SMM Switchboards - Siemensw3.usa.siemens.com/us/.../Switchboards/Switchboards/SMMS_A.pdfSMM Switchboards For EUSERC Utility Area Installations Select sockets with tenant mains for

commercial

SMM SwitchboardsSelection and Application Guide

Separate Metering For Multi-TenantsIn today’s commercial and industrialdevelopments, the electrical require-ments of individual stores, offices and other tenants often vary widely.The commercial metering systems that serve these developments must be flexible enough to meet the diverseneeds of tenants, yet economical andeasy to install.

Siemens solves the problem with SMM commercial metering switchboards whichcan be customized for each application.Completely engineered and assembled, Siemens commercial metering switch-boards require minimal field assembly.They are UL listed and labeled. Plus, they are rugged and built for the specialrequirements of the West Coast andmeet all EUSERC standards. Each can be modified to meet any additionalrequirements of member utilities andmunicipalities. More importantly, theymeet your standards for high quality,dependable commercial metering switchboards.

Stronger, Lighter and CoolerCompact, yet exactly the right size forsmall to medium sized projects, the SMM is sturdy and tamper resistant.SIemens engineers made it evenstronger than before with specially reinforced corners that offer additionalstrength and permit overall weightreduction. The lighter weight speedsinstallation and is a welcomed benefit to the installing electrician.

Other modifications improved venti-lation. Increased ventilation resulted in a “cooler running” unit.

New Look, Fits In AnywhereSiemens industrial designers have totallychanged the look of the switchboards.High-tech black hardware and sleek linesof the front give the SMM a contempo-rary appearance compatible with today’scommercial and industrial interiors. TheSMM is available with or without testblocks and load cable can exit throughthe top or bottom of the switchboard.You may choose a common depth formain and metering sections, and if youneed corner sections just request them.

Available With Circuit Breaker, Fusible or T-Fuse Pullout UnitsThe SMM has all the flexibility you’ll ever need. Metering sections are avail-able in full sections with up to six metersockets and half-sections with up tothree meter sockets. Each section isassembled complete with all sockets pre-wired on line and load side ready for installation of 100 or 200 amperewatthour meters. All sockets are rated200A continuous duty.

Three types of tenant mains are avail-able: circuit breakers, fused switches and T-Fuse pullouts, with short circuitinterrupting ratings from 10,000 to200,000 amperes. You get Siemens quality and all the choice you can use.

Service Makes The DifferenceSiemens service begins long before any sale. A phone call to your Siemenssales engineer for advice or counsel on a project could save you a lot of time and money with suggestions for simpli-fication or modification of your plans.Should your Siemens contact not havethe immediate answer, he’s got an enor-mous resource of a company behind him with professionals who have solved electrical problems for over a century.

And if you’re in a time crunch and needswitchboards or other electrical compo-nents in a hurry, we’ve got the most responsive quick ship programs around.

SMM SwitchboardsCommercial Metering ForWest Coast Utility Specifications

New Corner Posts and Improved Ventilation

Other Key Features

UL Listed and Labeled

4000A Main Service, 480V Maximum

Attractive Black Hardware

Aluminum or Copper Main Bus

65,000A Symmetrical Bracing (Standard)

200A Continuous Duty Sockets

Hot Sequence Metering (Standard)

With or Without Test Blocks

Rear Cable Barrier Available for Top Load Cable Exit

Hinged Cover Over Tenant Disconnects

20 Inch Depth up to 2500 Amperes (SMM Sections)

28 Inch Depth, 3000-4000 Amperes (SMD Sections)

Type 3R Construction Available

1

Standards

Switchboard– UL 891– NEMA PB-2

Meter Sockets– UL 414– ANSI C12.7

Circuit Breakers– UL 489

Fused Switches– UL 98

Bolted Pressure Switches

– UL 977

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Other Key Features

UL Listed and Labeled

4000A Main Service, 480V Maximum

Attractive Black Hardware

Aluminum or Copper Main Bus

65,000A Symmetrical Bracing (Standard)

