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February 28th , 2013
Models beginning with MO, MK, 7B, 6S, 6F or 5B
The Mini Meter™
Product Description
Technical Specifications
Installation Instructions
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Mini Meter Installation Manual
1. Product Description .................................................................................................................................2
1.1 General Description……...........................................................................................................2
1.2 Meter Features...........................................................................................................................2
1.3 Meter Certifications ..................................................................................................................3
1.4 Physical Description .................................................................................................................3
1.4.1 Single Meter..............................................................................................................3
1.4.2 Enclosures.................................................................................................................4
2. Technical Specifications ..........................................................................................................................5
2.1 Electrical Specifications…........................................................................................................6
2.3 Input/Output Connections.........................................................................................................6
Display Specifications.......................................................................................................7
General Display Information ..................................................................................7
3. Installation Instructions............................................................................................................................8
3.1 Explanation of Warning Symbols ............................................................................................8
3.2 Safety Precautions.....................................................................................................................8
3.3 Preparation ................................................................................................................................9
3.4 List of Materials....................................................................................................................... .9
3.5 Mounting the Enclosure .......................................................................................................... .9
3.5.1 Mounting Location ...................................................................................................9
3.5.2 Drilling Conduit Holes............................................................................................ 10
3.5.3 Mounting Procedure and Conduit Installation.........................................................10
3.6 Installation of Voltage Lines................................................................................................... 11
3.7 Variations and Installation of Current Transformers ............................................................ .11
General Requirements...................................................................................................... 12
3.8 Testing the Installation.............................................................................................................14
4. Maintenance............................................................................................................................................ 15
5. Troubleshooting/FAQ..............................................................................................................................15
6. Contact Information.................................................................................................................................16
Leviton Manufacturing Co., Inc. 1 Contents
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List of Figures
Figure 1: Single Mini Meter and Epoxy Encapsulated Module......................................................... 3
Figure 2: Small Enclosure Outline and Mounting Dimensions......................................................... 4
Figure 3: Mini Meter Connections and Display................................................................................ 6
Figure 4: Mounting the Enclosure ……........................................................................................... 10
List of Tables
Table 1: Electrical and Environmental Specifications....................................................................... 5
Table 2: I/O connections.....................................................................................................................7
Table 3: LED Display Indicators........................................................................................................7
1. Product Description
1.1 General Description
The Leviton Mini Meter™ is a self-powered, current transformer (CT) rated
electronic kilowatthour (kWh) meter designed for permanent connection to an
electrical service. Mini Meters come in single element (2-wire) and dual element (3wire) configurations.
1.2 Meter Features
Revenue-grade accuracy with solid-core or easy to install split core CTs
Built in LCD that display or external mechanical counter
Encapsulated model for harsh environments (Model Number prefixes 5B)
Multiple load monitoring with a single meter
AMR compatible isolated pulse outputs
Reverse-phase LED indicator
5-year warranty
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1.3 Meter Certifications
UL Recognized Component for us in US or Canada
Conforms to accuracy requirements set forth in ANSI C12.10
Certified to California Division of Measurement Standards
Approved by the California Energy Commission for use in California Solar
1.4 Physical Description
1.4.1 Single Meter
Figure 1 below shows the dimensions of a single Mini Meter or Epoxy
Encapsulated case and cover.
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1.4.2 Enclosures
Mini Meter and Epoxy Encapsulated module enclosures mounting drawings are
shown below in figure 2.
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2. Technical Specifications
2.1 Electrical Specifications
Mini Meters and Epoxy Encapsulated Modules fall under UL Circuit Category III: a
device for measurements performed in the building installation. The electrical
specifications for Mini Meters are given in the table below.
