American Power Conversion SYMINIF, SYMSTRF-PD SymmetraTM Wiring, Input Wiring, Output Wiring

Chapter 4 - Electrical Requirements and Procedures

SymmetraTM Wiring

νAll power and control wiring must be installed by a licensed electrician only. All input, output and emer- gency power off wiring must comply with the National Electric Code (NEC) and applicable local codes.

νIt is highly recommended that flexible metal conduit be used when hardwiring the Power Array. This will provide for ease of service and maintenance of the sys- tem.

There are four categories of hardwiring installation proce- dures for the SymmetraTM Power Array. These are; input wiring, output wiring, remote emergency power off switch wiring, and installing an optional local grounding electrode.

Input Wiring

The Power Array requires a single phase 208V or 240V in- coming AC utility power source. Incoming power is wired directly to a terminal block inside the Power Array. Specifi- cations and installation procedures are provided.

Output Wiring

Power is distributed to the load equipment via hardwired connections to an output terminal block inside the frame, and by plugging the load equipment into an optional power distribution panel. The Power Array delivers 120V/208V/ 240V power to the output terminal block. Configurations for hardwiring 120/240V and 120/208/240V output voltages are provied in this chapter. Specifications and installation procedures are provided.

REPO Switch Wiring

The SymmetraTM Power Array can be connected to either a dry contact, or a 24Vdc remote emergency power off (REPO) switch. The wiring terminal connections for the REPO are physically isolated from the primary circuitry of the Power Array. Specifications and installation procedures for REPO wiring are provided.

Local Grounding Electrode

A 1/2”knockout is provided on the output wiring access panel for those sites where NEC code 250-26 requires a local grounding electrode. This grounding electrode is installed in addition to the equipment safety ground that is run with the input hardwiring connection. The local grounding electrode is connected from the output terminal block to the nearest effective ground, such as building steel, a metal water pipe, or other appropriate grounding structure. The procedure for installing a local grounding electrode is included in the output wiring procedures.

Note: The local grounding electrode must meet National Elec- tric Code standards, as per NEC Table 310-16.

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