200A Continuous Duty Sockets

Hot Sequence Metering (Standard)

With or Without Test Blocks

Rear Cable Barrier Available for Top Load Cable Exit

Hinged Cover Over Tenant Disconnects

20 Inch Depth up to 2500 Amperes (SMM Sections)

28 Inch Depth, 3000-4000 Amperes (SMD Sections)

Type 3R Construction Available

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Configurations Available

Branch Vacu-Break®Fusible Switches.Available 240V and 480V,100A or 200A ratings.

T-Fuse pull-outs for tenant mains. Hinged cover allows padlocking to prevent unauthorized access.

Meter sockets with test blocks.All rated 200A continuous duty.

3

Mains:

Ampere Rating 400 600 800 1200 1600 2000 2500 3000BreakerFrame JD6 LD6 MD6 ND6 PD RD PC PC

I.C. VoltsStd. 240 65 65 65 65 65 65 100 100

480 35 50 50 50 50 50 100 100BreakerFrame HJD6 HLD6 HMD6 HND6 HPD HRD — —

High 240 100 100 100 100 100 100 — —480 65 65 65 65 65 65 — —

� RMS Symmetrical Amperes (KA)

Circuit Breakers And Their Ratings �

Tenant Metering:

ISMMLarge Tenant

or House Service400, 600, 800, 1200A

(Table 5A, 5B)

Tenant MeteringUnit Module

200A Maximum(Table 8A, 8B, 8C)

6SMM6SMD

Tenant Metering6-Unit

(Table 4A, 4B, 4C)

3SMM3SMD

Tenant Metering3-Unit

(Table 4A, 4B, 4C)

Auxiliary Sections:

CSCornerSection

(Table 9)

or

Selection Instructions1. If underground pull section is required, select from Table 1. Select main from Table 2A, 2B or 2C.2. For areas where combined underground pull sections and mains are acceptable, select from

Table 3A, 3B or 3C.3. Select SMM sections from Tables 4A, 4B or 4C.4. Select tenant main complete with meter socket from Tables 5A, 5B, 8A, 8B or 8C.5. Select SMM cross bus from Table 7A or 7B.6. If required, select modifications from Table 9.

UP + C, V, BFull Height UGPS

+ Main Device(Table1/Table2)

UC, UV, UBCombinationMain/UGPS(Table 3)

and/or

LWBussed Load Wireway

for top exit from SMM Sections

(Table 9)

Circuit breaker tenant mains.Each breaker has device for padlocking in open position.

SMM SwitchboardsFor EUSERC Utility Area Installations

Table 1Underground Pull Sections Excluding LADWP � �

120/240V 240/120V 208Y/120V 480Y/277V1 Phase 3 Phase 3 Phase 3 Phase3 Wire 4 Wire 4 Wire 4 Wire Dimensions

Ampere Catalog Catalog Catalog Catalog (inches)

Rating Number Number Number Number W D

400 UP21400 UP24400 UPG4400 UP44400 32800 UP21800 UP24800 UPG4800 UP44800 32

1200 UP21120 UP24120 UPG4120 UP44120 38 201600 UP21160 UP24160 UPG4160 UP44160 402000 UP21200 UP24200 UPG4200 UP44200 40 282500 UP21250 UP24250 UPG4250 UP44250 483000 UP21300 UP24300 UPG4300 UP44300 484000 UP21400 UP24400 UPG4400 UP44400 52 38

Use devices from Tables 2A, 2B or 2C with underground pull sections from Table 1.

Table 2ACircuit Breaker Mains Without Underground Pull Sections �

120/240V 240/120V 208Y/120V 480Y/277V1 Phase 3 Phase 3 Phase 3 Phase2 Wire 4 Wire 4 Wire 4 Wire Dimen.