Input Configurations 1 Phase, 2 wire
1 or 2 Phase, 3 wire
Supply Voltage Range Min. 102 VAC
(L1 or L2 to Neutral) Max. 138 VAC
Maximum Input Power, L1 and L2 8 VA
Maximum Rated Current1 440 A primary for 400 A models
220 A primary for 200 A models
110 A primary for 100 A models
0.11 A secondary for 0.1 A secondary models
0.22 A secondary for 0.2 A secondary models
Line Frequency 50-60 Hz
Power Factor Range 0.5 to 1.0, leading or lagging
Accuracy +/- 0.5% of registration @ 1.0pf. 2 to 200 A
+/- 0.75% of registration @ 0.5pf, 2 to 200 A
Operating Temperature Range -30 to +60 degrees C
Rated Pollution Degree2 2
Rated Relative Humidity 80%
Terminal Blocks:
Dinkle/International Connector 4.4 in-lb of torque maximum
EK508-11P or equiv.
1Product approved for use with included Leviton Current Transformers, as follows:
400A
200A
100A
2Pollution Degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by
condensation must be expected.
Table 1: Electrical and environmental specifications
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Figure 3: Mini Meter connections and display
Power LED
Load LED
Optional LCD
Reverse Phase
Sealing Studs
2.2 Input/Output Connections and User Display
Display area
LED
Voltage Inputs (wire connections) Description
L1 Black wire, voltage input, Line 1,
120V with respect to neutral
N White wire, Neutral input
L2 Red wire, voltage input, Line 2, 120V
with respect to neutral (7B and 5B
models only)
CT Inputs
CT1 : X1 Current Transformer input, CT1.
Colored wire of CT 1
CT1 : X2 Current Transformer input, CT1. White
wire of CT1
CT2 : X1 Current Transformer input, CT2.Colored
wire of CT2 (7B and 5B models only)
CT2 : X2 Current Transformer input, CT2. White
wire of CT2 (7B and 5B models only)
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Outputs
10, Isolated Output (10 Wh/P, Kh = 10) Isolated pulse output: 5 watthours on, 5
watthours off, referenced to ISOL COM
NOT TO BE USED FOR FIELD WIRING
100, Isolated Output (100 Wh/P, Kh=100) Isolated pulse output: 50 watthours on, 50
watthours off, referenced to ISOL COM
1000, Isolated Output (1 kWh/P, Kh=1000) Isolated pulse output: 500 watthours on, 500
watthours off, referenced to ISOL COM (not
available on models with T suffix)
ISOL COM Isolated common for 10/100/1000 isolated
outputs
Counter (kh = 100 or kh = 1000)* For 12 VDC electro-mechanical counter
Counter (kh = 100 or kh = 1000)* For 12 VDC electro-mechanical counter
+12 VDC 12 VDC output; current rating is 3 mA max.
(MMS and MMD models only)
Table 2: I/O connections
*Recommend Leviton mechanical counter (1 kWh models), (0.1 kWh models), or equivalents
LED Indicators Description
Power LED (green) Illuminates when the meter is supplied with proper voltage
Load LED (green) 50% duty cycle (at constant load) LED to verify proper
meter function when connected to a load. At 200 watts,
LED will illuminate for 1.5 minutes, then turn off for 1.5
minutes; with no load, LED will remain on or off
Reverse Phase LED (red) Illuminates when a problem with meter phasing exists.
With no load, LED may be on or off. See CT installation
section for instructions.
LCD Display Optional LCD display that shows total kWh
Table 3: Display indicators
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Indicates the need to consult the operation manual due
to the presence of a potential risk.
Indicates the presence of electric shock hazards. Prior
to proceeding, de-energize the circuit and consult the
operation manual.
WARNING
Installation of electric meters requires working with possibly hazardous
voltages. These instructions are meant to be a supplement to aid
trained, qualified professionals.
Turn off all power supplying the equipment before performing any wiring
operations. Use a properly rated voltage sensing device to confirm
power is off.
Bonding is not automatic for metal conduit connections; separate
bonding is to be provided.
Installations should be done in accordance with local codes and current
National Electric Code requirements.
