NFPA 70B 2023 Edition: Standard for Electrical Equipment Maintenance Flashcards

Exactly 200 question-and-answer flashcards covering definitions, general requirements, maintenance intervals, and specific equipment systems from NFPA 70B 2023 Edition.

What is the scope of NFPA 70B 2023?

Preventive maintenance of electrical, electronic, and communications systems and equipment.

What is the purpose of the NFPA 70B standard?

To provide for the practical safeguarding of persons, property, and processes from risks associated with failure, breakdown, or malfunction by establishing a condition of maintenance.

To what types of installations does NFPA 70B typically apply?

Industrial plants, institutional and commercial buildings, and large multifamily residential complexes.

What is specifically excluded from the scope of NFPA 70B?

Consumer appliances and equipment intended primarily for use in the home.

What must be done to verify a document is the current edition of an NFPA standard?

Consult the National Fire Codes Subscription Service or the 'List of NFPA Codes & Standards' at www.nfpa.org/docinfo.

What does an asterisk (*) following a paragraph number indicate?

That explanatory material on the paragraph can be found in Annex A.

What is the meaning of a reference in brackets [ ] following a section?

It indicates material that has been extracted from another NFPA document.

According to NFPA 70B, which system of units is considered the primary unit?

The International System of Units (SI).

What are secondary units of measurement in this standard?

US customary units (inch-pound units).

What does 'Approved' mean in the context of NFPA 70B?

Acceptable to the authority having jurisdiction.

Define 'Authority Having Jurisdiction (AHJ)'.

An organization, office, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure.

What is the definition of 'Labeled'?

Equipment or materials with an attached label or identifying mark from an organization acceptable to the AHJ that indicates compliance with standards.

What does the term 'Listed' signify?

Equipment, materials, or services included in a list published by an organization acceptable to the AHJ, stating they meet designated standards or are suitable for a specified purpose.

What does the word 'Shall' indicate?

A mandatory requirement.

What is an NFPA 'Standard'?

A document where the main text contains only mandatory provisions using 'shall'.

What is an 'Adjustable Speed Drive'?

Power conversion equipment that provides a means of adjusting the speed of an electric motor.

Define 'Appliance' per NFPA 70.

Utilization equipment, generally other than industrial, fastened in place, stationary, or portable, normally built in standardized sizes.

What is an 'Arc Flash Hazard'?

A source of possible injury or damage to health associated with the release of energy caused by an electric arc.

What does 'Bonded (Bonding)' mean?

Connected to establish electrical continuity and conductivity.

What is a 'Bonding Conductor (Bonding Jumper)'?

A conductor that ensures the required electrical conductivity between metal parts.

What is a 'Busway'?

A raceway consisting of a metal enclosure containing factory-mounted conductors, usually copper or aluminum bars, rods, or tubes.

What is a 'Circuit Breaker'?

A device designed to open and close a circuit by nonautomatic means and to open automatically on a predetermined overcurrent without damage to itself.

What is 'Commissioning'?

The processes used to verify initial performance, operational controls, and safety systems prior to placing equipment into active service.

Define 'Condition of Maintenance'.

The state of electrical equipment considering manufacturer's instructions, recommendations, and applicable industry codes.

What is 'Continuous Monitoring'?

An uninterrupted method of data collection utilizing permanently mounted counters, sensors, or controllers.

What is a 'Coordination Study'?

A system planning process used to assist in selecting and setting protective devices to improve power system reliability.

Define 'Corona'.

An electrical discharge phenomenon occurring in gaseous substances, such as air.

What is a 'Disconnecting Means'?

A device or group of devices by which the conductors of a circuit can be disconnected from their source of supply.

What is an 'Electrical Maintenance Program (EMP)'?

A managed program of inspecting, testing, monitoring, analyzing, and servicing electrical systems to maintain safe operations.

Define 'Electrically Safe Work Condition'.

A state where a conductor is disconnected from energized parts, locked/tagged, tested for absence of voltage, and temporarily grounded.

Who is an 'EMP Coordinator'?

