wait until required inspections and approvals are complete Correct answer.
  2. Energization may proceed if the installing crew is experienced
  3. Energization may proceed if only lighting circuits are involved
  4. Energization may proceed if the customer signs an indemnity

Explanation

Regulated work must be inspected and approved where required before the installation is energized and placed in service. Crew experience, indemnities, or the type of circuit do not replace the required approval.

Question 24Electrical Field Safety Representative Certification

Why is it unsafe to rely solely on a non-contact voltage tester to confirm a circuit is dead?

  1. It can indicate falsely due to capacitive coupling or fail to detect some conditions Correct answer.
  2. It cannot be used on alternating current circuits
  3. It requires the circuit to be energized to function
  4. It is always accurate but too slow for practical use

Explanation

Non-contact testers can respond to induced or capacitively coupled voltage and may miss some conditions, so they are not a reliable sole means of proving isolation. A tested contact meter appropriate for the voltage is used to confirm absence of voltage.

Question 25Electrical Field Safety Representative Certification

An FSR is reviewing a design where a bonding conductor is routed through a ferrous metal enclosure opening without a bonding bushing. What concern arises?

  1. Circulating or induced current effects and possible loss of a reliable bonding path Correct answer.
  2. The enclosure will become a grounding electrode
  3. The conductor will carry normal load current
  4. The circuit voltage will increase

Explanation

Where a bonding conductor passes through ferrous metal, induced or circulating currents and heating can occur, and the bonding path may be compromised unless proper bonding is provided at the opening. The conductor does not become a load conductor or an electrode.

Question 26Electrical Field Safety Representative Certification

Which document must an electrical contractor obtain before performing regulated electrical work in British Columbia?

  1. An electrical contractor licence issued by Technical Safety BC Correct answer.
  2. A provincial trade qualification certificate held by each employee
  3. A letter of approval from the local fire department
  4. A municipal business licence only

Explanation

Regulated electrical work in British Columbia must be performed by a licensed electrical contractor holding a valid licence issued by the provincial safety authority, Technical Safety BC. A municipal business licence or fire department letter does not authorize electrical work, and individual trade certification is separate from the contractor licence.

Question 27Electrical Field Safety Representative Certification

Which class of work is a certified Field Safety Representative permitted to authorize on a project?

  1. Only work performed after the utility has energized the service
  2. Only work on residential single-family dwellings
  3. Any work the FSR personally feels competent to inspect
  4. Electrical work within the scope of the FSR certificate class held Correct answer.

Explanation

An FSR's authority is defined by the class of certificate held, and declarations of work must fall within that scope. Feeling personally competent does not extend legal scope, and the timing of utility energization is irrelevant to scope.

Question 28Electrical Field Safety Representative Certification

What is the primary purpose of a lockout tag on an energy-isolating device?

  1. To serve as a permanent record for the maintenance log
  2. To record the date the equipment was last serviced
  3. To identify the person applying the lock and warn others not to operate the device Correct answer.
  4. To indicate the voltage rating of the equipment being isolated

Explanation

A lockout device physically prevents operation of the isolator, while the tag identifies the person who applied it and warns others against removal or operation. Tags are not service records, voltage markings, or log entries.

Question 29Electrical Field Safety Representative Certification

Which body part protection is required when working near exposed energized parts where arc flash hazards exist?

  1. Ordinary cotton coveralls with safety glasses
  2. Leather work gloves alone
  3. A hard hat alone
  4. Arc-rated clothing and face protection appropriate to the incident energy Correct answer.

Explanation

Where an arc flash hazard is present, workers need arc-rated clothing and face protection selected for the incident energy level. Ordinary cotton, a hard hat alone, or leather gloves alone do not provide the thermal protection required against an arc flash.

Question 30Electrical Field Safety Representative Certification

What must be done before a conductor is cut in a raceway that may contain more than one circuit?

  1. Energize the circuit to confirm identification
  2. Assume the raceway contains only the circuit being worked on
  3. Cut quickly to reduce exposure time
  4. Confirm which circuits are present and isolate all of them Correct answer.

Explanation

Raceways often carry multiple circuits, so all circuits in the raceway must be identified and isolated before cutting. Cutting quickly or assuming a single circuit risks contacting an energized conductor, and energizing to confirm identification is dangerous.

Question 31Electrical Field Safety Representative Certification

What is the minimum content of a documented job hazard assessment for electrical work?

  1. Identification of hazards, controls, and the persons responsible Correct answer.
  2. The crew's lunch schedule
  3. A list of tools required for the task
  4. The customer's billing address

Explanation

A job hazard assessment must identify the hazards present, the controls that will be applied, and who is responsible for implementing them. Tool lists and administrative details do not satisfy the hazard assessment requirement.

Question 32Electrical Field Safety Representative Certification

Which conductor colour is commonly used to identify the grounded conductor in a typical branch circuit?

