American Power Conversion PX user manual Input Wiring Specifications, Input Wiring Procedures

Chapter 4 - Electrical Requirements and Procedures

Input Wiring

nRead this chapter completely before installing wiring.

nVerify that all incoming line voltage (mains power) and low voltage (control) circuits are de-energized and locked out before installing cables or making connec- tions, whether in the junction box or to the SymmetraTM Power Array.

nAlways verify that all battery modules are removed and all battery extension frames are disconnected from the Power Array before installing wiring.

Input Wiring Specifications

The Power Array requires a single phase 220V, 230V, or 240V

50or 60Hz incoming utility (mains) power source. A 3-con- ductor cable (2 live, 1 ground) is to be brought to two input wiring terminal blocks inside an adequate length of flexible metal conduit. To minimize disturbances caused by other loads in the building, input wiring should be supplied di- rectly from the service entrance (a dedicated power feeder).

All electrical service, both input and output, must be sized in accordance with local building codes. The circuit for input power must be adequate to carry the full load of the system and the load equipment. The 3-conductor input cable should be sized for no more than 3% voltage drop.

A 20 mm (3/4") knockout in the input wiring access panel provides access to the terminal blocks.

See table 4-1 for input wiring specifications.

Input Wiring Procedures

1.Refer to figure 4-1. Locate the input wiring entry and input wiring inspection panels at the rear of the frame.

2.Remove the four screws securing the panels to the frame. Remove only the screws indicated in the illustration. Place the screws and panels aside.

Entry Panel

Fig 4-1 Removal of Input Hardwiring Panels

3.Pull the input wires through an adequate length of 20 mm (3/4") flexible metal conduit, leaving about 51.3 cm (20") of wiring extending from the end. Install a flexible metal con- duit connector to the end of the conduit. Using appropriate tools, remove the knockout in the entry panel. Feed the wires through the entry panel, and attach the flexible metal con- duit connector to the panel.

4.Strip 13mm (1/2") of insulation from the end of each of the incoming wires.

5.Note the positions of the ground wiring terminal block and the input wiring terminal block. See figure 4-2.

Input	Frame	Input Full	Input
Voltage	Size		Overcurrent	Minimum Input &
		Load
(2-wire plus	(Max. kVA		Protection	Ground Wire Gauge
		Amperage
ground)	Rating)		(External)
220Vac, 230Vac	Mini (8kVA)	35 Amp	50 Amp	#8 Gauge (3,264 mm)
or 240Vac	Master (16kVA)	70 Amp	100 Amp	#4 Gauge (5,189 mm)

Table 4-1 Input Wiring Specifications

4-2