622_50 (Switchgear Design Guide)

SelectionGuide Indoor and Outdoor Distribution (4.16 kv and 13.8 kv)Metal-Enclosed SwitchgearFor S&C System II ModularThe ModuleDATA BULLETIN 622-50

Page 1 of 24July 5, 1994

The Module Selection Guide

A System II module is one bay of a metal-enclosedswitchgear assembly-exactly as shown in SelectorCharts 1 through 4 of this data bulletin. All System IImodules are UL listed with Category B enclos

SM-4Z, SM-5S, or SM-5SS) Power Fuses.The 1200-ampere S&C Alduti-Rupter Switch is usedalone (unfused).The switch type and fuse type used in each module

are as shown in Selector Charts 1 through 4.Power-operated modules include Mini-Rupter

ower

-

er

with automatic motor charging of the quick-makequick-break mechanism after each operation. MS-2Switch Operators are drawout-mounted in the

of

infor

rgyr

ra-ke10eDeany

AS-30 Switch Operators are chair-coupled motor-driven switch operators used to provide Alduti-Rupter Switches with motor-driven opening andclosing. AS-30 Switch Operators are rigidly mountedin the switchgear stiling and are equipped with adecoupling feature. When applied with a Micro-AT

ished inrdination. compo-Switch-0. For

itchgear,

et

h

e

ehs

times theatings of of fuses,le fault-eres rmscal short-ratingstwice, asmmetricalted value,to carrySwitches alone or in combination with S&C PFuses, or Alduti-Rupter Switches alone, and profor one of the following optional S&C Switch Opewith optional S&C Automatic Control Equipment

MS-2 Switch Operators are high-speed storedswitch operators used to provide Mini-RuSwitches with both automatic solenoid trip-opautomatic solenoid trip-closed switch ope

The ratings for each module tabulated in SCharts 1 through 4 are based on the ratings of component in each module with the lowest Similarly, the ratings assigned to a complete aof S&C System II Modular Metal-Enclosed Switcare based on the ratings of the lowest-rated baassembly.

For modules that contain interrupter switchinterrupting ratings of the switches equal or the continuous ampere ratings of the modulshort-circuit ratings in Selector Charts 1 througexpressed in amperes rms symmetrical. Unles622-50 DATA BULLETINPage 2 of 24July 5, 1994visionsrators.energyptern andation

Source-Transfer Control, transfer is accompl3 seconds excluding any time delay for cooFor a complete description of these and all

nents in S&C System II Modular Metal-Enclosed gear, refer to S&C Descriptive Bulletin 622-3application information on metal-enclosed swrefer to S&C Data Bulletin 620-55.

lectorhe S&Crating.ssemblygear

y in the

s, theexceeds. The 4 are other-

wise noted, the asymmetrical ratings are 1.6 symmetrical values listed. The momentary rswitches and bus, and the interrupting ratingsequal or exceed these values. The duty-cycclosing ratings of switches expressed in ampasymmetrical equal or exceed the asymmetricircuit ratings. The duty-cycle fault-closing define the ability to close the switch once or specified, against a three-phase fault with asycurrent in at least one phase equal to the rawith the switch remaining operable and able and interrupt rated continuous current.construction or optional Category A enclosurstruction. Dimensions of each module and thtion of all basic components and optional featstandardized within the enclosure. The opfeatures are listed on pages 14 through 18 of bulletin and may be located in the enclosure incombinations as long as the basic componeoptions are installed in the standard locations.