  1. White or grey Correct answer.
  2. Orange
  3. Red
  4. Green

Explanation

The grounded (neutral) conductor is identified by white or grey insulation in standard branch circuits. Green identifies bonding conductors, while red and orange are used for ungrounded (hot) conductors.

Question 33Electrical Field Safety Representative Certification

Why must temporary wiring on a construction site be protected from physical damage?

  1. To keep the site looking tidy for inspections
  2. To satisfy the general contractor's schedule
  3. To reduce the risk of insulation damage that could cause shock or fire Correct answer.
  4. To lower the electrical bill

Explanation

Temporary wiring is exposed to traffic, equipment, and weather, so physical protection prevents insulation damage that could lead to shock or fire. Appearance, cost, and scheduling are not the safety basis for the requirement.

Question 34Electrical Field Safety Representative Certification

A worker reports receiving a mild tingle from a metal enclosure. What should the FSR direct as the first action?

  1. Paint the enclosure to insulate it
  2. Continue work and monitor the situation
  3. Treat the enclosure as energized and isolate the circuit until the fault is found Correct answer.
  4. Increase the load to confirm the fault

Explanation

A tingle indicates a possible fault energizing the enclosure, so the circuit must be isolated and the fault located before work continues. Painting, monitoring, or increasing load does not remove the shock hazard and could worsen it.

Question 35Electrical Field Safety Representative Certification

Which condition most reduces the effectiveness of a bonding conductor?

  1. A conductor run in a straight line
  2. A conductor sized larger than required
  3. A conductor with continuous insulation
  4. A loose connection at a bonding lug Correct answer.

Explanation

A loose connection raises resistance in the bonding path, which can prevent fault current from tripping the overcurrent device quickly and leave metal parts energized. Oversizing, straight routing, and continuous insulation do not impair bonding effectiveness.

Question 36Electrical Field Safety Representative Certification

What is the purpose of a ground fault circuit interrupter on a construction site receptacle?

  1. To convert AC to DC for tools
  2. To limit the total load on the circuit
  3. To detect current leaking to ground and interrupt the circuit quickly Correct answer.
  4. To protect equipment from voltage surges

Explanation

A GFCI monitors the difference between outgoing and returning current and trips when leakage to ground is detected, reducing shock risk. It is not a load limiter, converter, or surge protector.

Question 37Electrical Field Safety Representative Certification

An FSR discovers that a crew has installed a receptacle without a bonding connection to the box. What is the most appropriate action?

  1. Ask the customer whether they want it fixed
  2. Direct correction of the defect before the circuit is energized Correct answer.
  3. Energize the circuit and observe for problems
  4. Leave it and note it for the next project

Explanation

A missing bonding connection is a shock hazard that must be corrected before the circuit is energized. Deferring, energizing to observe, or leaving the decision to the customer does not fulfill the FSR's duty to ensure compliance.

Question 38Electrical Field Safety Representative Certification

What does an FSR's declaration of work signify?

  1. That the work complies with the applicable electrical code and regulations Correct answer.
  2. That the utility has connected the service
  3. That the customer has paid all invoices
  4. That the work was performed by the lowest bidder

Explanation

A declaration of work is the FSR's formal statement that the regulated work complies with the applicable code and regulations. It is unrelated to pricing, payment status, or utility connection.

Question 39Electrical Field Safety Representative Certification

Which practice best controls the risk of backfeed when working on a circuit supplied by a transfer switch?

  1. Work only during daylight hours
  2. Ask the utility to warn the crew
  3. Open the main breaker and trust the transfer switch
  4. Isolate and lock the transfer switch and verify absence of voltage Correct answer.

Explanation

Transfer switches can backfeed a circuit from a generator or alternate source, so the switch must be isolated, locked, and the circuit verified de-energized. Trusting a single breaker, relying on utility warnings, or scheduling work by time of day does not control backfeed.

Question 40Electrical Field Safety Representative Certification

A crew proposes to use a metal ladder while working near an energized panel. What should the FSR advise?

  1. Use a non-conductive ladder or another safe access method Correct answer.
  2. Wrap the ladder in tape
  3. Have a second worker hold the ladder
  4. Proceed if the ladder is clean

Explanation

Metal ladders conduct electricity and create a serious shock hazard near energized equipment, so a non-conductive ladder or other safe access is required. Cleaning, taping, or holding the ladder does not remove the conductive hazard.

Question 41Electrical Field Safety Representative Certification

What is the purpose of maintaining clear working space in front of electrical equipment?

  1. To allow safe operation and escape in an emergency Correct answer.
  2. To improve the appearance of the room
  3. To reduce the length of conduit runs
  4. To store tools conveniently

Explanation

Clear working space provides room to operate equipment safely and to escape if an arc flash or fire occurs. Appearance, storage, and conduit routing are not the safety basis for the requirement.

