Leviton 6M Series Technical specifications

February 28th , 2013
Models beginning with 6M, 6L or 6X
Mini Meter Multiple Meter Units (MMUs)
Product Description
Technical Specifications
Installation Instructions

Mini Meter MMU Installation Manual
Leviton Manufacturing Co., Inc. 1 Contents
List of Figures................................................................................................................................................2
List of Tables ................................................................................................................................................2
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
1.5.1 Enclosures...................................................................................................................3
2. Electrical Specifications ............................................................................................................................4
2.1 Electrical Specifications..............................................................................................................4
2.2 Input/Output Connections...........................................................................................................5
3. Installation Instructions..............................................................................................................................7
3.1 Explanation of Warning Symbols ..............................................................................................7
3.2 Safety Precautions.......................................................................................................................8
3.3 Preparation .................................................................................................................................8
3.4 List of Materials....................................................................................................................... ..8
3.5 Mounting the Enclosure .......................................................................................................... ..8
3.5.1 Mounting Location ....................................................................................................9
3.5.2 Conduit Openings ......................................................................................................9
3.5.3 Mounting Procedure and Conduit Installation..........................................................10
3.6 Installation of Voltage Lines.....................................................................................................10
3.7 Installation of Current Transformers .......................................................................................11
3.8 Testing the Installation.............................................................................................................17
3.9 Securing the Enclosure.............................................................................................................17
4. Maintenance............................................................................................................................................18
5. Troubleshooting/FAQ............................................................................................................................ 18
6. Contact Information................................................................................................................................ 19

Mini Meter MMU Installation Manual
Leviton Manufacturing Co, Inc. 2 List of Figures
List of Figures
Figure 1: Single Mini Meter case dimension..................................................................................4
Figure 2: Mini Meter Connections and Display.............................................................................5
Figure 6: Using the Conduit Template...........................................................................................9
Figure 7: Mounting the Enclosure.................................................................................................10
Figure 8: Voltage terminal fuse block ..........................................................................................11
Figure 9: Leviton solid core CTs ..................................................................................................12
Figure 10: Leviton split core CTs .................................................................................................13
Figure 11: 1 or 2 phase, 3-wire hookup diagram.......................................................................... 14
Figure 12: 2-phase, 3-wire hookup diagram................................................................................. 15
Figure 13: 3-phase, 4-wire hookup diagram................................................................................. 16
List of Tables
Table 1: Electrical and Environmental Specifications......................................................................4
Table 2: I/O Connections …………………................................................................................. 6
Table 3: Display Indicators………............................................................................................... 6
Table 5: Revision history.............................................................................................................. 28
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 (3-wire) configurations.
This guide is for use with Mini Meter Multiple Meter Units (MMUs).
1.2 Meter Features
Revenue-grade accuracy with solid-core or easy to install split core CTs
Built in LCD that displays total kWh and optional demand
Encapsulated model for harsh environments
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
Certified to California Division of Measurement Standards
Conforms to accuracy requirements set forth in ANSI C12.10 and C12.20
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.
1.5.1 Enclosures
MMU Enclosures are manufactured by BUD Industries, Inc (www.budind.com).
Specification sheets are available from their website, part numbers are as follows:
Medium Enclosure: NBB-15243

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Large Enclosure: NBB-15253
X-Large Enclosure: NBB-15258
2. Electrical Specifications
2.1 Mini Meter 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.
Table 1: Electrical and environmental specifications
1Product approved for use with included Leviton Current Transformers, as follows:
400A
200A

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100A
2Pollution Degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by
condensation must be expected.
2.2 Input/Output Connections and User Display
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)
Figure 2: Mini Meter connections and display
Power LED
Load LED
Optional LCD
Display area
Reverse Phase
LED
Sealing Studs

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CT2 : X2 Current Transformer input, CT2. White
wire of CT2 (7B and 5B models only)
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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3. Installation Instructions
The following section contains installation and wiring instructions for the Leviton Mini
Meter MMUs. 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
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.
3.2 Safety Precautions
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.

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Failure to follow these warnings could result in serious injury or death.
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.
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 inside the MMU and electrical panel for possible exposed wire, broken wire,
damaged components or loose connections.
3.4 List of Materials
Mini Meter or EE Module MMU and associated mounting materials.
Line 1, Line 2 and Neutral hook-up wires as need for the electrical service. Wires must
be 18 AWG or larger and insulated for 300 VAC minimum.
Current Transformers (CTs): This product is designed for use with IMS 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
MMUs 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 MMU.
It is recommended that the MMU be mounted near the disconnecting device in
an area with adequate ventilation. The MMU 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

