Page 1: Table Of Contents
Manual PMH Pad- Mounted Gear Outdoor Distribution (14.4 kV and 25 kV) Operation Table of Contents Section Page Section Page Introduction Switching with Uni-Rupter® Interrupters Qualified Persons ......2 Installing and Closing the Fuse .
Page 2: Introduction
Introduction Qualified Persons WARNING Only qualified persons who are knowledgeable in the installation, operation, and maintenance of overhead and underground electric distribution equipment, along with all associated hazards, may install, operate, and maintain the equipment covered by this publication. A qualified person is someone who is trained and competent in: •...
Page 3: Warranty Qualifications
Introduction Warranty The seller’s warranties do not apply if fuse units, fuse-unit end- ttings, holders, re ll units, or switch blades of other than S&C manufacture are used in conjunction with Qualifications S&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 Electronic Power Fuse Mountings and S&C Holders designed therefore, or if current-limiting fuses are applied other than as set forth...
Page 4: Safety Information
Safety Information Understanding Several types of safety-alert messages may appear throughout this instruction sheet and on labels and tags attached to Manual PMH Pad-Mounted Gear. Familiarize yourself with Safety-Alert these types of messages and the importance of these various signal words: Messages DANGER “DANGER”...
Page 5: Location Of Safety Labels
Safety Information Location of Safety Labels DANGER KEEP AWAY Ç DANGER Hazardous voltage—more than 4000 volts. Failure to follow these instructions will likely cause shock, burns, or death. • ALWAYS consider all circuits and component parts live until completely de-energized, tested, grounded, and tagged or properly identiﬁed.
Page 6 Safety Information Ç Location of Safety Labels DANGER DANGER KEEP AWAY Hazardous voltage—more than 4000 volts. Failure to follow these instructions will likely cause shock, burns, or death. • ALWAYS consider all circuits and component parts live until completely de-energized, tested, grounded, and tagged or properly identiﬁed.
Page 7: Safety Precautions
Safety Precautions DANGER Pad-mounted gear contains high voltage. Failure to observe the precautions below will result in serious personal injury or death. Some of these precautions may differ from company operating procedures and rules. Where a discrepancy exists, users should follow their company’s operating procedures and rules.
Page 8: Overview
Overview Penta-Latch® Mechanism provides automatic three-point door latching—only after the actuator is secured can a padlock be installed. Dual-purpose front barriers guard against inadvertent contact with live parts when in a normal vertical position. Inserted into the open gap of a fuse, the barrier provides isola tion from bus and upper contacts.
Page 9 Overview Viewing window for visible verification of the switch position Left-hand door retainer—Rotate the latch is removable for phasing. To remove the window, loosen the upward to open the door. To secure the left-hand wing-head screws and lift the window off the alignment bolts. door closed, rotate the latch downward over the stop mounted on outer edge of the door.
Page 10: Enclosure Doors
Enclosure Doors DANGER When access to high-voltage compartments is required for inspection, service, or repairs, always observe the precautions below. Failure to observe these precautions may result in serious personal injury or death. 1. Access to pad-mount gear must be restricted only to qualified persons.
Page 11 Enclosure Doors Complete the following steps to close and lock the doors: STEP 1. Lift the door holder up to allow the door to swing closed. See Figure 6. Make sure the door holder is placed back in the storage position to allow the door to be fully closed.
Page 12: Switching With Mini-Rupter® Switches
Switching with Mini-Rupter Switches ® Operating the Mini-Rupter Switch Hood shields padlock The Mini-Rupter Switch is a three-pole, 600-A switch used shackle to switch between power sources. The operating shaft used to control the switch is located on the same side of the enclosure with respect to the switch location.
Page 13: Front Barriers
Switching with Mini-Rupter Switches ® Front Barriers Before proceeding with the instructions on handling the front barriers, refer to the “DANGER” message on page 7. S&C recommends the dual-purpose front barrier be inserted into the “Slide-in” position when the Mini-Rupter Switch is open.
Page 14 Switching with Mini-Rupter Switches ® If the Mini-Rupter Switch is inadvertently closed with the front barrier in the “Slide-in” position, it will be neces- sary to unblock the blades. To do this, rotate the switch- operating handle all the way to the Open position. This will return the blades to the Open position.
Page 15: Fusing
Fusing Manual PMH Pad-Mounted Gear is furnished with S&C Fuse Mountings with Uni-Rupter Interrupters that accommodate Type SML-20 Power Fuses, Type SML-4Z Power Fuses, or Fault Fiter Electronic Power Fuses. Fault Fiter Electronic Power Fuse Mountings also accommo date a variety of current-limiting fuses. WARNING When selecting...
Page 16: Switching With Uni-Rupter® Interrupters
Switching with Uni-Rupter Interrupters ® Installing and Closing the Fuse Door holder S&C Grappler tool Before proceeding with the instructions on installing and in storage position closing the fuse, refer to the “DANGER” message on page 7. WARNING Always use a Grappler Handling Tool attached to a suitable universal pole to install, remove, open, or close a fuse.
Page 17 Switching with Uni-Rupter Interrupters ® 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 for more than one week. These barriers are intended for temporary use only to iso late the fuse from the main contacts of the Uni-Rupter Interrupter while work is being performed.
