A complete installation consists of mounting the power module in a suitable location and making connections to a source of AC service and to the lighting fixtures. Typical installation configurations are shown in the figures provided.

The power input automatically uses conventional AC line-supported high voltage from 208 to 277 VAC and must be treated safely to avoid dangerous shocks. The lighting or load-side of the power unit delivers a safer low voltage DC (26.6 volts for the NPS 660 and 53.3 volts for the NPS 1000).

To avoid excessive power robbing and voltage drops on the load side when using standard size wiring power modules must be close to the lighting fixtures. There are three ways to insure that the low voltage connections provide low resistance paths from the power module to the fixtures:

1. Fixture Clustering:
   To insure low resistive path to the fixtures, a "cluster" of fixtures should be identified for connection to the power unit. Clusters are sets of fixtures that by building design reside in the same general area. A conference room with perhaps 4 to 8 fixtures may be considered a cluster because they reside in the same area confined by the room dimension and switch location. A string of offices consisting of two fixtures each may also constitute a cluster. Within a cluster, lighting fixtures tend to be in close proximity to each other. Typical spacing of such adjacent fixtures vary from 2 to 6 feet and are frequent connected to the power source or wall switch with a single cable run. Several clusters may be connected to the power module through an electrical junction box, but care should be taken not to exceed the maximum power capacity of the power unit to avoid going into automatic current limiting.
   
   
2. Central Mounting:
   It is recommended that the power module be mounted centrally among the cluster of fixtures it will support. This will not prove difficult since the power unit is small enough to be treated like a standard electrical device box and can be conveniently mounted almost anywhere there is a vertical mounting surface.
   
   
3. Wire Sizing:
   Standard AWG wire sizes may be used (AWG 14, 12, 10), however, the cable lengths connected to the battery storage unit must be at least AWG #10. This size and larger allows greater freedom in the location of the battery container within a variety of existing building spaces not to exceed 30 feet for AWG #10. The unused ground wire on a three-conductor cable may be used in parallel with one of the primary conductors to further reduce resistive losses.

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