awareness program on meter & house wiring

AWARENESS PROGRAMAWARENESS PROGRAM

ONON

METER & HOUSE METER & HOUSE WIRINGWIRING

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What is Electricity What is Electricity MeterMeter

A device to record Energy consumption.

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Meter Meter TerminologyTerminology

No load TestStarting CurrentCurrent RangeInfluence parameters

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Meter Type v/s Meter Type v/s RecordingRecording

• If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb• Current ……………… 38 Amp•Sr. No Rating Recording 1.0 2.5~5A ( Mech.) Read 15% 2.0 5A~10A ( Mech.) Read 26% 3.0 5A~20A (mech.) Read 53% 4.0 10~40A(Mech.) Read Okay 5.0 10~60A ( Elect.) Read Okay

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BSES Electronic BSES Electronic MetersMeters

SpecificationsSpecifications»Rating 10~60A»Starting 0.2%»Kwh and MD in KW»TOD, 6 Tariff and 6 time

zone»6 Month Billing data»RS232C»Transformer supply

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FAQFAQ

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

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FAQFAQ

• Why electronic meters are preferred

»Wide Range»Low starting current»Less effect of Influence parameters

»More accurate»Tamper proof

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ROLE OF LEDROLE OF LED

CAL LED

REV LED

N-CUT

EL

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ROLE OF LEDROLE OF LED

CAL LED

High resolution out put device for

meter checking

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ROLE OF LEDROLE OF LED

REV LED

* Indicates reverse flow of Energy

•Reasons *Incorrect wiring

*Use of un isolated *Generator/ Inverters

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ROLE OF LEDROLE OF LED

EL

•Due to ‘unbalanced’ Current.

• Needs Attention

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ROLE OF LEDROLE OF LED

N- Cut

•Indicates current without voltage on Meter

• Contact discom immediately

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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 KNOW ABOUT ELEL

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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 KNOW ABOUT ELEL

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Good electronic meters have Current sensors in both the

Phase path, and Neutral path

For Measurement, it chooses higher * of the two current.

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

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Electro-mechanical Meter has Current sensor only on one wire

All Measurement based on phase wire current even when connected to neutral.

All Measurement based on phase wire current even when connected to neutral.

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Good electronic meters have Current sensors in both the

Phase path, and Neutral path This is an advantage of electronic meters over electromechanical meters

This is an advantage of electronic meters over electromechanical meters

Never buy electronic meters without this featureNever buy electronic meters without this featureBut neutral looping may cause the meter

to “run extra”But neutral looping may cause the meter

to “run extra”

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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 KNOW ABOUT ELEL

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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX

METERMETERMCB / SwitchMCB / Switch

FuseFuse

Neutral

Phase

D. Box

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L

N

NORMAL CONNECTIONNORMAL CONNECTION

I red = I yellow

E mech= Eelect

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L

N

NORMAL CONNECTIONNORMAL CONNECTION

I red < I yellow

E mech< Eelect

JUMPER

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INPUT PHASE / NEUTRAL INPUT PHASE / NEUTRAL INTERCHANGEINTERCHANGE

NO EFFECTNO EFFECT

N

L

NO EFFECTNO EFFECT

I red = I yellow

E mech= Eelect

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NEUTRAL TOUCHING TO EARTHNEUTRAL TOUCHING TO EARTH

L

NNO EFFECTNO EFFECT

EL glow

I white < I red (EL on)Electronic = I red

Mechanical = I red

E mech= Eelect

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INTERCHANGE LINE & NEUTRALINTERCHANGE LINE & NEUTRALEARTH SHIFTINGEARTH SHIFTING

N

L

I red > I white (EL on)Electronic = I red

Mechanical = I white

Mechanical read less

EL glow

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INTERCHANGE LINE & NEUTRALINTERCHANGE LINE & NEUTRALEARTH SHIFTINGEARTH SHIFTING

N

L

I white = 0

I red > I white (EL on)Electronic = I red

Mechanical = Nil

Mechanical read Nil

EL glow

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ELECTRONIC METERELECTRONIC METERRECORD CORRECTLYRECORD CORRECTLY

L

N L

N

No Effect

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COMMON NEUTRALCOMMON NEUTRAL

L

N

L

N

Consumer B

Consumer A

Meter RecordingAs per Neutral

Current (Extra)

As perPhase

current(okay)

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COMMON NEUTRALCOMMON NEUTRAL

L

L

N

Consumer B

Consumer A

15A

15A

15A

15A

15A 15A

15A

5A

(15+5) A

10A

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COMMON NEUTRALCOMMON NEUTRAL

L

L

N

Consumer B

Consumer A

15A15A

15A

15A

15A 15A

15A

0.5A

14.5A

(15+0.5) A

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COMMON NEUTRALCOMMON NEUTRAL

L

L

N

Consumer B

Consumer A

15A15A

15A

15A

15A 15A

15A

5A

10A

(15+5) A

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L

N

L

N

INTERCONNECTED NEUTRALINTERCONNECTED NEUTRAL

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Wiring DefectWiring Defect

Type Of DefectsType Of Defects

Distribution Box Wiring

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DistributioDistribution Boxn Box

1.1. Use of DP- MCB/ IsolatorUse of DP- MCB/ Isolator2.2. Ensure ELCB.Ensure ELCB.3.3. For more than 10 Amp ckts. For more than 10 Amp ckts. Separate MCB.Separate MCB.4.4. Neutral Bus-bar.Neutral Bus-bar.5.5. Correct fuse & wire size.Correct fuse & wire size.

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MCB ELCB FUSE

Proper InstallationProper Installation

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Wiring DefectWiring Defect

Earth (No Neutral)

N-ECommon NCommon PCombination

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Wiring Wiring DefectDefect

Clamp on tester

Bulb tester Line tester Electrician Kit.

Tools

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Clamp on testerClamp on tester

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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX

METERMETERMCB / SwitchMCB / Switch

FuseFuse

Neutral

Phase

D. BoxGLOW

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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX

METERMETERMCB / SwitchMCB / Switch

FuseFuse

Neutral

Phase

D. BoxGLOW

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Wiring DefectWiring DefectStep-1.

If number of meters in one premise

is only one, then there is no common Neutral problem.

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Step-2. Load OnCheck I phase & I neutral

If I neutral = 0

Earth is used.

Phase

Neutral

METERMETER

EARTH

ELEL NENECommon Common NeutralNeutral

10A

0A

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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

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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.

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Phase

Neutral

EARTH

Phase

Neutral

EARTH

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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.

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Step-8.

Once Ckt. Identified then repairThe defect.

Step-9.

Once again check all current.

i.e. Ip = In

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HOUSE DISTRIBUTION HOUSE DISTRIBUTION BOXBOX

METERMETERMCB / SwitchMCB / Switch

FuseFuse

Neutral

Phase

D. BoxGLOW

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Typical Defect Typical Defect Pts.Pts.

Common Load. E.g. Motor

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

Common Invertors / Generator.

Houses with separate power & light meter.

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Typical Pts. Where Earth Typical Pts. Where Earth gets common with neutralgets common with neutral

Metallic body Appliances.

Appliances connected with metal pipe line.

Building RCC.

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!!Beware !!

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

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Thank Thank YouYou