2.4.3
Rectifying Elements
Provide silicon diode rectifying elements, connected in such manner as to
provide full-wave rectification. [Silicon diodes shall be protected by
selenium cells or varistors against overvoltage surges and by current
limiting devices against overcurrent surges.]
[2.4.4
Enclosure
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NOTE: Choose this paragraph for air cooled
rectifier enclosures or the paragraph below entitled
"Oil Immersed Enclosures." Oil immersed enclosures
shall be used where highly corrosive atmospheres
exist. When locating oil immersed rectifiers near
buildings, consult with paragraph 3.2.3 of MILHDBK
1008C for fire safety requirements.
**************************************************************************
NEMA ICS 6, Type [3] [3X] [4X] [7] [_____], suitable for [wall] [post]
[pad] mounting. Enclosure shall include hinged door with [padlock hasp]
[key lock, provide [three] [_____] keys.] [Enclosure locks shall be keyed
alike.] Fit enclosure with screened openings to provide for cooling by
natural convection. Provide holes, conduit knockouts and threaded hubs of
sufficient size and location. The cabinet and mounting support shall be
[painted] [hot-dipped galvanized] [stainless] steel [according to the
manufacturer's standards].
][2.4.5
Oil Immersed Enclosures
Provide enclosures of 11-gage steel or heavier, with an accessible drain
plug. Provide a hinged lid with quick release clamps to secure it in a
closed position. The oil level shall be clearly marked. Provide a
compressive, oil resistance, positive sealing gasket. Based mounting shall
have 100 mm 4 inch high channels. Provide an internal terminal board and
connections above oil level for monitoring and adjustment. The cabinet and
mounting support shall be [painted] [hot-dipped galvanized] [stainless]
steel [according to the manufacturer's standards].
]2.4.6
Wiring and Schematic Diagram
Provide a complete wiring and schematic diagram of the power unit showing
both the A.C. and the D.C. connections to anodes on the inside of the
cabinet door. Show and label components.
2.4.7
Overload and Short Circuit Protection
UL 489, single-pole, flush-mounted molded case circuit breaker, [magnetic]
[thermal-magnetic] type, shall be installed in the primary circuit of the
rectifier supply transformer.
2.4.8
D.C. Output Control
D.C. output voltage shall be adjustable by [transformer taps] [automatic
controls].
SECTION 13112N
Page 12
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