BS 148:2020,Recycled mineral insulating oil for transformers and switchgear – Specification.BS 148:2020 pdf free download.
BS 148:2020 specifies requirements for recycled oxidation inhibited and uninhibited mineral insulating oils, as delivered, for use in transformers, switchgear and similar electrical equipment in which oil is required as an insulant and/or for heat transfer. Oils with and without additives are within the scope of this standard.
This standard does not differentiate between methods used to recycle used mineral insulating oil, thus reclaimed or regenerated oil, re-refined oil, dechlorinated oil and reconditioned oil are all considered recycled oil for the purposes of this standard.
This standard does not apply to mineral insulating oils used as impregnates in cables or capacitors, or to hydrocarbon insulating liquids obtained by synthesis.
2 Normative references
ASTM E1687-10, Standard test method or determining carcinogenic potentia of virgin base oils in metalworking fluids.
BS EN 60156, Insulating liquids- Determination of the breakdown voltage at power frequency.Test method

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