Section 2: Metering Equipment PDF

Section 2: Metering Equipment PDF

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Indoor/Rainproof EZM General Information

Class 4100 / Refer to Catalog 4100CT0701

EZM General Information

NEMA 3R Construction



240 Vac Maximum, for use on AC systems, suitable for use as Service Equipment.


Utility Company Requirements Review local utility requirements to ensure that metering equipment meets their standards.


EZ Meter-Pak meter center enclosures meet NEC wire bending requirements, and are designed for wall mounting only (not suitable for floor mounting). All unmetered conductor compartments may be sealed by the utility company.


EZ Meter-Pak meter centers have UL Listed short circuit current ratings up to 100 kA at 240 Vac when properly applied. For three-tier series ratings refer to Data Bulletin 4100DB0301.


Suitable incoming services for an EZM main device and available outgoing feeder(s) to downstream panelboards from EZM branch section(s)—


Incoming Service to Main Device 120/240 Vac, 1Ø3W

Available outgoing feeder(s) to downstream panelboards:

  • 120/240 Vac, 1Ø3W
    (4-jaw ring type meter sockets, two-pole circuit breakers),
    (5-jaw ringless meter sockets, two-pole circuit breakers).

Incoming Service to Main Device 240/120 Vac, 3Ø4W Delta

Available outgoing feeder(s) to downstream panelboards:

  • 120/240 Vac, 1Ø3W (Fed from transformer’s “A-Phase” and “C-Phase” only.) NOTE: Connection to High-Leg “B-Phase” not permitted for this service
    (4-jaw ring type meter sockets, two-pole circuit breakers)
    (5-jaw ringless meter sockets, two-pole circuit breakers)
    Standard 3Ø IN/1Ø OUT branch units are not suitable for use on this Delta System. Special branch units are available for this System by adding suffix: “CA” to catalog number (Typical Examples: EZM313125XCA, EZM313125CUXCA, EZM314225CA, EZM314225XCA, EZM314225CUXCA, EZM315225CA, EZM314225CUCA, etc.).

  • 240/120 Vac, 3Ø4W Delta (7-jaw meter sockets, three-pole circuit breakers).

Incoming Service to Main Device 208Y/120 Vac, 3Ø4W

Available outgoing feeder(s) to downstream panelboards:

  • 120/208 Vac, 1Ø3W (5-jaw meter sockets, two-pole circuit breakers)

  • 208Y/120 Vac, 3Ø4W (7-jaw meter sockets, three-pole circuit breakers).

Main Devices


  • 400, 600 and 800 A main disconnects may be end-mounted with branch units having 800 A or 1200 A continuous horizontal cross bus.

  • 1000 and 1200 A main disconnect or terminal box must be center mounted when used with branch devices with main bus rated 800 A continuous.

  • 1600 A main disconnect or terminal box must be center mounted.

  • 2000 A main disconnect must be center mounted and requires use of branch units having 1200 A continuous horizontal cross bus.

  • 400, 800 and 1200 A Type EZM-TBU terminal boxes supplied with lug landings to meet EUSERC requirements.

Main Circuit Breaker ratings: 400, 600, 800, 1000, 1200, 1600 and 2000 A

Main Fusible Switch ratings: 400, 600, 800, and 1200 A (1Ø3W only)

Main Lugs Terminal Box ratings: 225, 400, 600, 800, 1200, 1600, and 2000 A

Branch Units

  • 125 and 225 A residential branch units are available in ring type or ringless type construction and are supplied with 800 A continuous aluminum horizontal cross bus as standard (Example: EZM314125). For optional 1200 A continuous copper horizontal cross bus with aluminum vertical connectors, add suffix “X” to catalog number (Example: EZM314125X). For optional 1200 A continuous all-copper bussing, add suffix “CUX” to catalog number (Example: EZM314125CUX). NOTE: 5-gang 225 A EZM, EZMR and EZMH residential branch units are supplied with 1200 A continuous Cross Bus as standard, do not add suffix “X” or “CUX” to these units (Examples: EZMR315225 or EZMR315225CU). Plug-in style residential meter sockets are available as ring type EZM without bypass, ringless type EZMR without bypass, and ringless type EZMH with horn bypass.
    Tenant circuit breakers must be ordered separately for these branch units. 125 A max. units make use of Type QO, QO-VH or QO-H two-pole tenant circuit breakers (40–125 A). 225 A max. units make use of Type QDP-TM, QBP-TM, QGP-TM and QJP-TM two-pole tenant circuit breakers (70–225 A), and may also make use of two-pole Type QO (40–125 A at 10 kA max.), two-pole Type QO-VH (40–60 A at 100 kA max.), or two-pole Type QO-H (40–60 A at 100 kA max.) tenant circuit breakers.