Amp I.C. I.C. Catalog Catalog Catalog Catalog (inches)Rat. Std. High. Number Number Number Number W D

400 X C21400S C24400S CG4400S C44400S 32400 X — C24400H CG4400H C44400H 32600 X C21600S C24600S CG4600S C44600S 32 20600 X — C24600H CG4600H C44600H 32800 X C21800S C24800S CG4800S C44800S 32800 X — — C24800H CG4800H C44800H 32

1200 X — — C24120S CG4120S C44120S � 38 281200 X — C24120H CG4120H C44120H� 381600 X — C24160S CG4160S C44160S � 381600 X — C24160H CG4160H C44160H� 382000 X — C24200S CG4200S C44200S � 462500 X — C24250S CG4250S C44250S � 463000 X — C24300S CG4300S C44300S � 46

Table 3ACircuit Breaker Main Combined With Underground Pull Sections � �

Table 2BVacu-Break Switch MainsWithout Underground Pull Sections � �




400 V21400R � V24400R � VG4400R � V44400R � 32400 V21400T V24400T VG4400T V44400T 32600 V21600R � V24600R � VG4600R � V44600R � 32 20600 V21600T V24600T VG4600T V44600T 32800 V21800L V24800L VG4800L V44800L 38 28

1200 V21120L V24120L VG4120L — 38 28

Table 2CBolted Pressure Switch MainsWithout Underground Pull Sections �




800 B21800L B24800L BG4800L B44800L 381200 B21120L B24120L BG4120L B44120L � 38 281600 B21160L B24160L BG4160L B44160L � 382000 B21200L B24200L BG4200L B44200L � 382500 B21250L B24250L BG4250L B44250L � 463000 B21300L B24300L BG4300L B44300L � 46 384000 B21400L B24400L BG4400L B44400L � 46

120/240V 240/120V 208Y/120V 480Y/277V1 Phase 3 Phase 3 Phase 3 Phase2 Wire 4 Wire 4 Wire 4 Wire

Ampere I.C. I.C. Catalog Catalog Catalog CatalogRating Std. High. Number Number Number Number

400 X UC21400S UC24400S UCG4400S UC44400S400 X — UC24400H UCG4400H UC44400H600 X UC21600S UC24600S UCG4600S UC44600S600 X — UCG4600H UCG4600H UC44600H800 X UC21800S UC24800S UCG4800S UC44800S800 X — UC24800H UCG4800H UC44800H

1200 X — UC24120S UCG4120S UC44120S �1200 X — UC24120H UCG4120H UC44120H�

1600 X — UC24160S UCG4160S UC44160S �1600 X — UC24160H UCC4160H UC44160H �

2000 X — UC24200S UCG4200S UC44200S �

Table 3BVacu-Break Switch Main Combined With Underground Pull Sections � � �


Ampere Catalog Catalog Catalog CatalogRating Number Number Number Number

400 UV21400R � UV24400R � UVG4400R � UV44400R �

400 UV21400T UV24400T UVG4400T UV44400T600 UV21600R � UV24600R � UVG4600R � UV44600R �

600 UV21600T UV24600T UVG4600T UV44600T800 UV21800L UV24800L UVG4800L UV44800L

1200 UV21120L UV24120L UVG4120L —

Table 3CBolted Pressure Switch Main Combined With Underground Pull Sections � �


Ampere Catalog Catalog Catalog CatalogRating Number Number Number Number

800 UB21800L UB24800L UBG4800L UB44800L1200 UB21120L UB24120L UBG4120L UB44120L �

1600 UB21160L UB24160L UBG4160L UB44160L �

2000 UB21200L UB24200L UBG4200L UB44200L �

� For weatherproofing, add “W” to catalog number.� To meet LADWP requirements, add ”L” to catalog number.� Ground fault protection system is included consisting of (1) zero sequence

current sensor; (1) ground fault relay; (1) shunt trip on disconnect; (1) control power transformer.

