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NEMA ICS 6, Type [3] [3X] [4] [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].
][2.3.5
Oil Immersed Enclosures
Provide enclosures of 11-gage steel or heavier, with an accessible drain
plug. The oil level shall be clearly marked. Provide a hinged lid with
quick release clamps to secure it in a closed position. Provide a
compressive, oil resistant, positive sealing gasket. Base 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].
]2.3.6
Overload and Short Circuit Protection
UL 489, Molded case circuit breaker, [magnetic] [thermal-magnetic] type.
2.3.7
D.C. Output Control
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NOTE: A minimum of five coarse and five fine taps
is recommended to provide sufficient voltage
adjustment. Variacs should not be used where
subjected to corrosive or marine air atmospheres.
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D.C. output voltage shall be adjustable. Transformer taps, [5] [_____]
coarse, [[5] [_____] fine.] [Variac.] [_____].
2.3.8
Output Voltage and Current Metering
Provide separate panel voltmeter and ammeter, not less than 63.5 mm 2 1/2
inch [rectangular] [round], two percent full scale accuracy [at 30 degrees C
80 degrees F, temperature stability above and below 30 degrees C 80
degrees F of at least one percent per 5 degrees C 10 degrees F]. Provide an
"ON-OFF" toggle switch for each meter.
2.3.9
Surge Protection
Protect silicon diodes by use of AC and DC lightning arresters or metal
oxide varistors against overvoltage surges and by current-limiting device
against overcurrent surges.
2.3.10
Efficiency
Overall efficiency of [65 percent] [90 percent] [_____] minimum when
operated at full output.
SECTION 13111N
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