9ROLE OF LEDCAL LEDHigh resolutionout put device formeter checking
10* Indicates reverse flow of *Generator/ Inverters ROLE OF LEDREV LED* Indicates reverse flow ofEnergyReasons*Incorrect wiring*Use of un isolated*Generator/ Inverters
11Due to ‘unbalanced’ Current. ROLE OF LEDELDue to ‘unbalanced’ Current.Needs Attention
12Indicates current without ROLE OF LEDN- CutIndicates current withoutvoltage on MeterContact discomimmediately
13KNOW ABOUT EL 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 withphase / neutral wire of the neighbourNeutral wire is interconnected with theneighbors neutral wire.
14Wrong wiring, among others things can result in: KNOW ABOUT ELWrong 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)
15* In general Phase, current is used for measurement. However Good electronic meters have Current sensors in both thePhase path, and Neutral pathFor Measurement, it chooses higher * of the two current.* In general Phase, current is used for measurement. Howeverif neutral Current varies by more than 10~ 12 % then Neutralcurrent selected
16Electro-mechanical Meter has Current sensor only on one wire All Measurement based on phase wire current even when connected to neutral.
17But neutral looping may cause the meter to “run extra” Good electronic meters have Current sensors in both thePhase path, and Neutral pathThis is an advantage of electronic meters over electromechanical metersNever buy electronic meters without this featureBut neutral looping may cause the meter to “run extra”
18KNOW ABOUT ELIf 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 greatimportance and consumers are advised not toignore its usefulness.
19HOUSE DISTRIBUTION BOX METERMCB / SwitchFusePhaseNeutralD. Box
20I red = I yellow E mech= Eelect NORMAL CONNECTIONI red = I yellowE mech= Eelect
21I red < I yellow E mech< Eelect NORMAL CONNECTIONI red < I yellowE mech< EelectJUMPER
22I red = I yellow E mech= Eelect INPUT PHASE / NEUTRALINTERCHANGEI red = I yellowE mech= EelectNO EFFECTNO EFFECT
23NEUTRAL TOUCHING TO EARTH I white < I red (EL on) Electronic = I redMechanical = I redEL glowE mech= EelectNO EFFECT
24INTERCHANGE LINE & NEUTRAL I red > I white (EL on) EARTH SHIFTINGEL glowI red > I white (EL on)Electronic = I redMechanical = I whiteMechanical read less
25INTERCHANGE LINE & NEUTRAL I red > I white (EL on) EARTH SHIFTINGI white = 0EL glowI red > I white (EL on)Electronic = I redMechanical = NilMechanical read Nil