Equipment used in a manner not specified by this document impairs the
protection provided by the equipment.
Failure to follow these warnings could result in serious injury or death.
3. Installation Instructions
The following section contains installation and wiring instructions for the Leviton Mini
Meter™. If technical assistance is required at any point during the installation, contact
information can be found at the end of this manual. Leviton is not responsible for
damage to the meter caused by incorrect wiring.
3.1. Explanation of Warning Symbols
3.2 Safety Precautions
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3.3 Preparation
1. Verify the model number and electrical specifications of the device being installed
to confirm they are appropriate for the intended electrical service (see Section 2).
2. Consult local codes for any possible permits or inspections required before
beginning electrical work.
3. Ensure the conduit for the installation is flexible and non-metallic. For outdoor
applications conduit and conduit fittings must be rated for UL Type 4x outdoor
enclosures. Failure to use the appropriate conduit impairs the degree of equipment
protection.
4. Make sure all tools to be used during installation have proper insulation ratings.
5. Look at the Meter and inside the electrical panel for possible exposed wire, broken
wire, damaged components or loose connections.
3.4 List of Materials
Mini Meter or Epoxy Encapsulated Module small enclosure and associated mounting
material.
Line 1, Line 2, and Neutral hook-up wires as needed for the electrical service.
Wires must be 18 AWG or larger and insulated for 300 VAC min.
Current Transformers (CTs): This product is designed for use with Leviton CTs
Flexible, non-metallic conduit and fittings; UL Type 4X for outdoor applications.
3.5 Mounting the Enclosure
3.5.1 Selecting a Mounting Location
Meter installations require a switch or circuit breaker as part of the building
installation.
The switch or circuit breaker must be marked as the disconnecting device for
the meter.
It is recommended that the enclosure be mounted near the disconnecting
device in an area with adequate ventilation.
The enclosure should not be positioned in a manner that makes it difficult to
operate the disconnecting device.
Ensure that the CT and voltage lead lengths (and conduit lengths) are capable
of reaching the enclosure from the load center.
If a suitable mounting location near the load center cannot be found, additional
in-line fuses or circuit breaker may be required in accordance with NEC regulations.
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3.5.2 Drilling Conduit Holes
The bottom panel and lower half of the side panels work best for conduit opening
locations in outdoor single meter enclosures. Select the location the makes wire
installation easiest for the given environment. If the side panels are used, holes
should be centered approximately half an inch from the bottom of the enclosure.
Hole sizes must be appropriate to fittings, and large enough to fit all voltage and
CT wiring (4-7 18 AWG min. wires insulated for 300 V min.). Care should be
exercised to keep drill bit away from components inside the enclosure. Type 4X
conduit and fittings must be used in order to maintain the outdoor rating of
the enclosure.
3.5.3 Mounting Procedure and Conduit Installation
1. Attach the mounting brackets to the back of the enclosure with the four
provided screws..
2. Fasten the enclosure to the selected surface via mounting holes.
3. Verify that the enclosure is not loose and that all connections are secure.
4. Attach the conduit between enclosure and load center, routing wires as
necessary for later use.
5. Make sure the conduit fittings are aligned properly and tightened securely to
prevent moisture from entering the enclosure (outdoor applications).
Figure 4: Mounting the Enclosure
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To reduce risk of electric shock, always open or disconnect
the circuit from the power distribution system of a building
before installing or servicing current transformers.
In accordance with NEC, CTs may not be installed in any panel
board where they exceed 75% of the wiring space of any crosssectional area.
3.6 Installation of Voltage Lines
1. Field wired voltage connections are made to the Mini Meter terminal block. The rated
torque for these terminal blocks is 4.4 in-lb, and can be used with solid and stranded
copper wires, at 12-18 AWG.
