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Before scheduling I&C testing (e.g., loop testing) of a control system, a thorough test of field wiring should be performed by the installing electrician. This test should include complete wire insulation testing (“meggering”) and continuity testing. It should also comprise testing for the presence of grounds, shorts, and correct terminations at the designated devices and panels in accordance with approved interconnecting wiring diagrams.

Testing for fiber cables should also be performed using an optical loss test set (OLTS). The OLTS consists of a light source and an optical power meter. The main function of this equipment is to measure the optical power or loss. Testing should be conducted according to Telecommunications Industry Association (TIA) guidelines (TIA TSB-140; http://www.instrument.org). This document provides guidelines for the field-testing length loss, and polarity of a completed fiber optic link.