Question 42Electrical Field Safety Representative Certification

An FSR finds a panel directory that does not match the circuits actually installed. What is the most appropriate response?

  1. Ignore it because the directory is only a convenience
  2. Leave it and let the next electrician fix it
  3. Remove the directory to avoid confusion
  4. Require the directory to be corrected and verified before sign-off Correct answer.

Explanation

An inaccurate directory can cause a worker to isolate the wrong circuit, so it must be corrected and verified before sign-off. Ignoring or removing it leaves a dangerous source of error for future work.

Question 43Electrical Field Safety Representative Certification

Which factor most affects the level of arc flash incident energy at a piece of equipment?

  1. The available fault current and the clearing time of the protective device Correct answer.
  2. The number of spare breakers installed
  3. The length of the branch circuit conductors
  4. The colour of the enclosure

Explanation

Incident energy depends primarily on the magnitude of available fault current and how quickly the protective device clears the fault. Enclosure colour, spare breakers, and conductor length are not primary determinants of incident energy.

Question 44Electrical Field Safety Representative Certification

What should an FSR do if a worker refuses to perform a task because of a safety concern?

  1. Investigate the concern and resolve it before requiring the task Correct answer.
  2. Ignore the refusal and continue the job
  3. Reassign the task to an untrained worker
  4. Discipline the worker for insubordination

Explanation

Workers have the right to refuse unsafe work, so the FSR must investigate the concern and resolve it before the task proceeds. Discipline, reassignment to an untrained worker, or ignoring the refusal would compound the hazard.

Question 45Electrical Field Safety Representative Certification

A contractor wants to use a new type of connector not covered by the existing approved listing. What should the FSR require?

  1. Verify it is approved for the application or obtain an acceptable field evaluation Correct answer.
  2. Use it because it is new technology
  3. Install it and observe for failures
  4. Use it only on temporary circuits

Explanation

Electrical products must be approved for their intended use, so an unlisted connector requires verification of approval or an acceptable field evaluation before installation. Installing to observe, restricting to temporary circuits, or assuming newness implies safety does not satisfy the requirement.

Question 46Electrical Field Safety Representative Certification

Which situation requires the FSR to reassess the hazard assessment during the job?

  1. When the customer requests a meeting
  2. When the weather changes or new equipment arrives on site Correct answer.
  3. Only after an injury occurs
  4. Only at the start of the project

Explanation

Hazard assessments must be updated whenever conditions change, such as weather, new equipment, or altered work methods. A single start-of-project assessment or post-injury review does not keep pace with changing site conditions.

Question 47Electrical Field Safety Representative Certification

An FSR is asked to sign a declaration for work performed by another crew that the FSR did not supervise. What is the appropriate response?

  1. Sign with a note disclaiming responsibility
  2. Decline unless the FSR can verify the work complies Correct answer.
  3. Sign because the other crew is licensed
  4. Sign and inspect later if time permits

Explanation

The FSR's declaration attests to compliance, which requires actual verification of the work. Signing for unverified work, even with a disclaimer, misrepresents the declaration and shifts risk to the public.

Question 48Electrical Field Safety Representative Certification

A generator is installed to supply a building during outages. Which arrangement best prevents hazardous backfeed to the utility?

  1. An oversized generator
  2. A transfer switch that isolates the utility supply before the generator is connected Correct answer.
  3. A manual plug-and-cord connection to a dryer outlet
  4. A warning sign at the main panel

Explanation

A transfer switch mechanically prevents the generator and utility supply from being connected at the same time, eliminating backfeed to the utility lines. Cord connections, signs, or generator sizing do not provide positive isolation.

Question 49Electrical Field Safety Representative Certification

What is the most appropriate way to verify that a bonding conductor is continuous end to end?

  1. Asking the installer to confirm
  2. A continuity test using an approved instrument Correct answer.
  3. Visual inspection alone
  4. Checking the conductor size against the code table

Explanation

Continuity must be confirmed with an approved test instrument, because visual inspection cannot reveal a hidden break or a loose termination inside a raceway. Size checks and verbal confirmation do not prove electrical continuity.

Question 50Electrical Field Safety Representative Certification

An FSR reviews a design where a bonding conductor passes through a ferrous metal enclosure opening without a bonding bushing. What is the primary concern?

  1. Circulating currents and heating may occur in the metal around the conductor Correct answer.
  2. The conductor may be damaged by abrasion only
  3. The enclosure will become a better conductor
  4. The conductor will carry too little current

Explanation

When a bonding conductor passes through a ferrous opening, magnetic effects can induce circulating currents and heating in the surrounding metal, so a bonding bushing or equivalent is used to address this. Abrasion is a secondary concern, and the issue is not insufficient current capacity or improved conductivity.