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   S&C Instruction Sheet 662-510   

9

Overview

Viewing window for visible verification of the switch position 
is removable for phasing. To remove the window, loosen the 
wing-head screws and lift the window off the alignment bolts.

Left-hand door retainer—Rotate the latch 
upward to open the door. To secure the left-hand 
door closed, rotate the latch downward over the 
stop mounted on outer edge of the door.

Ground pad on the inside at 
the bottom the door stile in each 
compartment accommodates 
con nectors for attachment of cable 
concentric-neutral ground leads 
and ground studs.

Main bus

Door holder

Ground 

studs

Optional fuse-

storage feature

Circuit diagram

Interphase and end-barriers for 14.4-kV 
gear; the end-barrier is provided with the 
optional fuse-storage feature only.

S&C Mini-Rupter Switch—Manually operated switches 
are furnished with a manual operating handle that folds for 
storage behind the switch operating-hub cover.

Dual-purpose front barrier guards against inadvertent 
contact with live parts when in a normal vertical position. 
Inserted into the open gap of a switch, the barrier 
provides isola tion from bus and upper contacts.

Instruction 

manual 

holder

Optional mounting provisions for

user-supplied fault indicators

Figure 2.  Switch-side view of a Model PMH-9.

Summary of Contents for PMH Series

Page 1: ...and Closing the Doors 10 Switching with Mini Rupter Switches Operating the Mini Rupter Switch 12 Front Barriers 13 Fusing Assembling the Fuse 15 Installing the Fuse in the Mounting 15 Switching with...

Page 2: ...trieve and refer to this publication Proper Application WARNING The equipment in this publication is only intended for a specific application The application must be within the ratings furnished for t...

Page 3: ...C SML Mountings Nor do the seller s warranties apply if other than Fault Fiter Electronic Power Fuses S C Switch Blades or selected current limiting fuses are used in conjunction with S C Fault Fiter...

Page 4: ...tions are not followed NOTICE NOTICE identifies important procedures or requirements that can result in product or property damage if instructions are not followed Following Safety Instructions If you...

Page 5: ...EITHER RECEIPT NOR POSSESSION THEREOF INFERS OR TRANSFERS ANY RIGHT IN OR LICENSE TO USE THIS DOCUMENT THE SUBJECT MATTER THEREOF OR ANY DESIGN OR TECHNICAL INFORMATION SHOWN THEREON OR ANY RIGHT TO R...

Page 6: ...arts live until completely de energized tested grounded and tagged or properly identified Do not work on or near this equipment unless you 1 Know and obey your employer s work rules and S C s instruct...

Page 7: ...s of the pad mounted gear enclosure They must be closed and padlocked at all times unless the switches are being operated 8 ENERGIZED TERMINALS Always assume both sets of power terminals on any Mini R...

Page 8: ...n and phase identification labels Uni Rupter Interrupter Storage rack holds up to six SM 4 Refill Units or three SMU 20 Fuse Units Ground studs Interphase and end barriers Fault Fiter Electronic Power...

Page 9: ...ure Circuit diagram Interphase and end barriers for 14 4 kV gear the end barrier is provided with the optional fuse storage feature only S C Mini Rupter Switch Manually operated switches are furnished...

Page 10: ...s 7 Make sure the enclosure is properly grounded to the station or facility ground Do not return equipment to service unless such grounds are properly made Opening and Closing the Doors Complete the f...

Page 11: ...en the door is closed To close a door equipped with the Penta Latch Mechanism place one hand at the midpoint of the door front near the edge and firmly push the doorclosed Whenthelatchpointsarepositiv...

Page 12: ...tch and check the switch position indicator to verify the switch is in the desired position STEP 4 Follow the instructions to open the enclosure doors on page 10 STEP 5 Check the physical position of...

Page 13: ...rong Station prong WARNING Dual purpose front barriers must be wiped clean before placing them in the Slide in position In addition do not leave dual purpose front barriers in the Slide in position fo...

Page 14: ...y and carefully withdraw the barrier with the Grappler tool s prong pointed upward as shown in Figure 14 so that as it clears the Slide in position the hooks on the gear settle into the holes in the b...

Page 15: ...end fittings an SM 4 Refill Unit into each holder or a Fault Fiter Interrupting Module and Control Module into each holder in accordance with the instruction sheet furnished with the fuse unit refill...

Page 16: ...ional inner barrier panels catalog number suffix G7 are furnished loosen the pentahead bolts and remove the panel Then remove only the dual purpose front barrier associated with the fuse mounting into...

Page 17: ...ppler tool c Lift the fuse and lower it into its hinge See Figure 19 Make sure the fuse is securely seated in the hinge and then disengage the Grapplertoolfromthefuse SeeFigure20on page 18 DANGER Make...

Page 18: ...fuse See inset of Figure 22 on page 19 Then with one s face turned away close the fuse with a swift unhesitating stroke See Figure 22 on page 19 If space is tight between the pull ring of the fuse an...

Page 19: ...ccur only switch three phase loads with the Uni Rupter Interrupter where each phase is carrying 5 or more of the rated connected load current Do not switch unloaded three phase transformers with the U...

Page 20: ...e to high voltage STEP 2 If optional inner barrier panels catalog number suffix G7 arefurnished loosenthepentahead bolts and remove the panel Then remove only the dual purpose front barrier associated...

Page 21: ...are in the Open position If the door is closed it will strike the fuse pull ring The door may be closed if the fuse is removed from its mounting STEP 6 S C recommends the dual purpose front barrier as...

Page 22: ...y should be stored in a clean dry location Do not store end fittings holders interrupting modules or current limitingfusesinhigh voltagecompartments unless the unit is equipped with the optional fuse...

Page 23: ...se to the upright posi tion If the fuse is blown the target will remain in the extended projecting position Remove the blown fuse from its mounting following the instructions found in the Opening and...

Page 24: ...RNING Dual purpose front barriers for switch and fuse compartments should be inserted into the open gap of the Mini Rupter Switch or fuse to provide physical isolation for additional security in the e...

Page 25: ...9999 058 for olive green finish 9999 080 for light gray finish and 9999 061 for red oxide primer No other finish or primer is approved The area to be touched up should be cleaned to remove all oil an...

Page 26: ...0 seconds The column headed Dc is given as a reference only for those making dc tests and represents values believed to be appropriate and approximately equivalent to the corresponding power frequency...

Page 27: ...ing currents associated with the applicable loads as well as line charging and cable charging currents typical for distribution systems of these voltage ratings For applications on Ratings for S C Pow...

Page 28: ...1 All models except PMH 4 With viewing window in door F2 All models except PMH 4 Inner barrier panels a panel inside the enclosure door for each compartment secured by recessed pentahead bolt s G7 All...

Page 29: ...mil M2 All models In fuse compartments For conductor sizes No 2 through 4 0 M3 PMH 4 5 6 11 19 PMH 7 8 9 PMH 12 Polymer housed metal oxide surge arresters base mounted at switch terminals and bus term...

Page 30: ...ductor UD cable at all cable connected switch terminals and bus terminals G W PSC for No 6 through 2 0 or G W PAT for No 4 through 250 kc mil copper or aluminum cable U2 All models G W PAT for 3 0 thr...

Page 31: ...o be purchased from the appropriate current limiting fuse manufacturer The maximum voltage and maximum ampere ratings listed in this table apply when the corresponding current limiting fuse is used Co...

Page 32: ...line to ground voltage i e fuses with a voltage rating lower than line to line voltage but greater than or equal to maximum system line to ground voltage S C can only recommend such use in the follow...

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