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The actual value of the insulation resistance at a given time is less important than the trend over time.

Infrared thermography is used to identify the presence and amount of harmonic currents that cause overheating and damage to transformers.

The general rule for transformers rated 600 V, nominal, or less is to protect the primary windings of the transformer at not more than 200% of the rated primary current of the transformer.

During an insulation resistance spot test, the test voltage is applied for _____.

A rupture disc can be used as a pressure relief device and typically consists of a thin layer of rubber mounted in a disc holder.

All transformers generate heat.

An insulation resistance test is a test performed to measure the ___ through the coil insulation.

A ___ installation is an electrical installation in which the conditions of maintenance are such that only qualified persons monitor or service the electrical equipment.

The primary mechanisms for the breakdown of insulating fluids are heat and contamination.

A transformer rated for operation at 25 Hz can be directly replaced with one rated at 60 Hz.