The individual responsible for coordinating the implementation and operation of the EMP.

What is an 'Energy Storage System (ESS)'?

One or more devices capable of storing energy and providing electrical energy into the premises wiring system.

What is 'Mobile Equipment'?

Equipment with electrical components suitable to be moved only with mechanical aids or provided with wheels.

What is 'Available Fault Current'?

The largest amount of current capable of being delivered at a point on the system during a short-circuit condition.

What does 'Ground' refer to?

The earth.

What is a 'Grounded Conductor'?

A system or circuit conductor that is intentionally grounded.

What is a 'Ground Fault'?

An unintentional connection between an ungrounded conductor and non-current-carrying conductors, enclosures, or earth.

What is the purpose of a 'Ground-Fault Circuit Interrupter (GFCI)'?

The protection of personnel by de-energizing a circuit when ground-fault current exceeds values established for a Class A device.

What is 'Ground-Fault Protection of Equipment'?

A system intended to protect equipment from damaging line-to-ground fault currents by opening all ungrounded conductors.

What is an 'Equipment Grounding Conductor (EGC)'?

A conductive path that connects non-current-carrying metal parts of equipment to the system grounded conductor or electrode.

Define 'Grounding Electrode'.

A conducting object through which a direct connection to earth is established.

What is a 'Grounding Electrode Conductor'?

A conductor used to connect the system grounded conductor or equipment to a grounding electrode.

What is a 'Ground Loop'?

Multiple intentional or unintentional connections from a conductive path to ground.

Define 'Harmonics'.

Voltages or currents whose frequencies are integer multiples of the fundamental system frequency.

What are 'Interharmonics'?

Voltages or currents whose frequencies are not integer multiples of the fundamental frequency.

What is a 'Long-Duration Undervoltage'?

A decrease of supply voltage to less than $90\%$ of nominal voltage for a duration greater than $1\,\text{minute}$.

Define 'Maintenance Interval'.

The frequency of maintenance activities determined by the type, criticality, and condition of equipment.

What is a 'Motor Control Center'?

An assembly of enclosed sections having a common power bus and containing motor control units.

What is 'Noise' in an electrical circuit?

Undesirable electrical signals in an electrical or electronic circuit.

Define 'Overcurrent'.

Any current in excess of the rated current of equipment or the ampacity of a conductor, resulting from overload, short circuit, or ground fault.

What is a 'Branch-Circuit Overcurrent Protective Device'?

A device capable of providing protection for service, feeder, and branch circuits over the full range of overcurrents.

What is an 'Overload'?

Operation of equipment or conductors in excess of normal rating that would cause damage if it persists for sufficient time.

Define 'Panelboard'.

A single panel or group of units designed for assembly in a single panel, including buses and automatic overcurrent devices.

What is 'Power Quality'?

Electrical phenomena used to quantify the supply quality, including transients, sags, swells, interruptions, and harmonics.

What are 'Predictive Techniques'?

Analytics, algorithms, or software that interpret data to provide recommendations to address identified problems.

Definition of a 'Qualified Person'.

One who has demonstrated skills and knowledge related to the operation of electrical equipment and received safety training.

What does 'Reconditioned' mean?

Electromechanical systems restored to operating conditions, differing from normal servicing or one-to-one replacement.

Define 'Risk Assessment'.

A process that identifies hazards, estimates likelihood and severity of injury, and determines if protective measures are required.

What is a voltage 'Sag'?

A decrease to between $10\%$ and $90\%$ of normal voltage for durations of $0.5\,\text{cycle}$ to $1\,\text{minute}$.

What is the 'Service Point'?

The point of connection between the facilities of the serving utility and the premises wiring.

Define 'Servicing'.

Following a manufacturer's set of instructions to analyze, adjust, or perform actions to preserve or restore performance.

What is a 'Single-Line Diagram'?

A diagram showing the course of an electric circuit and its component parts using single lines and graphic symbols.

What is a 'Special Purpose Ground-Fault Circuit Interrupter (SPGFCI)'?

