Unfortunately, water-damaged equipment cannot be properly restored to safe working order in the field. Siemens recommends replacing any water damaged equipment. Determining what is water damaged is difficult.
See Siemens Memorandum dated March 31, 2017. Also, see NEMA document, “Evaluating Water-Damaged Electrical Equipment” as a guide.
NEMA Evaluating Water-Damaged Electrical Equipment (2) (2).pdf
Water-Damaged Electrical Distribution and Control Products 2017 message (2) (1).pdf
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