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  • Forum Abbreviation Glossary (multi-page) CLICK HERE TO SEE IT

    This thread is closed, so please PM SkipD and pass on any additional topics or other changes you would like to see in this glossary.






    Generac Generator-related Abbreviations:

    ATS - Automatic Transfer Switch - A panel with equipment to switch a load from utility power to generator power and back

    AVR - Automatic Voltage Regulator

    BCR - Battery Charge Rectifier

    CSS - Crank Shaft Sensor

    CWK - Cold Weather Kit - devices to keep the generator and its battery warmer in cold weather so it starts more easily.

    DPE - Displaced Phase Excitation - The generator's stator excitation (unregulated AC output) windings are referred to as DPE windings by Generac.

    GCU - Governor Control Unit

    HSB - Home Stand By - Description of generator purpose.

    LFP - Low Fuel Pressure switch

    LSM - Load Shed Module

    LOP - Low Oil Pressure switch

    N1 and N2 - These are the labels for utility voltage sense wires. They are connected to the 240 VAC utility feed in the transfer switch and to the generator. Existence of 240VAC between N1 and N2 in the generator "tells" the generator that utility power is present.

    PMA - Preventive Maintenance Agreement

    SMM - Smart Management Module - load shedding devices with wireless control communication.

    VR - Voltage Regulator


    Electrical and Electronic Abbreviations:

    AFCI - Arc Fault Circuit Interrupter

    CT - Current Transformer - A coil that goes around a wire and (along with an indicator) detects current flow in the wire.

    EEPROM - Electrically Erasable Programmable Read Only Memory - (also written E2PROM and pronounced "e-e-prom", "double-e-prom" or "e-squared-prom). A type of non-volatile memory used in computers and other electronic devices to store relatively small amounts of data but allowing individual bytes to be erased and reprogrammed.

    EGC - Equipment Grounding Conductor

    FLA - Full Load Amperes - The maximum current an HVAC compressor should draw under any operating conditions. This term was changed to "RLA (Rated Load Amps)" in 1976. See RLA below.

    GFCI - Ground Fault Circuit Interrupter

    LRA - Locked Rotor Amperes - The current that would flow through a motor if the rotor is not moving, usually much higher than the running current. This is also known as "starting inrush".

    MLCB - Main Line Circuit Breaker

    MWBC - Multi Wire Branch Circuit - A power run from a breaker box with two hots (one from each phase) and a single neutral return.

    NC - Normally Closed - The relay contact state when the contacts are touching ("made" or "closed") when the relay coil is de-energized.

    NO - Normally Open - The relay contact state when the contacts are NOT touching ("open") when the relay coil is de-energized.

    PCB - Printed Circuit Board

    RLA - Rated Load Amperes - The maximum current an HVAC compressor should draw under any operating conditions. This is frequently (but mistakenly) called Running Load Amps which leads people to believe, incorrectly, that this load is the normal working load. See FLA above.

    SE - "Service entrance" cable having a flame-retardant, moisture-resistant covering.

    SER - A "Service Entrance" cable which may be used in wet or dry above-ground applications. SER is a 4 wire cable with a insulated neutral wire and is used primarily for feeders.

    SEU - A "Service Entrance" cable which may be used in wet or dry above-ground applications. SEU cable is a 3 wire cable with the neutral being concentrically wound around the other conductors and is used primarily for service entrance.

    SPD - Surge Protector Device

    TDN - Time Delay Neutral - Device that provides a transition time from generator back to utility where the switch "holds" in the middle. This gives relays and contactors time to open for loads such as A/C units.

    UPS - Uninterruptable Power Supply - a device with a battery and an inverter which creates AC power almost instantly after the power feeding the device fails. The purpose is to power something like a computer which should not be disabled during a power failure.

    USE - "Service-entrance" cable, identified for underground use, having a moisture-resistant covering, but not required to have a flame-retardant covering.

    VD - Voltage Drop


    Fuel-Related Abbreviations:

    "WC - Inches of Water Column - a pressure measurement unit based on the height of a column of water. One pound per square inch equals roughly 27.7 "WC.

    AGA - American Gas Association

    CSST - Corrugated Stainless Steel Tubing - One type of tubing that is used to deliver fuel gas to a device.

    LP - Liquified Petroleum - A man-made gaseous fuel, typically called propane, made from petroleum and is commonly used to power standby generators.

    NG - Natural Gas - A naturally occurring gaseous fuel which is commonly used to power standby generators

    PSI - Pounds per Square Inch - A pressure measurement unit, typically measured with a gauge. Atmospheric pressure is roughly 14.7 PSI.

    WOG - Water Oil Gas - Rating for permitted use(s) of a valve. Valves used for fuel gas must have the "G" rating.


    Code-Related Abbreviations:

    AHJ - Authority Having Jurisdiction - The agency responsible for code compliance.

    CEC - Canadian Electrical Code - or CSA C22.1 is a standard published by the Canadian Standards Association pertaining to the installation and maintenance of electrical equipment in Canada.

