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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.

When a third unit is added to an open delta transformer configuration to close the delta, each transformer can only deliver 75% of its rated capacity.

Variable control transformers can be used with buck-boost transformers to create a(n) ___ regulation system.

Control transformers for HVAC systems are usually rated 120 V or 240 V on the primary and ___ V on the secondary.

Ground connections should be inspected regularly for ___ connections.

A(n) ___ test is performed to measure the electrical resistance of insulation between two conductors or between a conductor and ground.

A(n) ___ is a device used to shunt a voltage spike to ground or from line to line.

Guarding can be accomplished by ___.

___ transformers contain no oil and are cooled by circulating air.