AWARENESS PROGRAM ON METER HOUSE WIRING What is

AWARENESS PROGRAM ON METER & HOUSE WIRING

What is Electricity Meter A device to record Energy consumption. 2

Meter Terminology No load Test Starting Current Range Influence parameters 3

Meter Type v/s Recording • If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb • Current ……………… 38 Amp • Sr. No Rating Recording 1. 0 2. 5~5 A ( Mech. ) Read 15% 2. 0 5 A~10 A ( Mech. ) Read 26% 3. 0 5 A~20 A (mech. ) Read 53% 4. 0 10~40 A(Mech. ) Read Okay 5. 0 10~60 A ( Elect. ) Read Okay 4

BSES Electronic Meters Specifications » Rating 10~60 A » Starting 0. 2% » Kwh and MD in KW » TOD, 6 Tariff and 6 time zone » 6 Month Billing data » RS 232 C » Transformer supply 5

FAQ Why Mechanical meters read less » Influence Parameters » Age » Wear and Tear » Narrow Range » Mounting » Dust and Oil effect » Mechanical Counters 6

FAQ • Why electronic meters are preferred » Wide Range » Low starting current » Less effect of Influence parameters » More accurate » Tamper proof 7

ROLE OF LED N-CUT CAL LED EL REV LED 8

ROLE OF LED CAL LED High resolution out put device for meter checking 9

ROLE OF LED REV LED * Indicates reverse flow of Energy • Reasons *Incorrect wiring *Use of un isolated *Generator/ Inverters 10

ROLE OF LED EL • Due to ‘unbalanced’ Current • Needs Attention 11

ROLE OF LED N- Cut • Indicates current without voltage on Meter • Contact discom immediately 12

KNOW 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 with phase / neutral wire of the neighbour Neutral wire is interconnected with the neighbors neutral wire. 13

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 can flow through your meter) 14 current

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 15

Electro-mechanical Meter has Current sensor only on one wire All Measurement based on phase wire current even when connected to neutral. 16

Good electronic meters have Current sensors in both the Phase path, and Neutral path This is an advantage of electronic meters over electromechanical meters Never buy electronic meters without this feature But neutral looping may cause the meter to “run extra” 17

KNOW ABOUT EL 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. 18

HOUSE DISTRIBUTION BOX METER Fuse MCB / Switch Phase Neutral D. Box 19

NORMAL CONNECTION I =I red E 20 mech yellow =E elect

NORMAL CONNECTION I <I red E JUMPER 21 mech < yellow E elect

INPUT PHASE / NEUTRAL INTERCHANGE I =I red E mech yellow =E elect NO EFFECT 22

NEUTRAL TOUCHING TO EARTH I EL glow < I red (EL on) Electronic = I red Mechanical = I red white E mech =E elect NO EFFECT 23

INTERCHANGE LINE & NEUTRAL EARTH SHIFTING EL glow I red > I white (EL on) Electronic = I red Mechanical = I white Mechanical read less 24

INTERCHANGE LINE & NEUTRAL EARTH SHIFTING I EL glow white = 0 I red > I white (EL on) Electronic = I red Mechanical = Nil Mechanical read Nil 25

ELECTRONIC METER RECORD CORRECTLY No Effect 26

COMMON NEUTRAL Meter Recording As per Neutral Current (Extra) As per Phase current (okay) 27

COMMON NEUTRAL 15 A 15 A (15+5) A 15 A 5 A 15 A 10 A 28

COMMON NEUTRAL 15 A 15 A 14. 5 A 15 A 0. 5 A 15 A 15 A (15+0. 5) A 29

COMMON NEUTRAL 15 A 15 A 10 A 15 A 5 A 15 A 15 A (15+5) A 30

INTERCONNECTED NEUTRAL 31

Wiring Defect Type Of Defects Distribution Box Wiring 32

Distribution Box 1. Use of DP- MCB/ Isolator 2. Ensure ELCB. 3. For more than 10 Amp ckts. Separate MCB. 4. Neutral Bus-bar. 5. Correct fuse & wire size. 33

ELCB MCB FUSE Proper Installation 34

Wiring Defect Earth (No Neutral) N-E Common N Common P Combination 35

Wiring Defect Tools Clamp on tester Bulb tester Line tester Electrician Kit. 36

Clamp on tester 37

HOUSE DISTRIBUTION BOX METER Fuse MCB / Switch Phase Neutral D. Box GLOW 38

HOUSE DISTRIBUTION BOX METER Fuse MCB / Switch Phase Neutral D. Box GLOW 39

Wiring Defect Step-1. If number of meters in one premise is only one, then there is no common Neutral problem. 40

Step-2. Load On Check I phase &I neutral If I neutral = 0 Earth is used. METER Phase 10 A Neutral 0 A EARTH EL NE 41 Common Neutral

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 42

Step-4. At MCB If Phase is Off, then EL Off Means Neutral-Earth Problem. Step-5. If neighbour Phase Off Then EL Off , Means Common wire. 43

Phase Neutral EARTH 44

Step-6. If V EN ≠ 0 Then Earth not touching Neutral Step-7. If common wire Disconnect one by one Neutral Ckt. From Bus-bar & see if EL off. 45

Step-8. Once Ckt. Identified then repair The defect. Step-9. Once again check all current. i. e. 46 Ip = In

HOUSE DISTRIBUTION BOX METER Fuse MCB / Switch Phase Neutral D. Box GLOW 47

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. 48

Typical Pts. Where Earth gets common with neutral Metallic body Appliances connected with metal pipe line. Building RCC. 49

!!Beware !! Meter can only be touch by Discom (BSES) employee. 50

Thank You 51