S&C System II Modular Metal-Enclosed Switcfeatures:

The S&C Mini-Rupter Switch alone (unfused) or combination with S&C Fault Fiter Electronic PowerFuses or a choice of S&C Type SM (SM-20, SMuree con-e loca-ures aretionalthis data variousnts and

hgear

in

-40,

switchgear stiling to provide decoupling and easeinspection. When applied with an S&C Micro-AT

Source-Transfer Control, transfer is accomplished 10 cycles excluding any intentional time delay coordination.MS-10 Switch Operators are high-speed stored-eneswitch operators used to provide Mini-RupteSwitches with automatic solenoid trip-open opetion and with manual charging of the quick-maquick-break mechanism and manual closing. MS-Switch Operators are rigidly mounted on thswitchgear stiling. When applied with a Type ZSOvercurrent Relay or a Type SPD Open-PhasDetector, interrupting time is 4 cycles excluding intentional time delay for coordination.

e bottominal pad

rminationSelector Charts 1 through 4, on pages 6 throshow the available modules containing basic swfuse components in various combinations. A wid

of optional features is also available (see pathrough 18). Tailoring S&C System II Modular MEnclosed Switchgear to your requirements entathe selection and location of the proper moduoptional features to perform the required switchprotection functions. Approximate cable-termheights are tabulated in Selector Charts 1 thto aid in the selection of the module most apfor a given application, but are for estimating only. These heights are in inches (rounded

Sketch a one-line diagram of the required swassembly (as shown in the example at rigestablish the following:A. Nominal system voltage.B. Maximum available short-circuit curren

amperes rms symmetrical (allowing for antsystem growth).

C. Maximum continuous main-bus current.D. Need for switch operators (manual and p

operated modules can be intermixed).ugh 13,itch ande range

nearest 1) and represent the distance from thof the enclosure to the lower edge of the termor terminal-adapter plate. The actual cable-teges 14etal-ils onlyles anding andinationrough 4propriatepurposesto the

height available in any module may differ from thedimension listed if certain options or combinations ofoptions are included. The actual heights as well asanchor-bolt plans and locations of cable centerlines willbe shown on the CDA drawings prepared for eachspecific order for a switchgear assembly.

The following steps provide an easy-to-follow guidefor engineering the appropriate lineup for a giveninstallation.

itchgearht) and

t inicipated

ower-

DATA BULLETIN 622-50Page 3 of 24July 5, 1994


From the table below, determine the selector chartthan the values established in Step 1. Chart 3 appliescontaining modules with ratings equal to or greaterto the example shown in Step 1.

SELECTOR CHART TABLE

l

shown in the example below), and determine basicmodule numbers on the basis of:A. Function (entrance, feeder, auxiliary, and

metering).B. Basic Components (bus, interrupter switch, and

interrupter switch with fuses).C. One-Line Diagram (cable entrance and exit).D. Compact modules for cost savings and low

silhouette.

optionor a combination of options requires additionalheight, or where more cable-termination height isrequired. (See pages 19 and 20 for availability ofoptions and option combinations in compact anduniversal modules.)

F. Manual or Power Operated.

IMPORTANT: Compact and universal modules cannotbe intermixed, and all modules in a switchgear assemblymust be selected from the same selector chart.622-50 DATA BULLETINPage 4 of 24July 5, 1994* When using SELECTOR CHART 4, maximum voltage rating switchgear assembly is 15 kv when any module contains a 12Alduti-Rupter Switch. 15.5 kv when any module contains SM-5SFuses or optional Fusistor Units (included with optional fused votransformers and rollout carriages)

Now draw a layout of the switchgear assemof the* The asymmetrical short-circuit rating is 61,000 amperes rms00-ampereS Powertage

bly (asE. Universal modules for those cases where an

Refer again to the layout drawn in Step 3. Select therequired OPTIONAL FEATURES (see pages 14

through 18) and add appropriate symbols ordescriptions.

module and 3000 pounds for each 13.8-kv module.Check the minimum space requirements, remember-

ing that:

indoor,chgearration.)uld be

e 1 inch

4.16 kv

Space requirements for possible future additionsshould be considered.Draw a sketch of the switchgear assembdetermine its overall dimensions (as shownexample below). The height, depth, and width compact and universal modules are shownselector chart. The overall width of the assedetermined by adding the widths of the indmodules, obtained from the selector chart or front. views shown on page 24. For estimating in planning for loading on concrete pads, approximate weight of 2000 pounds for eachly and in thefor both in thembly isividual

from thepurposesuse an 4.16-kv

Modules can be placed against a wall or, ifback-to-back. (A plan view of the switassembly should be supplied for the configuMinimum room height above modules sho12 inches for ease of installation.Minimum lateral clearance at sides should bfor ease of installation.Minimum aisle width in front is 48 inches for and 60 inches for 13.8 kv.DATA BULLETIN 622-50Page 5 of 24July 5, 1994


RATINGS 4.16 Kv Nominal4.8 Kv Max60 Kv BIL600-Ampere Main Bus

Short-circuit rating of a switchgear assembly is that of the lowest-rated module in the assembly

See pages 21 through 23.

