Technical Data Bulletin
2-18
© 2019 Schneider Electric
All Rights Reserved
EZ Meter-Pak™ Meter Centers
3 Phase Branch Devices
schneider-electric.us
Class 4162 / Refer to Catalog 4100CT0701
EZMK311400
Table 2.26: Branch Units—400 A Maximum Commercial
System Type
Number
of Meter
Sockets
Horizontal
Cross Bus
Rating
Ringless Type Meter Socket
with Lever Bypass and Jaw
Release—Includes Factory-
Installed 400 A Type LJL
Circuit Breaker. [52], [53]
Ringless Type K Bolt-on
Meter Socket with Manual
Bypass—Includes
Factory-Installed 400 A
Type LJL Circuit Breaker.
[53]
Cat. No.
Width (in.)
Cat. No.
Width
(in.)
3Ø Incoming and 1Ø Outgoing [54]
3Ø4W 208Y/120 Vac
5-Jaw Meter Socket
2P Circuit Breakers
1 1200 A Cu EZML311400 23.21 EZMK311400 27.56
2 1200 A Cu EZML312400 23.21 EZMK312400 27.56
3Ø Incoming and 3Ø Outgoing
3Ø4W 240/120 Vac
Delta
or 208Y/120 Vac
7-Jaw Meter Socket
3P Circuit Breakers
1 1200 A Cu EZML331400 23.21 EZMK331400 27.56
2 1200 A Cu EZML332400 23.21 EZMK332400 27.56
3Ø–1Ø OUT EZM Branch Unit Phase Balancing Flexibility
Starting Position Possible Ending Position
(By moving only one “Z”
connector)
AØ and BØ can be changed to AØ and CØ
AØ and CØ can be changed to AØ and BØ or BØ and CØ
BØ and CØ can be changed to AØ and CØ
The major benefit of factory phase balancing is that most jobs will not require field phase
balancing. To see if meter socket phase balancing in the field is required (refer to wiring
diagram for complete instructions):
A. Determine if the load in amperes on each phase of the transformer using handle rating
of tenant circuit breakers installed at each number of meter sockets. Use Phase
Balancing Chart to determine total number of connections each meter socket makes on
each phase of transformer.
B. If phase balancing is required, determine which meter sockets should be changed to
properly phase balance metering equipment lineup.
C. Once meter socket(s) is selected to be phase balanced, remove individual meter
socket cover from each meter socket to be phase balanced. The vertical bus bars
running top to bottom in the branch unit behind each meter socket are phased: AØ, BØ,
CØ, left to right.
D. By moving only the line side meter socket “Z” shaped connectors per meter socket to
be changed, phase balancing can easily be accomplished on-site:
Table 2.27: Example: To change an AØ and CØ meter socket to a BØ and CØ socket
Starting Position
Meter Socket Phaseing: AØ and CØ
Step 2: Loosen hex nut from AØ line side meter socket jaw
and slide “Z” connector down to free connector from stud.
Step 1: Remove hex nut from AØ line side connection to
vertical bus.
Step 3: Rotate “Z” connector to right and align with stud on BØ
vertical bus.
Step 4: Slide “Z” connector up to engage stud on BØ vertical
bus. Torque hex nut of meter socket jaw to 75 lb-in (8 N•m).
Step 6: Replace hex nut (removed in Step 1) onto stud of BØ
vertical bus and torque to 75 lb-in (9 N•m).
Phase balancing of meter socket is complete: BØ and CØ.
2
METERING EQUIPMENT
[52] Supplied with Class 320 lever bypass meter socket. Use anti-inversion clip kit, catalog number MMLRK, if required. See page 2-21.
[53] LJL circuit breaker has adjustable trip settings from 125-400 A. Use seal kit MICROTUSEAL, if required. LJL circuit breaker terminal lug kit factory-installed and accommodates (2) 2/0-500
kcmil Cu-Al per phase. Alternate lug kit AL400L61K3 for LJL circuit breaker is available, see page 2-21.
[54] For 240/120 Vac Delta Systems add Suffix “CA” to catalog number (Example: EZML312400CA). All meter sockets are phased A and C only. Price remains the same as the base catalog
number. “Order only” branch units, not stocked in PDS (4–6 week delivery). Order point Lexington.
5/15/2019