    CMP - Code Making Panel

    CSA - Canadian Standards Association - is a not-for profit standards organization which develops standards in 57 areas, including the CEC.

    NEC - National Electrical Code - A standard published by the NFPA, as part of the National Fire Codes, pertaining to the installation and maintenance of electrical equipment in the U.S. The NEC is typically published with new revisions every three years (2008, 2011, 2014, for example).

    NFPA - National Fire Protection Agency - A United States trade association, albeit with some international members, that creates and maintains private, copyrighted, standards and codes for usage and adoption by local governments.

    SWRI - South West Research Institute - Alternate testing facility now used instead of UL on some of the new products.

    UL - Underwriters Laboratories - A laboratory located north of Chicago, IL, which assures the safety of electrical equipment products.
    - - Scroll down for Page 2 of the Forum Abbreviation Glossary. - -
    Last edited by SkipD; 2 weeks ago.
    Skip Douglas

  • #2
    Forum Abbreviation Glossary, page 2
    This thread is closed, so please PM SkipD and pass on any additional topics or other changes you would like to see in this glossary.


    Relay and Switch Contact Configuration Abbreviations:

    NC - Normally Closed - The relay contact state when the contacts are touching ("made" or "closed") when the relay coil is de-energized.

    NO - Normally Open - The relay contact state when the contacts are NOT touching ("open") when the relay coil is de-energized.

    SPST - Single Pole Single Throw - A single contact, either opened or closed by a change in the actuator position.

    SPDT - Single Pole Double Throw - A single set of contacts, including one common contact and both an open and a closed contact (called normally open and normally closed contacts in a relay). The common contact of a SPDT contact set can be connected to either the "NO" or "NC" contact by the actuator position.

    DPST - Double Pole Single Throw - Two sets of contacts, either open or closed, and connected to a common actuator. Both contact sets would be either open or closed simultaneously by a change in the actuator position.

    DPDT - Double Pole Double Throw - Two sets of contacts, each including one common contact and both an open and a closed contact (called normally open and normally closed contacts in a relay), and connected to a common actuator. The common contacts of both DPDT contact sets are simultaneously connected to either the "NO" or "NC" contacts by a change in the actuator position.

    NOTE - There are many more possible switch and relay contact configurations, but these four represent the basics. A relay or a toggle switch could just as easily have a 6PDT (6 pole, double throw) configuration, for example.


    Wire (Insulation) Type Abbreviations:

    THHN - Thermoplastic (usually PVC), High Heat resistant (90C rated), Nylon coated. - Good for "dry" locations only. THHN wire is often also labelled with THWN. Be careful of the temperature ratings, though.

    THWN - Thermoplastic (usually PVC), High heat resistant (75C rated), Water resistant, Nylon coated. - The added "W" stands for water resistant so that it could be installed outdoors and in conduit when THHN wire could not.

    THWN-2 - Thermoplastic (usually PVC), High heat resistant (90C rated), Water resistant, Nylon coated. - The added "W" stands for water resistant so that it could be installed outdoors and in conduit when THHN wire could not. Note the temperature rating difference between THWN and THWN-2.


    Generic Abbreviations:

    DIY - Do It Yourselfer

    FUBAR - Fouled Up Beyond All Recognition - A term frequently used in the US Military (with a slightly different first word ) meaning "It doesn't work".


    Generac Generator "Generations":

    The following info on the subject is from Chris Flagg of Ziller Electric:

    The Generac generator "model generations" seen in the Ziller Electric forums are sort of a forum slang. Chris doesn't think Generac ever really used these "generation" terms in any published material.

    "Gen 1" was from about 2000 to 2005 (4000 series units)

    "Gen 2" was from about 2006 to 2007 (5200 series, electronic governor, but no digital controller, still had square corners on the enclosure)

    "Gen 3" was from 2008 until about 2009 (5500 series, white rounded enclosure, digital controller screen except for the 8kW)

    "Gen 4" (5800 series) (2010-2012) or otherwise known as Nexus had the same appearance of Gen 3 but incorporated the Nexus controller. All units had digital screens and electronic governors. First units to incorporate output voltage monitoring and integrated voltage regulators and chargers into the panel.

    "Gen 5" (6000 series) would be what Chris would consider the Evolution products from 2013 to late 2016. New Evolution controller, upgrade-able firmware, first major changes to engine intake system.

    "Gen 6" (7000 series) Brand new in 2017 and current line (as of early 2018). Incorporates new all aluminum enclosure design, new wiring terminal blocks, removable end panel, integrated sediment trap, still Evolution controlled.

    That is a basic rundown of what Chris views as the different model lineup. There is technically a "Gen 0", which no one refers to as "Gen 1" since it was a VERY early design and there are very few left.

    Keep in mind that this "generation" info only pertains to the main residential Air Cooled Generac lineup and none of the oddball generators (EcoGen, PowerPact, CorePower, etc.).
    Last edited by SkipD; 2 weeks ago.
    Skip Douglas

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