See page 24.IMPORTANT: When the switchgear asssembly includes only one

entrance module. select the interrupter switch with hinge end of switchconnected to the load side. When two or more entrance modules arerequired. select interrupter switches with hinge end of switch connectedto source side.

IMPORTANT: Where two or more entrance modules containing inter-rupter switches with fuses are used, optional key interlocks must beorderedto guard against access to fuses unless all entrance switches are open.

Side-by-side bus-tie modules cannot be accommodated.

Applicable to bus interconnection between indoor back-to-back lineups.

Primary bus supplied by S&C. mounting angles, fused voltagetransformers with primary leads. current transformers. and associatedsecondary wiring are available as listed in OPTIONAL FEATURES on pages14 through 18. For electric utilities only, unfused voltage transformerscan also be accommodated.

When an optional source-transfer control is specified, it will be locatedin the left-hand entrance module. For compact-height entrance modulescontaining Fault Fiter Electronic Power Fuses and all entrance modulescontaining SM-40 Power Fuses, the optional switch operator is mountedin the lower position on the right-hand stile whether or not an optionalMicro-AT Source-Transfer Control, Type SPD Open-Phase Detector, or TypeZSD Overcurrent Relay is furnished.

The asymmetrical short-circuit rating and onetime duty-cycle fault-closing rating is 61,000 amperes rms. The two-time duty-cycle fault-closingrating is 40,000 amperes rms asymmetrical.

If all entrance modules contain SM-5S Power Fuses, the short-circuitrating may be increased to 37,500 amperes rms symmetrical (270 Mva)

622-50 DATA BULLETINPage 6 of 24July 5, 1994



Short-circuit rating of a switchgear assembly is that of the lowest-See pages 21 through 23rated module in the assembly.

IMPORTANT: When the switchgear assembly includes only oneentrance module, select the interrupter switch with hinge end of switchconnected to the load side. When two or more entrance modules arerequired. select interrupter switches with hinge end of stitch connected

See page 24.

The asymmetrical short-circuit rating and one-time duty-cycle fault-closing rating is 61,000 amperes rms. The two-time duty-cycle fault-closingrating is 40,000 amperes rms asymmetrical

When an optional source transfer control is specified, it will be locatedIMPORTANT: Where two or more entrance modules containing inter-

rupter switches with fuses are used. optional key interlocks must. be orderedto guard against access to fuses unless all entrance switches arc open.

in the left-hand entrance module. For compact-height entrance modulescontaining Fault Fiter Electronic Power Fuses, the optional switch operatoris mounted in the lower position on the right-hand stile whether or notan optional Micro-AT Source-Transfer Control, Type SPD Open-Phase

Side by-side bus-tie modules cannot he accommodated Detector. or Type ZSD Overcurrent Relay is furnished

Applicable to bus interconnection between indoor back-to-back lineupsFor power-operated bus-tie applications, all other switches in the

Primary bus supplied by S&C; mounting angles, fused voltagetransformers with primary leads. current transformers. and associated

automatic source-transfer scheme must be Alduti-Rupter Switches withType AS-30 Switch Operators.

secondary wiring are available as listed in OPTIONAL FEATURES onpage, 14 through 18 Forelectric utilities only, unfused voltage transformerscan also be accommodated

The asymmetrical short-circuit rating is 61,000 amperes rms.




Short-circuit rating of a switchgear assembly is that of the lowest-rated module in the assembly

See pages 21 through 23.

