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SOME IMPORTANT ELECTRICAL •
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PLC – PROGRA PROGRAMMA MMABLE BLE LOGIC CONTRO CONTROL L – Used for indu industria striall automation CT – COIL TRANSFORMER / CURRENT TRANSFORMER – Used to measure current PT – POWER TRANSFORMER – Used for stepping down voltage for either power or controlling purpose HT – HIGH TENSION – Used to mean High voltage lines (Above 11000 Volts) LT – LOW TENSION – Used to mean Low voltage lines (Below 11000 Volts)
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MCC – MOTOR CONTROL CENTER – Control panel of motors
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PCC – POWER CONTROL CENTER - Power feeders
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ECR – ELECTRICAL CONTROL ROOM
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CD – CONTROL DESK - Desk consisting of Push Buttons for doing remote operations VFD VFD – VARI VARIAB ABLE LE FR FREQ EQUE UENC NCY Y DRIV DRIVE E AC Dr Driv ives es us used ed fo for r controlling the speed of AC motors by varying the line frequency SMPS – SWITCHED MODE POWER SUPPLY – Used for supplying a regulated power output for sensitive devices such as the PLC, Cranes, Drives, etc. UPS – UNINTERRUPTED POWER SUPPLY – Used as a power backup for important electrical equipments and control units where an uninterrupted power supply is mandatory. FLC – FULL LOAD CURRENT – Ge Gene nera rall lly y in insc scri ribe bed d on th the e spec sp ecif ific icat atio ion n bo boar ard d of an any y el elec ectr tric ical al de devi vice ce in indi dica cati ting ng th the e maximum current taken on full load BDV – BR BREA EAK K DOWN DOWN VOLTA VOLTAGE GE – The max maximum imum with withstan standab dable le voltage of an insulator PF – POWER FACTOR – Cosine of the angle between voltage and current
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APFC – AUTOMATIC POWER FACTOR CORRECTION – An automated, integrated electrical circuit consisting of capacitor banks to improve the power factor of line. (Switching device used is Contactor) RTPFC – REAL TIME POWER FACTOR CORRECTON - An automated, integrated and fast switching electrical circuit consisting of capacitor banks to improve the power factor of line. (Switching device used is Thyristor) OLR – OVERLOAD RELAY – Used in electrical circuits as a protection against overcurrent. MCCB – MOULDED CASE CIRCUIT BREAKER – Circuit breakers generally above the rating of 63 Amps MCB – MINIATURE CIRCUIT BREAKER - Circuit breakers generally below the range of 63 Amps RCCB – RESIDUAL CURRENT CIRCUIT BREAKER – Used in cases where more human operations are involved. Senses even the minimum leakage current to earth and trips very fast ELCB – EARTH LEAKAGE CIRCUIT BREAKER – Same as RCCB ACB – AIR CIRCUIT BREAKER – Low Tension circuit breakers where the arc/surge neutralizer is air VCB – VACUUM CIRCUIT BREAKER – High Tension circuit breakers where the arc/surge neutralizer is vacuum OCB – OIL CIRCUIT BREAKER – High Tension circuit breakers where the arc/surge neutralizer is oil BOCB – BULK OIL CIRCUIT BREAKER – Same as OCB. Amount of oil used is more AAC – ALL ALUMINIUM CONDUCTOR – armoured aluminium cables
Common name for
DB – DISTRIBUTION BOX – Power distribution box JB – JUNCTION BOX TB – TERMINAL BOX
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LDB – LIGHTING DISTRIBUTION BOX
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SP MCB – SINGLE POLE MCB
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DP MCB – DOUBLE POLE MCB
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TP MCB – TRIPLE POLE MCB
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TPN MCB – TRIPLE POLE NEUTRAL MCB
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RC CIRCUIT – RESISTANCE CAPACITANCE CIRCUIT – Used as a harmonics filter