� Suffix R = R-fuse provision; T = T-fuse provision; L = L-fuse provision.� For J-fuse provisions, change R to J in catalog number.� Do not use in areas where combination underground pull section and main

device are not applicable.

4

Table 1 Table 2A Tables 2B, 2C Table 3A Tables 3B, 3C


� Select sockets with tenant mains for Tables 8A, 8B or 8C.� Cross bus not included. Add from Table 7A or 7B.� For J-fuse provisions, change R to J in catalog number.� Suffix R = R-fuse provision; T = T-fuse provision; L = L-fuse provision.� Add per each SMM section from Tables 4A, 4B or 4C.� For weatherproofing, add “W” to end of catalog number� Commercial meter socket with test block only. For socket, test block and

tenant main, use Tables 8A, 8B or 8C.

Table 4ASMM Sections With Space For Circuit Breaker Tenant Mains and Sockets � � �

Soc- 120/240V 240/120V 208Y/120V 480Y/277V

Max. kets 1 Phase 3 Phase 3 Phase 3 PhaseCross Per Catalog Catalog Catalog Catalog DepthBus Fig. Sect. Number Number Number Number (ins.)

2500 A 3 3SMM21C 3SMM24C 3SMMG4C 3SMM44C 20B 6 6SMM21C 6SMM24C 6SMMG4C 6SMM44C 20

4000 A 3 3SMD21C 3SMD24C 3SMD64C 3SMD44C 28B 6 6SMD21C 6SMD24C 6SMD64C 6SMD44C 28

Table 4BSMM Sections With Space For T-Fuse Pullout Tenant Mains and Sockets � � �

Soc- 120/240V 240/120V 208Y/120V 480Y/277V


2500 A 3 3SMM21T 3SMM24T 3SMMG4T 3SMM44T 20B 6 6SMM21T 6SMM24T 6SMMG4T 6SMM44T 20

4000 A 3 3SMD21T 3SMD24T 3SMD64T 3SMD44T 28B 6 6SMD21T 6SMD24T 6SMD64T 6SMD44T 28

Table 4CSMM Sections With Space For Vacu-Break Switch Tenant Mains and Sockets � � � �

Soc- 120/240V 240/120V 208Y/120V 480Y/277V


2500 C 2 2SMM21R� 2SMM24R � 2SMMG4R� — 20D 6 — — — 6SMM44R� 20C 2 2SMM21T 2SMM24T 2SMMG4T — 20D 6 — — — 6SMM44T 20

4000 C 2 2SMD21R � 2SMD24R � 2SMDG4R� — 28D 6 — — — 6SMD44R � 28C 2 2SMD21T 2SMD24T 2SMD64T — 28D 6 — — — 6SMD44T 28

Table 7ACross Bus 2 or 3 Socket Sections �

Ampere 3 Phase, 4 Wire 1 Phase, 3 WireRating Catalog Number Catalog Number

800 XB3480 XB31801200 XB3412 XB31121600 XB3416 XB31602000 XB3420 XB31202500 XB3425 XB31253000 XB3430 XB31304000 XB3440 XB3140

Table 6200A Socket and Test Block �

Catalog Number

1 Phase, 3 Wire MS20013 Phase, 4 Wire MS2003

Table 7BCross Bus 6 Socket Sections �

Ampere 3 Phase, 4 Wire 1 Phase, 3 WireRating Catalog Number Catalog Number

800 XB6480 XB61801200 XB6412 XB61121600 XB6416 XB61602000 XB6420 XB61202500 XB6425 XB61253000 XB6430 XB61304000 XB6440 XB6140

Table 5ATenant Metering and Circuit Breaker Mains above 200A �

120/240V 120/240V 120/208V 480/277V1 Phase 3 Phase 3 Phase 3 Phase3 Wire 4 Wire 4 Wire 4 Wire Dim.

Ampere Catalog Catalog Catalog Catalog (ins.)

