Onsite Staff do not know electrical codes or common electrical terms
HPS greatly appreciates your use of our magnetics in your applications. Our products are meant to be installed by qualified electricians familiar with the local electric codes and the overall system requirements. HPS is the leader in the design and manufacturing of transformers and other magnetics. We are not experts on electrical codes which can vary across the US. Our units are fully compatible with the common installation requirements of the NEC and other local codes. Due to the complexity of electrical systems, there are many questions and problems which require a broad systems solution and local knowledge of the system that we can not offer. Installation by unqualified people can cause equipment failures and dangerous situations.
Transformer insulation is generally rated for 220°C but may be lower for some designs including control or encapsulated. Standards permit the temperature of the transformer enclosure cover to be 65°C over ambient. When temperatures exceed the rating for the insulation system or enclosure, overheating occurs.
Burned, darkened or damaged insulation may be apparent along with a burnt smell. The hottest part of a transformer is the coil near the top of the core. Energized transformers should not be touched. If the insulation is damaged or smoke is visible, the unit may need to be returned for testing and replaced or repaired.