Definition of Commonly Used F&G Acronyms and Abbreviations



F&G – Fire and Gas Detection System

AWG - American Wire Gauge: The American standard for designation of wire sizes. The smaller the wire size the bigger the gauge number. Wire Gauge 0000 to 40 AWG.

ASCII - American Standard Code for Information Interchange: A standardized alphanumeric character computer code.

CSA - Canadian Standards Association

DCS - Distributed Control System

DIP Switch – Dual Inline Package Switch: A group of two-position electrical contacts typically used to set unit addresses or function.

EEPROM - Electrically Erasable Programmable Read Only Memory: Nonvolatile, reprogrammable memory chip.

EH&S (HSE) – Environmental, Health and Safety (Health, Safety and Environmental)

FACP - Fire Alarm Control Panel: A central processing unit programmed to monitor fire detection equipment and to respond with appropriate response such as alarm.

GP - General Purpose Enclosure: An enclosure intended for indoor use in nonhazardous rated areas, primarily to prevent accidental contact of personnel with the enclosed equipment in areas where unusual service conditions do not exist.

 HVAC - Heating, Ventilating, and Air Conditioning: HVAC systems are used for climate control and pressurizing enclosures, shelters.

IDLH - Immediately Dangerous to Life and Health: The maximum concentration level of gas, in ppm, from which an individual could escape within 30 minutes without developing immediate, irreversible health effects.

IEEE - Institute of Electrical and Electronics Engineers 

IO -  Input/Output

IR -  Infrared: Refers to detection principles using the absorption in the spectrum of light

IS - Intrinsically Safe: A method of protection in which an explosion is prevented through an electrical design using energy storage devices in which the possibility of ignition is eliminated.

LC50 – Median Lethal Concentration to kill 50%: Standard measure of the toxicity of the surrounding medium that will kill half of the sample population of a specific test-animal in a specified period through exposure via inhalation. 

LCD - Liquid Crystal Display 

LD50 - Median Lethal Dose to kill 50%: The amount of an ingested substance that kills 50 percent of a test sample. 

LED - Light Emitting Diode: Typically used to indicate device status

LEL (LFL) - Lower Explosive (Flammable) Limit: The minimum concentration of a vapor, expressed in percentage, required to sustain a fire.

NEMA - National Electrical Manufacturers Association: An association that promotes the safe and effective design, installation and use of electrical and medical imaging products. Typical reference is NEMA enclosure ratings.

NFPA – United States National Fire Protection Agency

OSHA - United States Department of Labor Occupational Safety and Health Administration.

PEL - Permissible Exposure Limit: An airborne concentration of contaminants, in ppm, that most individuals can be exposed to repeatedly in a normal 8- hour day, in a 40-hour week, without adverse health effects. PEL levels are established by OSHA.

ppm - parts per million: A unit of measurement to depict gas concentrations at trace levels. 10,000 parts per million equals 1% by volume.

PLC - Programmable Logic Controller

RF - Radio Frequency: Electromagnetic radiation, typically above 20 kHz. Typically referenced in relation to interference with electronic equipment.

RAM: Random Access Memory

RH – Relative Humidity:  the ratio of the current absolute humidity to the highest possible absolute humidity.

ROM - Read Only Memory

RS-232 - A serial data communications format used for computer peripheral devices.

RS-485 - A differential communications format used for networks and interconnecting controllers.

UEL (UFL) - Upper Explosive (Flammable) Limit: the maximum concentration of a vapor, expressed in percentage, beyond which a fire cannot be sustained, because the concentration of oxygen would be insufficient to sustain the fire.

UL – Underwriter’s Laboratories 

UPS - Uninterruptible Power Supply: A battery powered system that provides standby power in the event of a main power disruption.

UV/VIS - Ultraviolet/visible: Refers to detection principles using the absorption in the spectrum of light

XP – Explosionproof: Method of protection in which an explosion in a hazardous location is prevented by containing any combustion within the device.