Three-Phase Branch Devices

Class 4162 / Refer to Catalog 4100CT0701

Three-Phase Branch Devices—NEMA 3R Construction

Branch Units—Three-phase Incoming and Single-phase Outgoing

System Type	Number of Meter Sockets	Horizontal Cross Bus Rating	Ring Type 5-Jaw Meter Socket without Bypass^[1]		Ringless Type 5-Jaw Meter Socket without Bypass		Ringless Type 5-Jaw Meter Socket with Horn Bypass		Ringless Type 5-Jaw Meter Socket with Lever Bypass
System Type	Number of Meter Sockets	Horizontal Cross Bus Rating	Cat. No ^[2]	Width (in.)	Cat. No ^[2]	Width (in.)	Cat. No ^[2]	Width (in.)	Cat. No ^[2]	Width (in.)
125 A Maximum (Order Type QO, QO-VH or QOH Circuit Breakers Separately) ^[3] ^[4]
Three-phase, Four-wire 208Y/120 Vac 5-Jaw-Meter Socket 2P Branch Circuit Breakers	3	800 A	EZM313125	12.25	EZMR313125	12.25	EZMH313125	12.25	EZML313125	15.56
		800 A	EZM313125M10 ^[5]		—		—		—
		1200 A	EZM313125X		EZMR313125X		EZMH313125X		EZML313125X
	4	800 A	EZM314125		EZMR314125		EZMH314125		EZML314125
		800 A	EZM314125M10 ^[5]		—		—		—
		1200 A	EZM314125X		EZMR314125X		EZMH314125X		EZML314125X
	5	800 A	EZM315125		EZMR315125		EZMH315125		EZML315125
		800 A	EZM315125M10 ^[5]		—		—		—
		1200 A	EZM315125X		EZMR315125X		EZMH315125X		EZML315125X
	6	800 A	EZM316125		EZMR316125		EZMH316125		EZML316125
		800 A	EZM316125M10 ^[5]		—		—		—
		1200 A	EZM316125X		EZMR316125X		EZMH316125X		EZML316125X
225 A Maximum (Order Type QBP-TM, QDP-TM,QGP-TM or QJP-TM Circuit Breakers Separately) ^[6]
Three-phase, Four-wire 208Y/120 Vac 5-Jaw-Meter Socket 2P Branch Circuit Breakers	2	800 A	EZM312225	17.38	EZMR312225	17.38	EZMH312225	17.38	—	—
	2	1200 A	EZM312225X		EZMR312225X		EZMH312225X		—	—
	3	800 A	EZM313225		EZMR313225		EZMH313225		—	—
	3	1200 A	EZM313225X		EZMR313225X		EZMH313225X		—	—
	4	800 A	EZM314225		EZMR314225		EZMH314225		—	—
	4	1200 A	EZM314225X		EZMR314225X		EZMH314225X		—	—
	5	1200 A	EZM315225		EZMR315225		EZMH315225		—	—
	5	1200 A	EZM315225CU		EZMR315225CU		EZMH315225CU		—	—
	6	1200 A	EZM316225		EZMR316225		EZMH316225		—	—
		1200 A	EZM316225CU		EZMR316225CU		—		—	—
		1200 A	EZM316225CA		EZMR316225CA		EZMH316225CA		—	—

Branch Units—225 A Maximum Commercial

		System Type	Number of Meter Sockets	Horizontal Cross Bus Rating	Ringless Type Meter Socket without Bypass		Ringless Type Meter Socket with Lever Bypass and Jaw Release		Ring Type Meter Socket with Test Block Bypass. Meets EUSERC Requirements
		System Type	Number of Meter Sockets	Horizontal Cross Bus Rating	Cat. No. ^[2]	Width (in.)	Cat. No. ^[2]	Width (in.)	Cat. No.	Width (in.)
EZML313225	EZMT311225 EZMT311225 Without Cover	Three-phase Incoming and Single-phase Outgoing ^[7] (Order Type QBP-TM, QDP-TM,QGP-TM or QJP-TM circuit breakers separately) ^[6]
		Three-phase, Four-wire 208Y/120 Vac 5-Jaw Meter Sockets 2P Branch Circuit Breakers	1	1200 A	—	—	—	—	EZMT311225 ^[8]	22.42
			2	1200 A	—	—	EZML312225	19.44	EZMT312225 ^[8]	22.42
			3	1200 A	—	—	EZML313225	19.44	EZMT313225 ^[8]^[9]	22.42
			4	1200 A	—	—	EZML314225	19.44	—	—
		Three-phase Incoming and Three-phase Outgoing (Order QBP-TM, QDP-TM, QGP-TM or QJP-TM circuit breakers separately.
		Three-phase, Four-wire 240/120 Vac Delta or 208Y/120 Vac 7-Jaw Meter Socket 3P Branch Circuit Breakers	1	1200 A	—	—	EZML331225	19.44	EZMT331225 ^[8]	22.42
			1	1200 A	—	—	EZML331225CU	19.44	—	—
			2	1200 A	EZMR332225	19.44	EZML332225	19.44	EZMT332225 ^[8]	22.42
			3	1200 A	EZMR333225	19.44	EZML333225	19.44	EZMT333225 ^[8]^[9]	22.42
			3	1200 A	—	19.44	EZML333225D ^[3]	19.44	—	—
			4	1200 A	EZMR334225	19.44	EZML334225	19.44	—	—
			4	1200 A	—	19.44	EZML334225D ^[3]	19.44	—	—

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. ^[10], ^[11]		Ringless Type K Bolt-on Meter Socket with Manual Bypass—Includes Factory-Installed 400 A Type LJL Circuit Breaker. ^[11]
System Type	Number of Meter Sockets	Horizontal Cross Bus Rating	Cat. No.	Width (in.)	Cat. No.	Width (in.)
Three-phase Incoming and Single-phase Outgoing ^[12]
Three-phase, Four-wire 208Y/120 Vac 5-Jaw Meter Socket 2P Circuit Breakers	1	1200 A Cu	EZML311400	23.21	—	—
	2	1200 A Cu	EZML312400	23.21	—	—
Three-phase Incoming and Three-phase Outgoing
Three-phase, Four-wire 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

Three-Phase–Single-Phase 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, do the following (refer to wiring diagram for complete instructions):

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.
If phase balancing is required, determine which meter sockets should be changed to properly phase balance metering equipment lineup.
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.
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: