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The most common tests are functional tests and demonstrations for the owner and staff. Manufacturer f ield t ests: More commonly specified than factory witness tests are requirements for the electrical equipment manufacturer to require factory-trained technicians to perform additional testing and adjustments in the field during or after installation. Often, larger and/or complex electrical equipment is shipped in parts, and having a factory-authorized technician onsite to test equipment after the contractor has installed it can be helpful. However, consulting engineers may wish to specify additional “factory witness testing.” This additional witness testing permits the consulting engineer to perform preinstallation inspection of the equipment and request simulated functional testing performed by the manufacturer. Often, witness testing is only required for large or complicated electrical equipment and for mission critical projects. Witness inspections can include confirmation of equipment dimensions and weights, proper nameplates and labels, locations and sizes of conduit openings, communication wiring points, and cable lug configurations. Functional witness testing may include simulated sequences of operations, such as start-ups and load transfers, fault conditions, load loss, and alarms and display information.Ĭommon challenges for the busy engineer and budget-constrained owner is the time and cost for the travel to the factory-and deciding who from the team should attend. Depending on the awarded manufacturer, the factory may even be located outside of the country where the engineer or project resides. In these cases, the option of “virtual factory witness testing” is a possibility using video conferencing. This allows engineers, owners, and contractors to participate remotely in witness testing and preinstallation inspections.
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