Location Considerations
2.0LOCATION CONSIDERATIONS
The STS2/PDU should be placed in a clean, cool and dry location. The 250A unit without an output cabinet requires only front access for installation and maintenance. Both front and side access are required for installation and maintenance of
Adequate space is required above the unit for conduit (if configured as such) and cooling air flow. This section provides specific information for these considerations.
The unit is designed with top and bottom cable terminations to allow maximum flexibility in its installation. Units with output inline panelboards are bottom exit only. If bottom cable entry and exit is used, sufficient cable bending space must be provided by a raised floor or a floor stand.
For dimensions of each unit, see Figures 7 through 22. If your unit is equipped with an optional key lockout switch, see Figures 13 through 21 for the location of that switch.
2.1Recommended Minimum Service Clearances
The recommended service clearances are at the front and side, if equipped with output cabinet. The minimum service clearance required by the National Electrical Code (NEC) Article
36 in. (91cm) for units with voltages up to 150V to ground and 42 in. (107cm) for units with voltages over 150V to ground. Clearance of at least 18 in. (46cm) is required above the unit for cooling air flow.
2.2Heat Output
The unit produces minimal heat during normal operation.
Table 2 | Heat output | |
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| Heat Output |
Switch Size | BTU/Hr (kW) | |
| 250A | 12,590 (3.69) |
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| 400A | 20,140 (5.90) |
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| 600A | 30,200 (8.85) |
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| 800A | 40,270 (11.80) |
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2.3Operating Environment
The unit is designed to be installed indoors where the ambient air temperature is in the range of 32° to 104°F (0°C - 40°C) with a relative humidity of 0% to 95%
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