Rating Number Number Number Number W D400 1SMM21C4S 1SMM24C4S 1SMMG4C4S 1SMM44C4S 38 20400 1SMM21C4H 1SMM24C4H 1SMMG4C4H 1SMM44C4H 38 20600 1SMM21C6S 1SMM24C6S 1SMMG4C6S 1SMM44C6S 38 20600 1SMM21C6H 1SMM24C6H 1SMMG4C6H 1SMM44C6H 38 20800 1SMM21C8S 1SMM24C8S 1SMMG4C8S 1SMM44C8S 38 20800 — 1SMM24C8H 1SMMG4C8H 1SMM44C8H 38 20

1200 — 1SMM24C12S 1SMMG4C12S 1SMM44C12S 38 281200 — 1SMM24C12H 1SMMG4C12H 1SMM44C12H 38 28

Table 5BTenant Metering andVacu-Break Fusible Mains above 200A �

120/240V 120/240V 120/208V 480/277V1 Phase 3 Phase 3 Phase 3 Phase3 Wire 4 Wire 4 Wire 4 Wire Dim.

Ampere Catalog Catalog Catalog Catalog (ins.)Rating Number Number Number Number W D

400 1SMM21V4R 1SMM24V4R 1SMMG4V4R 1SMM44V4R 38 20400 1SMM21V4T 1SMM24V4T 1SMMG4V4T 1SMM44V4T 38 20600 1SMM21V6R 1SMM24V6R 1SMMG4V6R 1SMM44V6R 38 20600 1SMM21V6T 1SMM24V6T 1SMMG4V6T 1SMM44V6T 38 20800 1SMM21V8L 1SMM24V8L 1SMMG4V8L 1SMM44V8L 38 20

1200 — 1SMM24V12L 1SMMG4V12L — 38 28

5

20“ 32“ 20“ 32“ 26“

Figure A Figure B Figure C Figure D


� Required for top exit of load cables.� Add to catalog numbers of sections from Tables 1, 2, 3, 4 and 5.� Add to catalog numbers of cross bus from Tables 7A and 7B.� Select mains (2 required) from Tables 2A, 2B, 2C, 3A, 3B or 3C. Add suffix to

catalog number.� Add to catalog number of mains from tables 2A, 2C, 3A or 3C. Not available

on fusible switches from Tables 2B or 3B. Also see footnote 3 on page 4.

Table 9Modifications

CatalogItem Description Number

01 Corner Section 800A CS800

02 1200A CS120

03 1600A CS160

04 2000A CS200

05 Rear Load Barrier RLB �

06 Load Side Warranty 14” LW14

07 20” LW20

08 Lugs with Pullbox for Overhead Service 400A LP400

09 600A LP600

10 800A LP800

11 1000A LP100

12 1200A LP120

13 Nameplate (Engraved) NP1

14 Weatherproof W �

15 Copper Bus CU �

16 Dual Mains DM �

17 Ground Fault on Main Device G �

Table 8BTenant T-Fuse Pullout With Commercial Meter Socket

Ampere 3-Pole 2-PoleVolts Rating Catalog Number Catalog Number

240 100 T21003 T21002200 T22003 T22002

480 100 T41003 T41002200 T42003 T42002

Table 8ATenant Circuit Breaker With Commercial Meter Socket �

Table 8CTenant Vacu-Break Switch With Commercial Meter Socket

Ampere 3-Pole 2-PoleVolts Rating Catalog Number Catalog Number

240 100 V21003 V21002200 V22003 V22002

480 100 V41003 V41002200 V42003 V42002

� Select 100A and 200A circuit breakers from the same option. Do not mix breakers from different options.

