IEEE C57.12.28-2005 pdf free.IEEE Standard for P ad-Mounted Equipment一Enclosure Integrity.
4. Enclosure security
4.1 Test requirements
In addition to passing the tests defined in this standard, the construction of pad-mounted enclosures shall comply with the requirements of 4.1.1 through 4.1.9.
4.1.1 Enclosure mounting
The bottom edge of the enclosure shall provide for flush mounting on a flat, rigid mounting surface.
4.1.2 Water resistance
The enclosure shall restrict the entry of water (other than flood water) into the enclosure so as not to impair the operation of the apparatus inside.
4.1.3 Sharp corners
External sharp corners and projections shall be minimized.
4.1.4 Panel assembly
Panels shall be fastened or hinged to resist disassembly, breaking, or prying open from the outside with the doors in the closed and locked position. Normal entry shall be possible only with the use of proper access tools. There shall be no exposed screws, bolts, or other fastening devices that are externally removable (with the exception of pentahead bolts provided for extra security) that would provide access to energized parts in the enclosure.
4.1.5 Door hardware
Locking bolts and associated threaded receptacles, hinges, and hinge pins shall be AISI type 304 stainless steel or material of equivalent corrosion resistance.
4.1.6 Handhole covers
If handhole covers are exposed, they shall be secured from the inside of the enclosure.
4.1.7 Locking/latching devices
The latching device(s) shall be designed and constructed of such a material so as to resist breaking or bending. The provision for locking device(s) on the enclosure door(s) shall be designed and located as to comply with the defined tests.
4.1.8 Enclosure access
All access doors shall be fastened with a device that uses a pentahead tool to permit unlatching the door only after the padlock has been removed. This pentahead device or bolt shall be coordinated such that the padlock may not be inserted into the hasp until the access door is fully latched and the pentahead device is securely engaged.IEEE C57.12.28 pdf download.