A device intended for ground-fault detection in circuits with voltage to ground greater than $150\,V$.

What is a 'Stationary Standby Battery'?

A battery that spends the majority of time on continuous float charge in readiness for a discharge event.

Define 'Survey' in the context of an EMP.

The collection of accurate data on the electrical system to obtain information for developing the EMP.

What is a 'Sustained Voltage Interruption'?

The loss of supply voltage to less than $10\%$ on one or more phases for a period greater than $1\,\text{minute}$.

Define a voltage 'Swell'.

An increase to between $110\%$ and $180\%$ of normal voltage for durations from $0.5\,\text{cycle}$ to $1\,\text{minute}$.

What is a 'Switchboard'?

A large single panel or assembly of panels on which switches, overcurrent devices, and buses are mounted.

Define 'Switchgear'.

A metal-enclosed assembly containing primary power circuit switching or interrupting devices with buses.

What are 'Acceptance Tests'?

Tests performed on new equipment prior to energization to determine compliance with purchase and design specifications.

What are 'As-Found Tests'?

Tests performed on equipment before maintenance work is performed.

What are 'As-Left Tests'?

Tests performed on equipment after maintenance work is performed.

What are 'Enhanced Tests'?

Tests performed on equipment thought to be defective or subjected to conditions adversely affecting its characteristics.

Define 'Standard Tests'.

Tests performed at regular intervals over the service life of equipment, typically in conjunction with maintenance.

What is a 'Power Transformer' rating?

A transformer rated greater than $500\,kVA$.

What are 'Transients'?

Very short duration, high amplitude excursions outside the limits of the normal voltage and current waveform.

Define 'Unbalanced Voltages'.

Unequal voltage values on 3-phase circuits.

What is 'Utilization Equipment'?

Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, or lighting purposes.

In the absence of manufacturer's instructions, how should equipment be maintained?

In accordance with industry consensus standards.

What is the general requirement for an overall EMP as stated in Section 4.2.1?

The equipment owner shall implement and document an overall EMP that directs activity appropriate to safety and operational risks.

What must equipment-specific maintenance tasks be based on?

Information gathered during inspection.

How often must the EMP be audited?

At intervals not to exceed $5\,\text{years}$.

Who is responsible for conducting electrical maintenance?

A qualified person trained in specific maintenance tasks, test methods, equipment, PPE, and hazards.

How often must the employer determine if an employee is complying with maintenance procedures?

On at least an annual basis.

When must a person responsible for maintenance receive additional training or retraining?

If annual inspections indicate non-compliance, if new technology is introduced, or if job duties change.

What are the three required details for training documentation?

Content of the training, the person's name, and the dates of training.

How long must training documentation be retained?

For the duration of the person's employment.

What environment or conditions should be considered when determining maintenance frequency?

Environmental, physical, and operating conditions.

What are the Objectives of Field Testing (8.1)?

Ascertain ability to continue performance, determine necessity of repair, document condition over service life, and provide condition results.

Name two special chemical considerations for risk assessments in Chapter 8.

$SF_6$ gas fault by-products and Electrolytes.

What is a Category 1 test?

Online standard test.

What is a Category 1A test?

Online enhanced test.

What is a Category 2 test?

Offline standard test.

What is a Category 2A test?

Offline enhanced test.

What is the designated state for equipment that passes all tests and is sound?

Serviceable.

Define 'Limited Service' designation for equipment.

Equipment has problems that are not detrimental to protective operation or design characteristics.

What is the status of 'Nonserviceable' equipment?

Equipment that has a problem detrimental to proper electrical or mechanical operation.

Once establishing an initial frequency, how long must it be adhered to?

At least two maintenance cycles, unless unexpected failures occur.

What determine the maintenance interval according to Table 9.2.2 if manufacturer's data is missing?

Equipment condition assessment (Condition 1, 2, or 3).

What defines Equipment Physical Condition 1?

Like new condition, clean/tight enclosure, no unaddressed monitoring alerts, no active predictive recommendations.