This British Standard specifies requirements for reclaimed 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 or for heat transfer.
Oils with and without additives are within the scope of this standard.
This standard does not differentiate between the methods used to
reclaim used mineral insulating oil; thus it is also applicable to oils
having undergone a re‑refining process.
This standard does not apply to mineral insulating oils used as
impregnates in cables or capacitors, or to hydrocarbon insulating
liquids obtained by synthesis.
BS 148:2009 history
2020BS 148:2020 Recycled mineral insulating oil for transformers and switchgear. Specification
2009BS 148:2009 Reclaimed mineral insulating oil for transformers and switchgear – Specification
1998BS 148:1998 Specification for unused and reclaimed mineral insulating oils for transformers and switchgear