S&C PMH Inspection Manual

4 S&C Instruction Sheet 663-590
Safety Precautions
DANGER
S&C Source-Transfer PMH Pad-Mounted Gear operate at
high-voltage. Failure to observe the precautions below
will result in serious personal injury or death.
Some of these precautions may differ from your
company’s operating procedures and rules. Where a
discrepancy exists, follow your company’s operating
procedures and rules.
1. Qualified Persons.
Access to the S&C
Source-Transfer PMH Pad-Mounted
Gear must be restricted only to qualified
persons. See “Qualified Persons” on page 2.
2. Safety Procedures. Always follow safe operating
procedures and rules. Always maintain proper clear-
ance from energized components.
3. Doors. High-voltage compartment doors must be
securely closed and latched, with padlocks in place
at all time unless work is being performed inside the
enclosure. Mini-Rupter Switches have switch-oper-
ating-shaft access covers located on the sides of the
pad-mounted gear enclosure. They must be closed
and padlocked at all times unless the switches are
being operated.
4. Key Interlocks. Optional key interlocks, if furnished,
must be in place. Check the operating sequence of key
interlocks to verify proper sequencing. After the pad-
mounted gear is installed, destroy all duplicate keys or
make them accessible only to authorized persons so
that the key-interlock scheme will not be comprised.
Key interlocks are not security locks and are not substi-
tutes for padlocks.
5. Opening Doors. Do not apply any undue force when
attempting to open a door. The use of undue force may
damage the door-latching mechanism. If optional key
interlocks are provided, make certain that the interlocks
are in their correct positions to allow door opening.
6. Safety Labels. Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or “NOTICE”
labels.
7. Personal Protective Equipment. Always use suitable
protective equipment such as rubber gloves, rubber
mats, hard hats, safety glasses, and arc-flash cloth-
ing in accordance with safe operating procedures and
rules, especially when handling fuses and barriers
within high-voltage compartments.
8. Grounding. The S&C Source-Transfer PMH Pad-
Mounted Gear enclosure must be connected to a
suitable earth ground before energizing, and at all
times when energized.
9. Fuses. Make certain that fuses are disconnected from
all power sources (including backfeed) before being
inspected or replaced.
10. Mini-Rupter Switches. Always confirm the open/close
position of Mini-Rupter Switches by visually observing
the position of the switch blades.
11. Energized Components. Always assume that both
terminals of any switch or fuse are energized unless
proved otherwise by test, by visual evidence of open-
circuit conditions on both terminals, or by observing
that both terminals are grounded.

S&C PMH Specifications

General

Brand	S&C
Model	PMH
Category	Controller
Language	English