240 VOLTS No.

Ampere Breaker ofOption Rating Frame Poles I.C. Catalog Number

01 100 BQ 2 10,000 BQ2B100CM3 10,000 BQ3B100CM

200 QJ2 2 10,000 QJ22B200CM3 10,000 QJ23B200CM

02 100 BQH 2 22,000 BQ2B100HCM3 22,000 BQ3B100HCM

200 QJH2 2 22,000 QJH22B200CM3 22,000 QJH23B200CM

03 100 HBQ 2 42,000 HB2B100CM3 42,000 HB3B100CM

200 QJ2-H 2 42,000 QJ22B200HCM3 42,000 QJ23B200HCM

04 100 ED4 2 65,000 ED42B100CM3 65,000 ED43B100CM

200 HED6 2 65,000 HFD62B200CM3 65,000 HFD63B200CM

05 100 HED4 2 100,000 HED42B100CM3 100,000 HED43B100CM

200 HFD6 2 100,000 HFD62B200CM3 100,000 HFD63B200CM

480 VOLTS

06 100 ED4 2 18,000 ED42B100CM3 18,000 ED43B100CM

200 FD6 2 18,000 FD62B200CM3 18,000 FD63B200CM


200 FD6 2 30,000 FD62B200CM3 30,000 FD63B200CM


200 HFD6 2 42,000 HFD62B200HCM3 42,000 HFD63B200HCM

09 100 CED6 2 65,000 CED62B100CM3 65,000 CED63B100CM

200 HFD6 2 65,000 HFD62B200CM3 65,000 HFD63B200CM

6

1. ScopeFurnish and install, as shown on the plans, a metering switchboard as specified herein, for the system indicated below:

� 120/240 � 1-phase � 3-wire� 208Y/120V � 3-phase � 4-wire� 480Y/277V � -phase � -wire � 480V � ____ V

2. ConfigurationThe switchboard enclosure shall be:

� Type 1 indoor � Type 3R outdoorconstruction construction

3. GeneralThe complete switchboard shall be phosphatized and finished withlight grey, ASA-61 paint.

Each switchboard section shall have a nameplate permanently affixed to it, listing the following information:

Name of manufacturer, System Voltage, Ampacity, Type,Manufacturer’s shop order number and date of manufacture.

Each section of switchboard shall be of the required number of vertical sections bolted together to form one metal enclosed rigidswitchboard. The sides, top and rear shall be covered with remov-able screw-on code gauge steel plates. Switchboard shall include all protective devices and equipment as listed on drawings with necessary interconnections, instrumentation and control wiring.

Switchboard shall be constructed in accordance with the latest NEMA PB-2 and UL 891 standards.

Meter sockets shall contain (test block) (lever bypass). Meter sockets shall be rated 200A continuous duty.

4. Incoming Service1. Underground Service:

To isolate incoming underground service conductors, an underground cable pull or auxiliary section shall be used. This section shall be of the � nonbussed, � bussed type and shall be sealable per local utility requirements, � utility terminating studs, � screw-type mechanical lugs, � com-pression lugs to terminate, � aluminum, � copper cable, shall be furnished as detailed on the plans.

2. Overhead Service: Cable entry� utility terminating studs, � screw-type mechanical lugs, � compression lugs to terminate, � aluminum, � copper cable shall be furnished as detailed on the plans. Where necessary provide top cable pull box which shall be sealable per local utility requirements.

5. Bus RequirementsThe bus shall be � tin plated aluminum, � silver plated copper of sufficient size to limit the temperature rise to 65ºC, based on UL tests.The bus shall be braced for � 50,000, � 75,000, � 100,000, � 200,000 amperes symmetrical and supported to withstand mechanical forces exerted during short circuit conditions when directly connected to a power source having the indicated availableshort circuit current. Provide a full capacity neutral when a neutral isindicated on the drawings.

The through bus on the end section shall be extended and pre-drilledto allow the addition of future sections with standard splice plates.

Grade 5 bolts will be used at bus joints. Ground bus and lugs shall be furnished — Ground bus shall extend the entire length of theswitchboard and shall be firmly secured to each vertical section.