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of reaching the enclosure from the breaker panel. If a suitable mounting location near the
panel cannot be found, additional inline fuses or circuit breaker may be required in
accordance with NEC regulations.
3.5.2 Drilling Conduit Holes
The center of this document contains a template for drilling conduit openings for
medium MMUs (10.5” x 7.5” x 4”). The template provides possible locations for
conduit openings that will not impair equipment integrity. Remove the template
from the manual, and use as described below. Conduit hole sizes must be
appropriate to fittings. Care should be exercised to keep drill bit away from components
inside the MMU. For large (19” x 15” x 8”) and extra-large (29” x 21” x 10”) enclosures
conduit holes should be located so as not to interfere with the installation of wires or
viewing of meters. UL Type 4X conduit and fittings must be used in order to
maintain the outdoor rating of the enclosure.
Using the Conduit Template (Medium Enclosure) (See Figure 6)
1. For a given side, the alignment dot should be located in the corner of the
enclosure closest to the overhang. Use the alignment dot to situate the
template flush against the appropriate side.
2. Make sure the ENCLOSURE OVERHANG arrow faces the lip of the
enclosure with the template fitted snugly against the overhang.
3. The shaded area indicates appropriate drill area for conduit holes. If possible,
holes should be centered along the striped black line. No part of the conduit
hole should extend outside of the shaded area.
Figure 4: Using the conduit template

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3.5.3 Mounting Procedure and Conduit Installation
1. Attach the mounting brackets to the back of the enclosure with the four
provided screws as shown in Figure 7.
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 in the enclosure (outdoor applications)
3.6 Installation of Voltage Lines
Note: A panel schedule is highly recommended for factory pre-wiring of MMU internal
voltage connections.
For Small to Medium Enclosures
1. Verify that branch circuit fuse specifications meet local electric codes.
Figure 4: Mounting the Enclosure

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2. 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.
3. Route wires through the conduit if not already done.
4. Trim the wire to the appropriate length to avoid coils of excess wiring.
5. For connections to the Mini Meter terminal, 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.
For Large and Extra Large Enclosures
1. Field wired voltage connections are made to the MMU terminal block. The maximum
approved torque rating for this Molex terminal block is 12 in-lb.
2. 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.
3. Route wires through the conduit if not already done.
4. Trim the wire to the appropriate length to avoid coils of excess wiring.
5. For connections to the voltage terminal block (see example in Figure 8), strip wiring to
approximately .300 inches 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.

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3.7 Installation of Current Transformers
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 cross-
sectional area.
General Requirements:
Splices on the CT leads must be within the meter enclosure, not inside the
conduit. 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.
For 1 or 2 Ph 3-Wire electrical panels, current and voltage inputs must be
installed ‘in phase’ for accurate readings (e.g. CT1 on Line 1, CT2 on Line 2).
For 3 Ph 4-wire electrical panels, see Figure 12 and follow factory-provided
meterschedules for correct CT locations.
Figure 9: 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.

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5. Reconnect the conductors.
Failure to install CTs in the correct orientation and on the correct phase will lead to inaccurate meter readings.
Installing split core CTs
1. Route CT wires through 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.
4. Connect the CT leads to the appropriate meter as described above.
5. With power to the conductors turned off, place one CT around each conductor,
ensuring that the white dot is facing the line side.
Failure to install CTs in the correct orientation and on the correct phase will lead to inaccurate meter readings.

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3.8 Testing the Installation
Testing Voltage
The power LED illuminates when the Mini Meter 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 voltage.
CT Reverse Phase Indicator
Each Mini meter in the MMUenclosure has a red reverse phase indicator LED. If any of
these LEDs are on, power down the voltage supply and verify that all 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 sufficient load is applied.
3.9 Securing the Enclosure
In accordance with safety requirements, MMUs 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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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. If the answer cannot be found there, contact Leviton
technical support.
5. Troubleshooting/FAQ
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

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6. Contact Information
Leviton Manufacturing Co., Inc. Global Headquarters
201 N. Service Rd. Melville, NY 11747-3138 • Tech Line: 1-800-824-3005 • FAX: 1-800-
832-9538
Leviton Manufacturing Co., Inc. Lighting & Energy Solutions
20497 SW Teton Avenue, Tualatin, OR 97062 • Telephone: [phone] • FAX:
503-404-5594
Metering Tech Support: (6:00AM-4:00PM P.S.T. Monday-Friday):
[email protected] 1-800-959-6004
Leviton Manufacturing of Canada, Ltd.
165 Hymus Boulevard, Pointe Claire, Quebec H9R 1E9 • Telephone: [phone] •
FAX: [phone]
Leviton S. de R.L. de C.V.
Lago Tana 43, Mexico DF, Mexico CP 11290 • Tel. [phone] •
www.leviton.com.mx
Visit our Website at www.leviton.com/les
© 2012 Leviton Manufacturing Co., Inc. All rights reserved. Subject to change without notice.