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AWARENESS PROGRAM ON METER & HOUSE WIRING. What is Electricity Meter. A device to record Energy consumption. Meter Terminology. No load Test Starting Current Current Range Influence parameters. Meter Type v/s Recording. If Load is 2 AC, 1 Geyser, 1 Fridge, 1 TV, 20 bulb

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Awareness program on meter house wiring

AWARENESS PROGRAM ON METER & HOUSE WIRING


What is electricity meter

What is Electricity Meter

A device to record Energy consumption.


Meter terminology
Meter Terminology

No load Test

Starting Current

Current Range

Influence parameters


Meter type v s recording
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 2.5~5A ( 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


Bses electronic meters
BSES Electronic Meters

Specifications

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


FAQ

Why Mechanical meters read less

Influence Parameters

Age

Wear and Tear

Narrow Range

Mounting

Dust and Oil effect

Mechanical Counters


FAQ

Why electronic meters are preferred

Wide Range

Low starting current

Less effect of Influence parameters

More accurate

Tamper proof


Role of led
ROLE OF LED

N-CUT

CAL LED

EL

REV LED


Role of led1
ROLE OF LED

CAL LED

High resolution

out put device for

meter checking


Role of led2
ROLE OF LED

REV LED

  • * Indicates reverse flow of

  • Energy

  • Reasons

  • *Incorrect wiring

  • *Use of un isolated

  • *Generator/ Inverters


Role of led3
ROLE OF LED

EL

  • Due to ‘unbalanced’ Current.

  • Needs Attention


Role of led4
ROLE OF LED

N- Cut

  • Indicates current without

  • voltage on Meter

  • Contact discom

  • immediately


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.


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)


Good electronic meters have Current sensorsinboth 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 sensoronly on one wire

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


Good electronic meters have Current sensorsinboththe

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”


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.


HOUSE DISTRIBUTION BOX

METER

MCB / Switch

Fuse

Phase

Neutral

D. Box


NORMAL CONNECTION

I red = I yellow

E mech= Eelect


NORMAL CONNECTION

I red < I yellow

E mech< Eelect

JUMPER


INPUT PHASE / NEUTRAL

INTERCHANGE

I red = I yellow

E mech= Eelect

NO EFFECT

NO EFFECT


NEUTRAL TOUCHING TO EARTH

I white <I red (EL on)

Electronic = I red

Mechanical = I red

EL glow

E mech= Eelect

NO EFFECT


INTERCHANGE LINE & NEUTRAL

EARTH SHIFTING

EL glow

I red>I white (EL on)

Electronic = I red

Mechanical = I white

Mechanical read less


INTERCHANGE LINE & NEUTRAL

EARTH SHIFTING

I white = 0

EL glow

I red>I white (EL on)

Electronic = I red

Mechanical = Nil

Mechanical read Nil


ELECTRONIC METER

RECORD CORRECTLY

No Effect


COMMON NEUTRAL

Meter Recording

As per

Neutral

Current (Extra)

As per

Phase

current

(okay)


COMMON NEUTRAL

15A

15A

15A

(15+5) A

15A

5A

15A

15A

15A

10A


COMMON NEUTRAL

15A

15A

15A

14.5A

15A

0.5A

15A

15A

15A

(15+0.5) A


COMMON NEUTRAL

15A

15A

15A

10A

15A

5A

15A

15A

15A

(15+5) A



Wiring defect
Wiring Defect

Type Of Defects

Distribution Box

Wiring


Distribution Box

  • Use of DP- MCB/ Isolator

  • Ensure ELCB.

  • For more than 10 Amp ckts.

  • Separate MCB.

  • Neutral Bus-bar.

  • Correct fuse & wire size.


ELCB

FUSE

MCB

Proper Installation


Wiring defect1
Wiring Defect

  • Earth (No Neutral)

  • N-E

  • Common N

  • Common P

  • Combination


  • Wiring defect2
    Wiring Defect

    Tools

    • Clamp on tester

  • Bulb tester

  • Line tester

  • Electrician Kit.



  • HOUSE DISTRIBUTION BOX

    METER

    MCB / Switch

    Fuse

    Phase

    Neutral

    D. Box

    GLOW


    HOUSE DISTRIBUTION BOX

    METER

    MCB / Switch

    Fuse

    Phase

    Neutral

    D. Box

    GLOW


    Wiring defect3
    Wiring Defect

    Step-1.

    If number of meters in one premise

    is only one, then there is

    no common Neutral problem.


    Step-2.

    Load On

    Check I phase & I neutral

    If I neutral = 0

    Earth is used.

    METER

    Phase

    10A

    Neutral

    0A

    EARTH

    Common

    Neutral

    EL

    NE


    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 Off

    Means Neutral-Earth Problem.

    Step-5.

    If neighbour Phase Off

    Then EL Off ,

    Means Common wire.


    Phase

    Neutral

    EARTH

    Phase

    Neutral

    EARTH


    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.


    Step-8.

    Once Ckt. Identified then repair

    The defect.

    Step-9.

    Once again check all current.

    i.e. Ip = In


    HOUSE DISTRIBUTION BOX

    METER

    MCB / Switch

    Fuse

    Phase

    Neutral

    D. Box

    GLOW


    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 neutral

    Metallic body Appliances.

    Appliances connected with metal pipe line.

    Building RCC.


    !!Beware!!

    Meter can only be touch by

    Discom (BSES) employee.



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