6. Main Protective Device (Select one of Item #C)The main protective device, to be installed in the main device section, shall be as indicated below:C-1 Molded case circuit breaker shall be of the quick-make, quick-

break, trip-free, (heavy duty) (extra heavy duty) (solid state) type. It shall be an ______ frame (2-pole) (3-pole) 600-volt breaker with a trip unit rating of: � 400A, � 600A, � 800A, � 1000A, � 1200A, � 1600A, � 2000A, � 2500A, � 3000A of an interrupting capacity of not less than ______ amperes RMS symmetrical at the system voltage. The following accessory features are to be included: � Shunt Trip, � Electrical Operator, � Integral ground fault trip (for solid state Sensitrip II breakers only), � Other ______ (list).

C-2 Fusible switch of the quick-make, quick-break type. It shall be a (2-pole) (3-pole) (240V) (600V) Vacu-Break unit with a contin-uous current rating of (400) (600) (800) (1200) amperes and with ______ ampere class _____ fuses, suitable for application on a system with _____ amperes symmetrical available fault current.

C-3 Bolted pressure switch of the quick-make, quick-break type.It shall be � 2-pole, � 3-pole, � 240V, � 480V unit with a continuous current rating of: � 800A, � 1200A, � 1600A, � 2000A, � 2500A, � 3000A, � 4000A, and with ______ampere Class L fuses suitable for application on a system with ______ amperes symmetrical available fault current.

The following accessory features are to be included: � Shunt Trip, � Ground Fault Relay, � Electrical Operator, � Other ______ (list).

7. Tenant Branch Protective Devices (Select one of Item #D)All molded case circuit breakers, fusible switches, or fusible pulloutsused as a protective device in a branch circuit will meet the require-ments of the appropriate paragraph below.D-1 Molded case circuit breakers shall be of quick-make, quick-

break, trip-free thermal magnetic type with frame, trip and voltage ratings, either 2-pole or 3-pole, as indicated on the plans. All breakers shall have an interrupting capacity of not less than ______ amperes RMS symmetrical at the system voltage. All breakers shall be removable from the front of the switchboard without disturbing adjacent units. The switchboard shall have space or provisions for future units as shown on the plans.

D-2 Current limiting circuit breakers shall provide inverse time delay, instantaneous circuit protection, and also limit the let-through l2t of one-half cycle wave of the symmetrical prospective current without any fusible elements. Breakers shall have an interrupting capacity of not less than ______amperes RMS symmetrical at the system voltage.

D-3 Fusible switches shall be quick-make, quick-break units utilizing the double-break principle of circuit interrupting to minimize arcing and pitting and shall conform to the ratings shown on the plans. Each switch shall have an individual door over the front, equipped with a voidable interlock that prevents the door from being opened when the switch is in the ON position unless the interlock is purposely defeated by activation of the voiding mechanism. All switches shall have externally operated handles. Switches shall be equipped with � NEC standard, � Class R rejection type fuse holders, and Class � H, � RK1, � RK5, � J and � T fuses of ampere rating and type as indicated on the plans suitable for application on system with ______ ampere symmetrical available fault current.

D-4 Fusible pullouts for class T fuses.

SMM SwitchboardsGeneral Specifications

7

Siemens Energy & Automation, Inc.3333 Old Milton ParkwayAlpharetta, GA 30005

[email protected]

www.siemens.com/power

Order #SWSA-SMM01-0103 New 1.5M0103B&A Printed in USA

© 2003 Siemens Energy & Automation, Inc. All Rights ReservedSiemens is a registered trademark of Siemens AG. Vacu-Break is a registered trademark of Siemens Energy & Automation, Inc. Product namesmentioned may be trademarks or registered trademarks of their respective companies. Specifications are subject to change without notice.

SMM Switchboards - Siemensw3.usa.siemens.com/us/.../Switchboards/Switchboards/SMMS_A.pdfSMM Switchboards For EUSERC Utility Area Installations Select sockets with tenant mains for

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