AWARENESS PROGRAM

ON

METER & HOUSE WIRING

*What is Electricity Meter

A device to record Energy consumption.

*Meter TerminologyNo load TestStarting CurrentCurrent RangeInfluence parameters

*Meter Type v/s Recording If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb Current 38 AmpSr. No Rating Recording 1.02.5~5A ( Mech.) Read 15% 2.05A~10A ( Mech.) Read 26% 3.0 5A~20A (mech.) Read 53% 4.010~40A(Mech.) Read Okay 5.010~60A ( Elect.) Read Okay

*BSES Electronic MetersSpecificationsRating 10~60AStarting 0.2%Kwh and MD in KWTOD, 6 Tariff and 6 time zone6 Month Billing dataRS232CTransformer supply

*FAQWhy Mechanical meters read lessInfluence ParametersAgeWear and TearNarrow RangeMountingDust and Oil effectMechanical Counters

*FAQWhy electronic meters are preferredWide RangeLow starting currentLess effect of Influence parametersMore accurateTamper proof

*ROLE OF LEDCAL LEDREV LEDN-CUTEL

*ROLE OF LEDCAL LEDHigh resolution out put device for meter checking

*ROLE OF LEDREV LED* Indicates reverse flow of EnergyReasons *Incorrect wiring *Use of un isolated *Generator/ Inverters

*ROLE OF LEDELDue to unbalanced Current.

Needs Attention

*ROLE OF LEDN- CutIndicates current without voltage on Meter

Contact discom immediately

* The glowing of the EL LED indicates the following:

Earth is being used as neutral.

Neutral is touching the earth.

Phase / Neutral wire is touching with phase / neutral wire of the neighbour

Neutral wire is interconnected with the neighbors neutral wire.

KNOW ABOUT EL

*Wrong wiring, among others things can result in: Safety hazards (wires are still live, even when the main switch is off).

Cause fire (if by mistake, phase and neutral wires get interchanged)

Wrong Current flow (neighbours current can flow through your meter)

KNOW ABOUT EL

*Good electronic meters have Current sensors in both the Phase path, and Neutral path For Measurement, it chooses higher * of the two current.

* In general Phase, current is used for measurement. However if neutral Current varies by more than 10~ 12 % then Neutral current selected

*Electro-mechanical Meter has Current sensor only on one wireAll Measurement based on phase wire current even when connected to neutral.

*Good electronic meters have Current sensors in both thePhase path, and Neutral path This is an advantage of electronic meters over electromechanical metersNever buy electronic meters without this featureBut neutral looping may cause the meter to run extra

*If EL is glowing, get your internal wiring checked for any leakages and other problems and also carefully look at the EL LED in the Electronic Meters. EL LED, in Electronic Meters, however small, is of great importance and consumers are advised not to ignore its usefulness.KNOW ABOUT EL

*HOUSE DISTRIBUTION BOXMETERMCB / SwitchFuseNeutralPhaseD. Box

*NORMAL CONNECTIONI red = I yellowE mech= Eelect

*NORMAL CONNECTIONI red < I yellowE mech< EelectJUMPER

*INPUT PHASE / NEUTRAL INTERCHANGENO EFFECTNO EFFECTI red = I yellowE mech= Eelect

*NEUTRAL TOUCHING TO EARTHNO EFFECTEL glowI white < I red (EL on)Electronic = I redMechanical = I redE mech= Eelect

*INTERCHANGE LINE & NEUTRALEARTH SHIFTINGI red > I white (EL on)Electronic = I redMechanical = I whiteMechanical read lessEL glow

*INTERCHANGE LINE & NEUTRALEARTH SHIFTINGI white = 0 I red > I white (EL on)Electronic = I redMechanical = NilMechanical read NilEL glow

*ELECTRONIC METERRECORD CORRECTLYNo Effect

*COMMON NEUTRALMeter RecordingAs per NeutralCurrent (Extra) As perPhase current(okay)

*COMMON NEUTRAL15A15A15A15A15A15A15A5A(15+5) A10A

*COMMON NEUTRAL15A15A15A15A15A15A15A0.5A14.5A(15+0.5) A

*COMMON NEUTRAL15A15A15A15A15A15A15A5A10A(15+5) A

*INTERCONNECTED NEUTRAL

*Wiring DefectType Of Defects

Distribution Box Wiring

*Distribution BoxUse of DP- MCB/ IsolatorEnsure ELCB.For more than 10 Amp ckts. Separate MCB.Neutral Bus-bar.Correct fuse & wire size.

*MCBELCBFUSEProper Installation

*Wiring DefectEarth (No Neutral)N-ECommon NCommon PCombination

*Wiring DefectClamp on tester Bulb tester Line tester Electrician Kit.Tools

*Clamp on tester

*HOUSE DISTRIBUTION BOXMETERMCB / SwitchFuseNeutralPhaseD. BoxGLOW

*HOUSE DISTRIBUTION BOXMETERMCB / SwitchFuseNeutralPhaseD. BoxGLOW

*Wiring DefectStep-1.If number of meters in one premise is only one, then there is no common Neutral problem.

*Step-2.Load OnCheck I phase & I neutralIf I neutral = 0Earth is used.PhaseNeutralMETEREARTHELNECommon Neutral10A0A

*Step-3.If Neutral removed from MCB is still load working, then it is a wiring problem.

If the total MCB is off and the load is still working, then both wire are being shared

*Step-4.At MCB

If Phase is Off, then EL OffMeans Neutral-Earth Problem.Step-5.If neighbour Phase OffThen EL Off , Means Common wire.

*PhaseNeutralEARTHPhaseNeutralEARTH

*Step-6.If V EN 0

Then Earth not touching NeutralStep-7.If common wire

Disconnect one by one Neutral Ckt. From Bus-bar & see if EL off.

*Step-8.Once Ckt. Identified then repairThe defect.Step-9.Once again check all current.i.e. Ip = In

*HOUSE DISTRIBUTION BOXMETERMCB / SwitchFuseNeutralPhaseD. BoxGLOW

*Typical Defect Pts.Common Load. E.g. Motor

Stair Case Light (i.e. two way switch.

Common Invertors / Generator.

Houses with separate power & light meter.

*Typical Pts. Where Earth gets common with neutralMetallic body Appliances.Appliances connected with metal pipe line.Building RCC.

*!!Beware !!

Meter can only be touch by Discom (BSES) employee.

*Thank You