PROTECTIVE DEVICE AND COORDINATION SETTINGS Frame ............................ This is how large of a trip unit a circuit breaker can accommodate. Sensor ...........................Amperage size of the trip unit or if the breaker does not have a trip unit, the amperage size of the circuit breaker. PD (OCPD) .....................An abbreviation for (Over Current) Protective Device. This includes relays, circuit breakers, and fuses. PD Settings.................... Settings on the breakers that adjust the tripping characteristics.
LTPU ................. Long Time Pickup LTD ................... Long Time Delay STPU................. Short Time Pickup STD ................... Short Time Delay INST .................. Instantaneous
INST D............... Instantaneous Delay GFPU ................ Ground Fault Pickup GFD .................. Ground Fault Delay TCC ................................Time Current Curve - Graph that is used to evaluate the coordination between breakers, protection of equipment, and motor starting. EQUIPMENT ABBREVIATIONS ATS ................................ Automatic Transfer Switch CAP................................ Capacitor Bank or Auto-Switching Capacitor Bank CB .................................. Circuit Breaker CBL ................................ Cable DCBL..............................Dummy Cable - Used occasionally in the model where there is no physical separation, but two separate calculations are required. Most commonly used for line/load side calculations. DISC ............................... Disconnect ENC................................ Enclosure MCB...............................Main Circuit Breaker (commonly used for Motor Control Centers and Switchboards) MCC............................... Motor Control Center PNL ................................ Panelboard
RLY ................................ Relay SW ................................. Switch
SWBD ............................ Switchboard SWGR ............................ Switchgear TS .................................. Transfer Switch XFMR ............................. Transformer
SITE NAME ARC FLASH STUDY
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