Page 18 Switching with Uni-Rupter Interrupters ® STEP 5. If a dual-purpose front barrier is in the “Slide-in” posi tion, use the Grappler tool to remove it. See Figure 21. DANGER Because there is always the possibility of closing the fuse into a faulted circuit, and because the closing operation is completely operator-dependent (with no assist from a quick-make mechanism), the clos ing...
Page 19: A Note On Single-Pole Switching
Switching with Uni-Rupter Interrupters ® Preferred Acceptable Uni-Rupter Figure 22. Closing the fuse with a swift, unhesitating stroke. The upper left inset shows a close-up of a Grappler tool in the preferred position to close the fuse. The upper right inset shows a close-up of a Grappler tool in an acceptable position to close the fuse.
Page 20: Opening And Removing The Fuse
Switching with Uni-Rupter Interrupters ® Opening and Removing the Fuse Before proceeding with the instructions on opening and removing the fuse, refer to the “DANGER” message on page 7. WARNING Always use a Grappler Handling Tool attached to a suitable universal pole to install, remove, open, or close a fuse.
Page 21 Switching with Uni-Rupter Interrupters ® STEP 4. Pull the fuse vigorously through its full travel without hesitation at any point. See Figure 24. A downward force should be maintained on the universal pole through the fuse-opening operation to counteract any tendency the fuse may have to bounce toward the Closed position.
Page 22 Switching with Uni-Rupter Interrupters ® DANGER Make sure the fuse is kept away from the con tacts of the Uni-Rupter Interrupter during removal of the fuse from its hinge to prevent reestablishment of the cir cuit. S&C recommends the associated dual- purpose front barrier be placed in the “Slide-in”...
Page 23: Re-Fusing
Re-Fusing How to Detect and Replace fuse be inverted during handling. The fuse condition a Blown Fuse can be veri fied by returning the fuse to the upright posi- Open the appropriate fuse-compartment door and secure tion. If the fuse is blown, the target will remain in the it with the door holder.
Page 24: Components
Maintenanceé Components Returning Equipment to Service No mechanical maintenance is required for S&C Manual When returning the equipment to service, observe the PMH Pad-Mounted Gear. However, occasional inspection following procedures : of the gear and exercising of the Mini-Rupter Switches is STEP 1.
Page 25: Enclosure Finish
Maintenance Enclosure Finish The responsibility for ensuring that a finish protects the enclosure lies with both the manufacturer and the user. Manual PMH Pad-Mounted Gear is nished with the Ultradur® II Outdoor Finish, which provides lasting protection for the enclosure. To retain this protection, the user should take periodic corrective action as fol lows: STEP 1.
Page 26: Dielectric Testing
Appendix A Dielectric Testing For the convenience of users who normally perform elec- trical tests on system components such as pad-mounted gear, appropriate withstand test values are given in Table 1. Table 1. Ratings and Insulation Test Values Rating, kV Withstand, kV Nom.
Page 27: Ratings For S&C Mini-Rupter Switches
Appendix B Ratings for S&C Mini-Rupter Switches systems rated higher than 7.2 kV and involving load current with high harmonic content (such as recti er load Complete ratings for Mini-Rupter Switches as applied currents), refer to the nearest S&C Sales Of ce. The three- in S&C Manual PMH Pad-Mounted Gear are shown in time duty-cycle fault-closing ratings shown for Mini-Rupter Table 2.
Page 28: Optional Features
Appendix C Table 4. Optional Features Suffix to be Added to Item Pad-Mounted Applicable to Models Gear Catalog Number Light gray outdoor Ultradur II Outdoor Finish instead of olive green All models Equipment green outdoor finish (Toronto standard) instead of olive green All models Seafoam green outdoor finish instead of olive green All models...
Page 29 Appendix C Table 4. Optional Features—Continued Suffix to be Added to Item Pad-Mounted Gear Applicable to Models Catalog Number 6 inches (152 mm) All models 12 inches (305 mm) All models Carbon steel 18 inches (457 mm) All models Base spacer, compartmented to match 24 inches (610 mm) All models enclosure, increases cable-termination...
Page 30 Appendix C Table 4. Optional Features—Continued Suffix to be Added to Item Pad-Mounted Gear Applicable to Models Catalog Number 9 kV, 10 kV, or 9/10 kV All models Mounting Provisions for Base-Mounted 12 kV All models Surge Arresters , at switch terminals and ①...
Page 31: Current-Limiting Fuses For Use In S&C Pmh Pad-Mounted Gear
Appendix D Current-Limiting Fuses for Use in S&C PMH are equipped with ⅝-inch (16-mm) diameter mounting studs at both ends. Depending on the length and diameter Pad-Mounted Gear of the current-limiting fuse to be used, adapters may be required in order to t the fuse in the holder. Adapters, Types Accommodated and Adapters Required when required, are furnished with the S&C Holder and are S&C Holders for current-limiting fuses are designed for use...
Page 32: Recommended Voltage Ratings
Appendix D Recommended Voltage Ratings In general, current-limiting fuses should have a maximum voltage rating equal to, but not greater than 140% of, the system line-to-line voltage because, for most applications, the fuses can be exposed to full system line-to-line voltage in clearing faults.

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S&C PMH Series Operation

Table of Contents

Introduction

Safety Information

Safety Precautions

Overview

Enclosure Doors

Switching with Mini-Rupter® Switches

Fusing

Switching with Uni-Rupter® Interrupters

Re-Fusing

Maintenance

Appendix A

Appendix B

Appendix C

Appendix D

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