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<br />City of Arden Hills, MN – 25X.137753 LIFT STATION CONTROL SYSTEM <br />January 2026 PAGE 26 90 04-18 <br />©2026 Design Tree Engineering, Inc All Rights Reserved <br />L. Power supplies shall be sized appropriately to handle the full load connected to them. <br />1. Provide an additional 50% spare capacity. <br />2. Power calculations showing the required load with additional spare capacity shall be provided <br />during the submittal phase. <br /> ENCLOSURE FORCED AIR HEAT <br />A. Manufactured unit with aluminum housing and integral thermostat and 0 to 100ºF adjustable range. <br />B. UL labeled. <br />C. Provide quantity and size as required to meet temperature requirements specified (min. of 45ºF). <br />D. Manufacturer/Model: <br />1. Hoffman DAH Series or equal. <br />2. Or Equal. <br /> CONTROL RELAYS <br />A. Blade plug-in type with dust cover and socket. <br />B. Coil: continuous operation at 120VAC ±10% unless required to be otherwise per the circuit it is used in. <br />C. Contacts, 3 pole, double throw, minimum. <br />1. 10 amps, make-break, 120 VAC. Resistive. <br />2. Insulation resistance: 1000 megohms at 500 VDC. <br />3. Dielectric: 2000 VAC, 60 Hz. <br />D. Operating time: <br />1. 35 milliseconds (nominal) energization. <br />2. 100 milliseconds (nominal) De-energization. <br />E. Mechanical life: 10^6 operations. <br />F. Temperature: 0° to 70°C <br />G. Manufacturer/Model: <br />1. Allen-Bradley <br />2. Idec <br />3. Pre-approved equal. <br /> POWER RELAYS <br />A. Coil rating to work with control system power. <br />B. Contact rating which matches or exceeds the circuit’s overcurrent protective device. <br />C. Approved Manufacturer: <br />1. Allen-Bradley <br />2. Square D <br />3. Pre-approved equal. <br /> SELECTOR SWITCHES <br />A. Heavy duty, 30.5 mm, oil tight units.