See page 24.IMPORTANT: When the switchgear assembly includes only one

entrance module, select the interrupter switch with hinge end of switchconnected to the load side. When two or more entrance modules arerequired. select interrupter switches with hinge end of switch connectedto source side

IMPORTANT: Where two or more entrance modules containing inter-rupter switches with fuses are used, optional key interlocks must be orderedto guard against access to fuses unless all entrance switches are open

Side-by-side bus-tie modules cannot be accommodated

Applicable to bus interconnection between indoor back-to-hack lineups.

Primary bus supplied by S&C, mounting, angles. fused voltagetransformers with primary leads, current transformers. and associatedsecondary wiring are available as listed in OPTIONAL FEATURES on pages14 through 18 For electric utilities only, unfused voltage transformerscan also be accommodated

When an optional source-transfer control is specfied, it will be locatedin the left-hand entrance module. For compact height entrance modulescontaining Fault Fiter Electronic Power Fuses, the optional switch operatoris mounted in the lower position on the right-hand stile whether or notan optional Micro-AT Source-Transfer Control. Type SPD Open-PhaseDetector, or Type ZSD Overcurrent Relay is furnished.

The asymmetrical short-circuit rating and one-time duty-cycle fault-closing rating is 61,000 amperes rms. The two-time duty-cycle fault-closingrating is 40,000 amperes rms asymmetrical.

Type SM-20 Power Fuses are also available in ratings through 200K.

If all entrance modules contain Fault Fiter Electronic Power Fuses,the short-circuit rating may be increased to 40,000 amperes rmssymmetrical (960 Mva).

622-50 DATA BULLETINPage 10 of 24July 5,1994



Short-circuit rating of a switchgear assembly is that of the lowest-rated module in the assembly.

Maximum rating of the switchgear assembly is 15 kv when any modulecontains a 1200 ampere Alduti-Rupter Switch. 15.5 kv when any modulecontains SM-5SS Power Fuses.

IMPORTANT When the switchgear assembly includes only oneentrance module, select the interrupter switch with hinge end of switchconnected to the load side. When two or more entrance modules arercquired, select interrupter switches with hinge end of switch connectedto source side

IMPORTANT Where two or more entrance modules containing inter-rupter switches with fuses are used, optional key interlocks must he orderedto guard against access to fuses unless all entrance switches are open

Side-by-side bus-tie modules cannot he accommodated

Applicable to bus interconnection between indoor back-to-back lineups.

Primary bus supplied by S&C; mounting angles, fused voltagetransformers with primary leads, current transformers, and associatedsecondary wiring are available as listed in OPTIONAL FEATURE on pages14 through 18. For electric utilities only, unfused voltage transformersran also be accommodated.

See pages 21 through 23

See page 24

The asymmetrical short-circuit rating and one-time duty-cycle fault-closing rating is 61,000 amperes rms The two-time duty-cycle fault closingrating is 40,000 amperes rms asymmetrical

When an optional source-transfer control is specified, it will he locatedin the left-hand entrance module For compact-height entrance modulescontaining Fault Fiter Electronic Power Fuses. the optional switch operatoris mounted in the lower position on the right-hand stile whether or notan optional Micro-AT Source-Transfer Control. Type SPD Open-PhaseDetector, or Type ZSD Overcurrent Relay is furnished.

Type SM-20 Power Fuses are also available in ratings through 200K

The asymmetrical short-circuit rating and one-time duty cycle fault-closing rating is 54,000 amperes rms. The two-time duty cycle fault-closingrating is 40,000 amperes rms asymmetrical

For power-operated bus-tie applications, all other switches in theautomatic source-transfer scheme must he Alduti-Rupter Switches withType AS-30 Switch Operators.

The asymmetrical short-circuit rating is 61,000 amperes rms


DATA BULLETIN 622-50Page 13 of 24

July 5, 1994


OPTIONAL FEATURES

Not available on 30-inch wide modules


OPTIONAL FEATURESContinued

See pages 19 and 20 for availabilty of these options and option


July 5, 1994


OPTIONAL FEATURES-Continued

See pages 19 and 20 for availability of these options and optioncombinations.

