Grounding, Bonding, ESD, and Physical Security Lecture Notes

This flashcard set covers the basic facts and terms of grounding, bonding, ESD, physical security, and general workplace safety based on the Air Force cyber-technician study guide.

Grounding

A safety and electrical engineering practice involving the connection of an electrical conductor or system to the Earth or a large conductive body, providing a conductive path between the earth and the grounded object.

Transient Voltage

Brief surges of electricity usually resulting from components suddenly releasing stored electricity or from outside sources like electrostatic discharge (ESD) or lightning.

Electromagnetic Interference (EMI)

Also known as electrical noise, this is a disruption in electricity that produces fluctuations in voltage or current, negatively impacting equipment performance and data transfer.

Facility Ground System

A system that forms a direct path of low impedance between the earth and various power, communications, and other equipment, composed of an earth electrode, fault protection, and signal reference subsystems.

Earth Electrode Subsystem

The part of the facility ground system located "in the dirt" that brings the system or building to the same potential as the earth using buried conductors like copper ground rods.

Equipment Fault Protective Subsystem

Often called the "safety ground," it protects personnel and equipment from voltages caused by faults by enabling protective devices like fuses or circuit breakers to operate.

Signal Reference Subsystem

Commonly known as the "signal ground," it establishes a common voltage reference point for signal circuits and controls electrical noise and static by tying equipment together on an equipotential plane.

Multipoint System

A type of signal reference subsystem used in data communications to maintain a common reference voltage at multiple points within a network, such as connecting all racks and cabinets to a common metal grid.

Bonding

The establishment of a low-impedance path between two metal surfaces to minimize voltage differences and ensure electrical continuity.

Impedance

The opposition electricity faces when flowing through a material, considering both resistance and the behavior of current when encountering specific components.

Direct Permanent Bonds

Bonds formed by welding or brazing that are expected to remain intact throughout the life of the system and do not require disassembly.

Direct Semi-permanent Bonds

Bonds where metal surfaces are rigidly held together by bolts, nuts, or clamps, allowing for future disassembly; often used in mobile or deployed environments.

Indirect Bonds

The use of bonding straps (solid, braided, round, or flat) to interconnect separate conductors when direct bonding is not practical, such as for moving doors.

Electrostatic Discharge (ESD)

The sudden flow of electricity between two electrically charged objects caused by a buildup of static electricity transferred when they touch.

Difference in Potential

The voltage or electrical pressure variance between two points in a circuit that drives the flow of electric charge.

Triboelectricity

The resultant charge developed through friction, commonly referred to as static electricity or electricity at rest.

Catastrophic Failure

A type of ESD damage resulting in the total and immediate failure of a component or circuit, often caused by heat that melts or welds components.

Intermittent Failure

A failure mode where a component works correctly sometimes but not others, making it difficult to duplicate for troubleshooting.

Latent Failure

A delayed failure where a component appears to operate normally initially but experiences a shortened life span and premature failure due to degradation from ESD.

Physical Security

Active and passive measures designed to prevent unauthorized access to official resources, such as personnel, equipment, and documents.

Control Area

A security area requiring identification for access, such as a military base, medical pharmacy, or a communications squadron server room.

Restricted Area

An area limited by both a special access badge and a specific purpose for being there, such as a flight line or a National Security Agency (NSA) facility.

No-Lone Zone

An area where personnel are prohibited from being alone and must be accompanied by a companion, such as in a classified shred or burn area.

Active Measures

Security systems and technologies designed to deter, detect, report, and react against threats, including barriers, cameras, and armed patrols.

Passive Measures

The use of architecture, landscaping, and lighting to mitigate threats, such as using hedges, ditches, or limited building entrances.

AFOSH

Stands for Air Force Occupational Safety and Health; the program that covers safety practices within the Air Force.

DAFMAN 91-203

Air Force Occupational Safety, Fire and Health Standards; the publication outlining specific safety procedures for Communications–Electronics (C-E) work areas.

Psychological Factors (Safety)

Factors like unhealthy emotions, distractions, job knowledge, or feeling rushed that can lead to an unsafe attitude and negative worker performance.

Physical Factors (Safety)

Individual traits like fatigue, lack of sleep, strength limits, or the influence of medications and alcohol that can contribute to mishaps.

Organizational Factors (Safety)

Workplace conditions such as inadequate staffing, emphasis on production over safety, and lack of supervision that can lead to a disregard for safety protocols.

Bioenvironmental Engineering (BE)

The agency responsible for occupational and environmental health (OEH) risk assessments and identifying sources of health risks like noise and chemicals.

DANGER HIGH VOLTAGE

A sign or label indicating that the voltage in a specific area is equal to or greater than $600\,volts$.

Warning

A statement placed in documents or on equipment intended specifically for the protection of personnel.

Caution

A statement placed in documents or on equipment intended for the protection of equipment and property.

Common Sense

Defined in the context of safety as "normal intelligence" and the act of taking time to think.