Class F flashcards

35 cards. Read the term and the definition here. The deck at the top of this page is optional.

License scope

The set of tasks and system types a Class F license legally permits. Work outside that scope is a violation even if the person is otherwise qualified.

Continuing education requirement

A fixed number of approved training hours a licensee must complete during each renewal cycle before the license can be renewed.

Strict liability licensing offense

Operating with an expired or invalid license is a violation regardless of the operator's knowledge or good-faith belief that the license was current.

Change-of-information notification

A licensee must report changes of address, name, or employer to the licensing authority in writing within the window set by regulation.

Record retention rule

Licensing documents, test records, and work logs must be kept for the regulatory retention period and produced on request during an inspection.

Progressive discipline ladder

Enforcement typically escalates from warning to fine to suspension to revocation, with repeat violations inside a set period moving up a tier.

Governing code edition

The code edition in force on the date the work is performed controls, not the edition that was current when the license was issued.

Lockout/tagout sequence

Isolate all energy sources, apply a personal lock to each, attach tags, then verify zero energy by direct test before starting work.

Tag versus lock

A tag is only a warning label and provides no physical protection. A lock physically prevents re-energizing and is the required control.

Hierarchy of controls

Risk controls ranked from most to least effective: elimination, substitution, engineering controls, administrative controls, then personal protective equipment last.

Confined-space pre-entry testing

Before entry, test the atmosphere for oxygen content, flammable gas, and toxic gas, and post a stand-by attendant with a rescue plan.

Treat as energized

All conductors are assumed live until tested and grounded. Test instruments must be rated for the available voltage and fault current.

Fire triangle

Combustion requires fuel, oxygen, and an ignition source. Removing any one leg stops the fire, and the extinguisher class must match the fuel.

Fall protection trigger

Fall protection must be used at the height set by the applicable rule, with anchors rated to the required strength and located above the worker.

Incident reporting duty

Injuries and near misses must be reported within the required time, and the scene and equipment preserved until the investigator releases them.

Overcurrent device selection

Two independent criteria apply: the continuous current rating must carry the load, and the interrupting capacity must exceed the available fault current.

Ampacity adjustment factors

Conductor current capacity is reduced for high ambient temperature and for multiple current-carrying conductors bundled in the same raceway or cable.

Grounded versus grounding conductor

The grounded neutral carries normal return current. The equipment grounding conductor carries fault current only and must never carry normal current.

Voltage drop formula

For a single-phase two-wire circuit, VD equals two times K times current times one-way length, divided by circular-mil area.

Transformer current ratio

Secondary current relates to primary current inversely with the turns ratio, so a step-down in voltage produces a step-up in current.

Ground-fault device threshold

A ground-fault protective device senses current imbalance and trips at a threshold far below the overload trip point of a standard breaker.

Ambient derating

A device rated for a given current at a reference ambient temperature must be derated when installed where the ambient is higher.

Dissimilar metal connectors

Terminals and connectors must be listed for the conductor material. Joining dissimilar metals requires a connector rated for that combination to prevent galvanic corrosion.

Listing and labeling rule

Equipment must be installed per its listing and the manufacturer's instructions. Listing conditions override generic field practice when the two conflict.

Minimum bending radius

Each cable and raceway type has a minimum bend radius expressed as a multiple of its diameter, set by type and voltage class.

Termination torque

Lugs and terminals must be tightened to the manufacturer's specified torque with a calibrated tool. Loose terminations are a leading cause of overheating.

Condition-based maintenance

Servicing is scheduled from measured condition such as thermal scans and insulation-resistance trends, not only after a failure occurs.

Modification and listing

Altering a listed assembly can void the listing unless the change is evaluated and approved by a recognized testing body.

Working space clearance

Clear working space is measured outward from the equipment face and must stay unobstructed. Storing material in that space is prohibited.

Insulation resistance trending

A DC test voltage is applied and resistance recorded. Results are judged against prior baseline readings for the same equipment, not a single number.

Continuity test setup

Continuity is measured on a de-energized circuit, with meter leads nulled or zeroed first so lead resistance does not mask the true reading.

Divide-and-conquer isolation

Test at the midpoint of the suspect circuit, then halve the segment containing the fault repeatedly until the defective component is located.

Thermal scan condition

Infrared scanning reveals high-resistance joints only while the circuit is energized and carrying load current. A de-energized scan shows nothing.

Ground-fault trip test

The device is injected at its rated trip current and the trip time measured. A device that fails to trip within its rating is removed from service.

Test record contents

Each record should capture the date, tester identity, instrument calibration status, test conditions, and results so readings can be compared over time.