Cut Sheet

Volume 1—Residential and Light Commercial CA08100002E—August 2015 www.eaton.com V1-T4-119
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4.10
Metering Products
Group Metering
●
Eaton’s 1MM stacks are
single-
phase in, single-
phase out design
●
Eaton’s 3MM stacks are
three-phase in, single-
phase out design
●
Stacks with single-phase
horizontal bus are rated
240/120 V, single-phase,
three-wire. Stacks with
three-phase horizontal bus
are rated 208Y/120 V,
three-phase, four-wire, but
can be used on 240/120 V,
three-phase, four-wire
delta systems
●
All three-phase horizontal
bus modules have four-
wire cross bus, connected
A-B phase to vertical bus,
readily reconnectable for
phase balance on
installation
Note: Individual sockets cannot be
phase balanced, only each stack.
●
Short-circuit ratings up to
100,000 A
rms symmetrical
depending
upon AIC rating
of installed main tenant
circuit breakers and
main device
●
Main tenant feeders can
exit bottom or back.
Knockouts are available
at all exit locations
●
If being used in outdoor
application and exiting the
top, mount Myer type hubs
on rainproof cap
●
Provision for two-pole
breaker (plug-on type for
125 A sockets and bolt-on
type for 200 A sockets)—
circuit breakers not
included
●
Mechanically and
electrically built to bolt-up
with main service modules
and commercial modular
metering stacks
●
Aluminum or copper bus
●
800 or 1200 A horizontal
bus
●
All 3MM stacks include
fifth jaw at 9 o’clock
position
●
All 1MM stacks do not
include fifth jaw. Order
1MM5JK if needed
Catalog Number Selection
When Ordering:
1. Determine catalog number of Main Service Module.
2. Determine catalog number of Meter Stack (Residential or Commercial).
3. Find quantity and catalog numbers for tenant circuit breakers (found on Page V1-T4-127 or V1-T4-137).
Order one breaker per socket.
4. If any accessories are needed, order from Pages V1-T4-138 and V1-T4-139.
Phases
1 = Single-phase
3 = Three-phase
Options
Blank= Ring
RL= Ringless
RLB= Ringless with horn bypass
WB= Wall bracket (accessory)
BSK= Bussed spacer (accessory)
EB12= 12-inch (304.8 mm) elbow (accessory)
EB16= 16-inch (406.4 mm) elbow (accessory)
Number of Meters
2, 3, 4, 5 or 6
Blank = Accessory
Bus Type
Blank= Aluminum
C= Copper
Type of Metering
MM = Multiple metering
Ampere Rating
12= 125 A
20= 200 A
Blank= Accessory
Enclosure
R= Outdoor
Blank= Indoor
Bus Amperes
12= 200 A horizontal bus (3MM units only)
Blank= Standard 800 A bus
1 MM 4 12 R 12 C