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Mineral insulating oils in electrical equipment. Supervision and maintenance guidance Ingestion-build-180956 BS EN 16523‑1 provides the1 Scope This International Standard gives guidance on the supervision and maintenance of the quality of the insulating oil in electrical equipment. This standard is applicable to mineral insulating oils, originally supplied conforming to IEC 60296, in transformers, switchgear and other electrical apparatus where oil sampling is reasonably practicable and where the normal operating conditions specified in the equipment specifications apply. This