AWARENESS PROGRAM ON METER

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AWARENESS PROGRAM ON METER HOUSE WIRING
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What is Electricity Meter

• A device to record Energy consumption.

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Meter Terminology

• No load Test
• Starting Current
• Current Range
• Influence parameters

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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 2.55A ( Mech.) Read 15
• 2.0 5A10A ( Mech.) Read 26
• 3.0 5A20A (mech.) Read 53
• 4.0 1040A(Mech.) Read Okay
• 5.0 1060A ( Elect.) Read Okay

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BSES Electronic Meters

• Specifications
• Rating 1060A
• 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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FAQ

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

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FAQ

• 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 LED
N-CUT
CAL LED
EL
REV LED
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ROLE OF LED
CAL LED
High resolution out put device for meter
checking
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ROLE OF LED
REV LED

• Indicates reverse flow of
• Energy
• Reasons
• Incorrect wiring
• Use of un isolated
• Generator/ Inverters

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ROLE OF LED
EL

• Due to unbalanced Current.
• Needs Attention

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ROLE OF LED
N- Cut

• Indicates current without
• voltage on Meter
• Contact discom
• immediately

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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.
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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)

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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.
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.
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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
Never buy electronic meters without this feature
But neutral looping may cause the meter to run
extra
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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.
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HOUSE DISTRIBUTION BOX
METER
MCB / Switch
Fuse
Phase
Neutral
D. Box
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NORMAL CONNECTION
I red I yellow
E mech Eelect
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NORMAL CONNECTION
I red lt I yellow
E mechlt Eelect
JUMPER
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INPUT PHASE / NEUTRAL INTERCHANGE
I red I yellow
E mech Eelect
NO EFFECT
NO EFFECT
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NEUTRAL TOUCHING TO EARTH
I white lt I red (EL on) Electronic I
red Mechanical I red
EL glow
E mech Eelect
NO EFFECT
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INTERCHANGE LINE NEUTRAL EARTH SHIFTING
EL glow
I red gt I white (EL on) Electronic I
red Mechanical I white
Mechanical read less
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INTERCHANGE LINE NEUTRAL EARTH SHIFTING
I white 0
EL glow
I red gt I white (EL on) Electronic I
red Mechanical Nil
Mechanical read Nil
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ELECTRONIC METER RECORD CORRECTLY
No Effect
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COMMON NEUTRAL
Meter Recording As per Neutral Current (Extra)
As per Phase current (okay)
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COMMON NEUTRAL
15A
15A
15A
(155) A
15A
5A
15A
15A
15A
10A
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COMMON NEUTRAL
15A
15A
15A
14.5A
15A
0.5A
15A
15A
15A
(150.5) A
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COMMON NEUTRAL
15A
15A
15A
10A
15A
5A
15A
15A
15A
(155) A
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INTERCONNECTED NEUTRAL
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Wiring Defect

• Type Of Defects
• Distribution Box
• Wiring

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Distribution Box

• Use of DP- MCB/ Isolator
• Ensure ELCB.
• For more than 10 Amp ckts.
• Separate MCB.
• Neutral Bus-bar.
• Correct fuse wire size.

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ELCB
FUSE
MCB
Proper Installation
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Wiring Defect
Earth (No Neutral) N-E Common N Common
P Combination
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Wiring Defect
Tools
Clamp on tester Bulb tester Line
tester Electrician Kit.
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Clamp on tester
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HOUSE DISTRIBUTION BOX
METER
MCB / Switch
Fuse
Phase
Neutral
D. Box
GLOW
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HOUSE DISTRIBUTION BOX
METER
MCB / Switch
Fuse
Phase
Neutral
D. Box
GLOW
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Wiring Defect
Step-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 On
Check I phase I neutral If I neutral 0 Earth
is used.
METER
Phase
10A
Neutral
0A
EARTH
Common Neutral
EL
NE
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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 Off Means
Neutral-Earth Problem.
Step-5.
If neighbour Phase Off Then 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 Neutral
Step-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 repair The defect.
Step-9.
Once again check all current. i.e. Ip In
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HOUSE DISTRIBUTION BOX
METER
MCB / Switch
Fuse
Phase
Neutral
D. Box
GLOW
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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.
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Typical Pts. Where Earth gets 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 You