AC and DC requirements for the UMTS cabinet
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AC convenience outlet

Cell sites must be equipped with at least one duplex convenience outlet, which is needed for installation and maintenance procedures. The outlet is required to power test equipment and installation tools. The duplex outlet must be protected in accordance with national and local electrical codes. An outlet must be installed within 1.5 meters (5 ft.) of the Macrocell cabinets. Ground Fault Circuit Interrupter (GFCI) types are recommended and must be used where required by code.

AC line surge protection

Important!  The UMTS Macrocell cabinet is not equipped with AC-line surge protection. AC-line surge protection is required at the site's main AC panel.

A surge protection device capable of discharging the surge waveforms as defined in IEEE C62.41 (1991), Recommended Practice on Surge Voltage in Low-Voltage AC Power Circuits, for Location Category “C3” and “High System Exposure” must be installed in the AC panel board or load center supplying AC power to the power cabinet. The AC panel board or load center, surge protector, and AC wires from the service panel to the power cabinet are not supplied with the power cabinet. They must be ordered and installed as part of site preparation.

3GP24i cabinet

The 3GP24i power cabinet is equipped with two rectifier shelves (the second shelf is optional). Each shelf can support up to four KS24637 rectifiers. The power cabinet is equipped with a terminal block located inside of the cabinet for connecting three single phase AC power circuits to power up to eight rectifiers in the cabinet. Each AC power circuit requires one phase of 240 VRMS or 208 VRMS (Line 1 and Line 2) protected by a 2 pole, 70 A breaker. A common ground wire also run together with the three power circuits. To balance loads in a three-phase, 208 VRMS service, each AC power circuit should be connected to a different phase, the power cabinet accepts a 1 1/2-inch conduit for the AC power supplies, and is located at the top of the cabinet. This conduit must be provided as part of site preparation.

AC input requirements for 3GP24i power frame

The 3GP24i requires three single-phase branch circuits, supplied from an external load center or AC service panel. The panel shall be installed during site preparation. Each branch circuit shall be protected with a 70-A circuit breaker. Each pair of wires that come from the panel shall be 25 mm² (4-AWG) copper THHN wire. All the circuits shall run in the same conduit from the panel to the appropriate location of the power system. In addition, a common 16 mm² (6-AWG) copper THHN ground wire (equipment grounding conductor) shall run in the same conduit.

The following table provides the AC input current for four KS24637 rectifiers (3 kW each) and an optional fully-configured 3GP24i power frame -- equipped with eight KS24637 rectifiers, which are powered by 208 VRMS or 240 VRMS.

Power requirements and battery reserve times for UMTS Macrocell Indoor cabinets

For power requirements and battery reserve times for UMTS Macrocell Indoor cabinets refer to Appendix F, Power requirements and battery reserve times for UMTS Macrocell Indoor cabinets.

DC power requirements for non integrated power

If an external power system +24/–48 VDC will be used, refer to Appendix C, Electrical power requirements for customer supplied power +24/-48 VDC systems for DC power requirements.

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