Clearance Requirements For Use On Pad-Mounted Gear - S&C Loadbuster Instruction Sheet

Clearance
Requirements for Use
in Pad-Mounted Gear
For applications of the Loadbuster tool (catalog number 5300R3-E) in pad-mounted
gear, the Loadbuster tool must be equipped with an extended insulating hood (catalog
number NA-1034), and the pad-mounted gear must be equipped with rigid insulating
barriers to prevent:
• Accidental contact of the Loadbuster tool's metal parts with adjacent phases during
switching
• Accidental grounding of the Loadbuster tool's metal parts to enclosure walls, door
stiles, or switch mounting bases during switching
Specifically, barriers must ensure the mini mum clearances shown in Table 3 between
metal parts of the Loadbuster tool and ground during a switching operation.
Table 3. Minimum Barrier Clearances
Maximum System Operating Voltage, kV
Up through 15.5
Above 15.5 through 27
• Never position the Loadbuster tool so its outer tube obscures the line of vision. See
Figure 1 on page 10 for correct positioning.
• To coordinate the Loadbuster tool (catalog number 5300R3) maximum voltage
rating of 27 kV when used with fuse cutouts, disconnects, power fuses, or fuse limit-
ers made by other manufacture, the open gap on the cutout, discon nect, fuse, or fuse
limiter when the tool is ready to trip must approximate 3 inches (76 mm) minimum.
(For more details, see S&C Data Bulletin 811-60.)
To coordinate the Loadbuster tool's (catalog number 5400R3) maximum voltage rat-
ing of 38 kV when used with fuse cutouts, disconnects, power fuses, or fuse limiters of
other manufacture, the open gap on the cut out, disconnect, fuse, or fuse limiter when
the tool is ready to trip must approximate 5¼ inches (133 mm) minimum. (For a more
detailed discussion of this and other requirements, see S&C Data Bulletin 811-60.)
• After each operation, immediately remove the Loadbuster tool from the fuse cutout,
disconnect, power fuse, fuse lim iter, or pad-mounted gear and reset it. Instructions
for resetting the Loadbuster tool can be found in Step 5 on page 14.
A carrying case, catalog number 5380R1, is recommended for the Loadbuster
tool. The molded, high-density polyethylene carrying case protects the Loadbuster
tool against potentially damaging vibration, mechanical shock, and contamination
during storage or trans port.
Proper Application
Clearance, Inches (mm)
1 (25)
2 (51)
NOTICE
S&C Instruction Sheet 811-505 5