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Enclosure Security
S&C PMX Switchgear incorporates many provisions to minimize hazards to qualifi ed
persons and to the general public. Each module is fabricated from 11-gauge steel sheet and
is free-standing, and self-supporting. There are always double walls between adjoining
modules. Provisions for future bus extension are closed with a panel that is secured
internally.
Doors are constructed of 11-gauge hot-rolled, pickled and oiled steel sheet. Door-edge
fl anges overlap with door-opening fl anges and are formed to create a mechanical maze
that guards against water entry and discourages tampering or insertion of foreign objects,
but allows ventilation to help keep the enclosure interior dry. Each door is equipped with
a door handle. The door handle is padlockable and incorporates a hood to protect the
padlock shackle from tampering.
Access Control
Access is from the front and rear only. Doors providing access to power fuses are mechan-
ically or key interlocked with the associated interrupter switch. Doors and hinged-bolted
panels providing access to high-voltage components are provided with fl ush-mounted
key-operated snaplocks and have provisions for padlocking. In addition, the hinged-bolted
panels are secured by a pentahead bolt provided with a protective hood, midway between
the top and bottom of the panel. Hex bolts are provided to secure the door near the top
and bottom.
SAFETY INFORMATION