  • 225 A commercial branch units are available in ring type or ringless type construction and are supplied with 1200 A copper horizontal cross bus with aluminum vertical connectors as standard (Example: EZML314225). For optional 1200 A continuous all-copper bussing, add suffix “CU” to catalog number (Example: EZML314225CU). Plug-in style commercial meter sockets are available as ring type EZMT with test block bypass (meets EUSERC requirements), ringless type EZMR without bypass, and ringless type EZML with lever bypass.

    225 A max. units make use of type QDP-TM, QBP-TM, QGP-TM and QJP-TM two-pole or three-pole tenant circuit breakers (70– 225 A), and may also make use of two-pole type QO (40–125 A at 10 kA max.), two-pole type QO-VH (40–60 A at 100 kA max.), or two-pole type QO-H (40–60 A at 100 kA max.) tenant circuit breakers.

Note: QO, QO-VH and QO-H tenant circuit breakers used in 225 A branch units require the use of adapter EZM125QOA (purchased separately).

  • 400 A branch units are available in ringless type construction only, and are supplied with 1200 A continuous all-copper bussing as standard (Example: EZML332400). These branch units are supplied with factory-installed type LJL tenant circuit breakers that have a field adjustable ampere rating trip setting from 125 A min. to 400 A max.
    A tamper-evident seal kit is available where needed, order seal kit MICROTUSEAL (refer to NEC 240-6 [c]). 400 A branch units are available as Type EZML with plug-in style lever bypass type meter sockets, or Type EZMK with bolt-on style with manual bypass type meter sockets.

  • Units having 800 A continuous horizontal cross bus WILL CONNECT with units having 1200 A continuous horizontal cross bus.

  • Single phase units (three bus bars in horizontal cross bus) WILL NOT CONNECT with three phase units (four bus bars in horizontal cross bus).

For Load Center Three-Tiered Series Ratings used downstream from Metering Equipment, refer to Data Bulletins: 4100DB0301 and 2700DB9901.

EZM Configuration Information

EZM Mains Devices

Number Segment

Character

Description

EZM

1

1000

CB

U

CU

Device Name

EZM

EZ Meter-Pak Meter Center

      

Service Feed

1

1Ph, 3W

    

3

3Ph, 4W

    

Mains Rating

  

225 A

        
 

400 A

        
 

600 A

        
 

800 A

        
 

1000 A

        
 

1200 A

        
 

1600 A

        
 

2000 A

        

Main Type

CB

Main Circuit Breaker

  

FS

Main Fusible Switch

  

TB

Terminal Box

  

GCB

Main Circuit Breaker (65 kAIC)

  

JCB

Main Circuit Breaker (100 kAIC)

  

Feed Direction

Blank

Overhead / Underground

        

C

Overhead / Underground

B

Underground Only

T

Overhead Only

U

Underground Only, Meets EUSERC Standards up to 1200 A max.

E

Underground Only, Meets EUSERC Standards up to 1200 A max.

Special Construction

Blank

Aluminum Horizontal Cross Bus Bar up to 1000A max.

CU

Copper Horizontal Cross Bus Bar

MS

Includes Energy Reduction Maintenance Switch

This table is for interpreting existing part numbers only. All possible combinations are not available.

EZM Branch Devices

Number Segment

Character

Description

EZM

R

1

1

3

125

CU

Device Name

EZM

EZ Meter-Pak Meter Center

Socket/Bypass Type

Blank

Ring Type

R

Ringless Type with 5th Jaw

H

Ringless with Horn Bypass and 5th Jaw

L

Lever Bypass with 5th Jaw, 7th Jaw if Three Phase

T

Ring Type Test-Block Bypass EUSERC

K

K-Base Bolt-On Type

Service Feed

1

1Ph, 3W

    

3

3Ph, 4W

    

Load Feed

1

1Ph, 3W

3

3Ph, 4W

Number of Meter Sockets

Meter Sockets Available

1,2,3,4,5 or 6

  

Maximum Tenant Circuit Breaker Amperage

125

125 A

225

225 A

400

400 A

Special Construction

Blank

Aluminum Horizontal Cross Bus Bar

CA

For 240/120 Vac Delta Systems

CU

Copper Horizontal Cross Bus Bar

D

Removable Drip Hood with Indoor Top Endwall with Knockouts

M10

10-Inch Meter Centers

X

1200A Copper Horizontal Cross Bus Bar
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