Specifications

Section 3: Installation Planning
3-9
3.4 GENERAL WIRING REQUIREMENTS
The following cable and wiring requirements will satisfy normal safety standards. Refer to local
standards for additional information.
 In general, no power wires should be thinner than 18 gauge.
 Ends of wires clamped under binding screws or similar parts must be tinned and terminated
using a crimp tool.
 Wire splices must be insulated to withstand the same voltage and other conditions that the
individual wires are required to withstand.
 Flexible power lines of any type must be protected with bushings when they pass through
walls and sheet metal.
 All S-Net devices are connected with twisted pair wire plus shield.
Grounding of the Alto 818 system, its power supplies, and all node devices is essential to
guarantee proper system operation. The system must be single-point grounded." All signal
grounds and all chassis grounds are connected to the ground terminal of the ACU power supply.
This, in turn, is connected to earth ground via the AC circuit. Unplugging the power supply from
the AC wall outlet should float the entire system; with the power supply unplugged there should
be no continuity between earth or building metal ground and any conductive part on the ACU or
any of its system devices.
In general, the S-Net shield should be grounded at one end only. If noise problems or other
symptoms such as incorrect reads or false error messages occur when the system is first
powered on after installation, contact WSE Customer Service for assistance.