2. Verify that branch circuit fuse specifications meet local electric codes.
3. Connect 18 AWG min., 300 V min. insulated wiring for Line voltages and Neutral to
the appropriate locations in the breaker panel, in accordance with all national and local
electrical codes; see Figure 9 for wiring diagram.
4. Route wires through the conduit if not already done.
5. Trim the wire to the appropriate length to avoid coils of excess wiring.
6. Strip wiring to approximately .300 inches if needed and connect to the appropriate
terminals. Wires should be tightened so that they are held snuggly in place, but do not to
over-tighten, as this may compress and weaken the conductor.
3.7 Installation of Current Transformers
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General Requirements:
Splices on the CT leads must be within the meter enclosure, not inside the conduit.
Leviton provided CT leads are 24 inches minimum. Wire insulation should be stripped so
that the bare conductor length that connects to the meter terminal block does not exceed
0.300 inches.
CTs should be securely fastened such that they will not slide down to live terminals.
Wires should be tightened so that they are held snuggly in place, but do not to
overtighten, as this may compress and weaken the conductor.
Current and voltage inputs must be installed ‘in phase’ for accurate readings (e.g. CT1 on
Line 1, CT2 on Line 2)
Leviton solid core CTs
Installing solid core CTs
1. Route CT wires through the conduit if not already done.
2. Trim the wire to the appropriate length to avoid coils of excess wiring.
3. Strip wiring to approximately .300 inches and connect to the appropriate
terminals as described above.
4. With power turned off, disconnect each monitored conductor and slide on a
CT, ensuring the CT is correctly oriented as noted above.
5. Reconnect the conductors.
Failure to install CTs in the correct orientation and on the correct phase will lead to inaccurate
meter readings.
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3-Phase, 4 wire hookup diagram
Leviton
Leviton
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3.9 Testing the Installation
Testing Voltage
The power LED illuminates when the Mini Meter or Epoxy Encapsulated Module
has a proper power supply. Voltage should also be tested using an AC Voltmeter
to verify that the voltage across voltage line terminals (L1 to Neutral and L2 to
Neutral) is not in excess of the maximum rated voltage.
CT Reverse Phase Indicator
Mini Meters and EE Modules have a red reverse phase indicator LED as
described in section 2.3. There must be a load drawing a minimum of 1 A
connected to the meter in order for the reverse phase LED to function
correctly. If a proper load is connected, and the LED is illuminated, power down
the voltage supply and verify that CTs are installed correctly.
Load LED
The load LEDs are described in section 2.3. These LEDs should be pulsing at
50% duty cycle when the meter is connected properly and a constant load is
applied.
3.10 Securing the Enclosure
In accordance with safety requirements, enclosures must be secured using the
provided key lock once installation is complete. The purpose of the lock is to
prevent access to live parts that pose potential safety risks. To install the lock,
slide through the provided holes on the clamp side of the enclosure and fasten
securely.
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Problem
Solution
1. Power LED not illuminated
Check to make sure all connections are
wired
Test the voltage being supplied to the
meter using an AC voltmeter
With power off, remove any additional
line fuses and test with ohmmeter
2. Load LED not flashing
Verify CT connections and orientations
Make sure there is sufficient load to
draw a significant current
Test the voltage being supplied to the
meter using an AC voltmeter
3. Registered consumption low
Check to make sure the reverse phase
LED is not on
Even if the reverse phase light is off,
double-check CT orientations. One CT
installed in the incorrect direction
doesn’t always illuminate the reverse
phase LED
Make sure that current and voltage
connections are in phase
Check power connections and fuses
4. Reverse phase LED illuminated
Verify orientation and connection of CT
wires
Ensure that phasing is correct (CT1 on
Line 1, CT2 on Line 2)
Verify that a load drawing more than 1
Amp is connected to the meter
4. Maintenance
Properly installed meters with sound connections and secure conduit fittings should
not require user maintenance. If the meter is functioning abnormally, consult the
FAQ/Troubleshooting guide.
5. Troubleshooting/FAQ
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