Not available in 30-inch wide modules.

a separate conduit. The CTs can be relocated in the field to a positionapproximately 13 inches from the bottom of the enclosure, accommodatinginstallations where the three conductors are in a single conduit. The modulecable-termination height is reduced accordingly. Thus, for certain modules,

These CTs are mounted approximately 6 inches from the bottom ofa cable pit. may be required. For details, contact the nearest S&C Salesthe enclosure, accommodating installations where each conductor is inOffice with descriptions of cable and terminator.


OPTIONAL FEATURES Continued

See pages 19 and 20 for availability of these options and optioncombinations

July 5, 1994Page 17 of 24

DATA BULLETIN 622-50


OPTIONAL FEATURES - Continued

Not available in modules 30 inches in width.

Available March 1995


S&C System II Modular Metal-Enclosed Switchgear isavailable in compact and universal heights. Compactheight offers the economy of low cost, features lowsilhouette, and permits inclusion of most options. Forthose cases where options or combinations of optionsare not available in compact modules, or wherecompact modules do not offer sufficient cable-termination height, universal height is used. For easein selecting the proper height, the tables below andon page 20 set forth the availability of certain optionsor option combinations in specific modules. For

available cable-termination height in each module, referto the applicable selector chart.

The table below sets forth the availability of certainoptions in the various types of modules at compactand universal heights. Options not listed in this tableare available in modules of either height.

The table on page 20 sets forth the availability ofcertain option combinations in the various types ofmodules at both compact and universal heights. Forother combinations, consult the nearest S&C SalesOffice.

AVAILABILITY OF OPTIONS

Except bus-tie modules, in which case none of these options can beaccommodated.

These, CTs are mounted approximately 6 inches from the bottom ofd

co.at

Entrance modules with Fault Fiter Electronic Power Fuses only. Forthese modules, one fused voltage transformer wired phase-to ground canbe accommodated.

s.

ded as Power

h 4 toze beingthe enclosure, accommodating installations where each cona separate conduit. The CTs can be relocated in the field toapproximately 13 inches from the bottom of the enclosure, acinstallations where the three conductors are in a single conduitcable-termination height is reduced accordingly. Thus. for certa cable pit may be required. For details. contact the nearesOffice with descriptions of cable and terminator.

Included as standard on 1200-ampere switches.uctor is ina positionmmodating

The modulein modules,S&C Sales

Only feeder modules and only distribution class surge arrester

Only entrance modules containing a switch with fuses. Inclustandard in entrance modules containing Fault Fiter ElectronicFuses.

Check cable-termination height in Selector Charts 1 througdetermine if there is sufficient space for the cable type and siused.

Only bus-tap metering, modules.

Except 3-element switchboard-type kilowatt-hour meters.

For feeder modules, only distribution class surge arresters.DATA BULLETIN 622-50Page 19 of 24

July 5, 1994

AVAILABILITY OF OPTION COMBINATIONS


Except bus-tie modules,in which case none of these options can heaccommodated

Not applicable to unfused voltage transformers

These CTs are mounted approximately 6 inches from the bottom ofthe enclosure, accommodating installations where each conductor is ina separate conduit. The CTs can he relocated in the field to a positionapproximately 13 inches from the bottom of the enclosure, accommodatinginstallations when the three conductors are in a single conduit. The modulecable-termination height is reduced accordingly Thus, for certain modules,

a cable pit may be required. For details. contact the nearest S&C SalesOffice with descriptions of cable and terminator. Wound-type currenttransformers cannot be accommodated.

Any two of the three listed components can be accommodated

Surge arresters and window-type current transformers are availableonly in bus-tap metering modules,

Only bus-tap metering modules.

For feeder modules, only distribution class surge arresters.


* Modules rated 1200 amperes include two cables per phase.


July 5, 1994


* Modules rated 1200 amperes include two cables per phase.


* Modules raced 1200 amperes include two cables per phase.


July 5, 1994


622-50Page 24 of 24July 5, 1994

DATA BULLETIN

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622_50 (Switchgear Design Guide)

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