This part of IEC60794 is a detail specification. It gives detailed requirements for cables to be used in cords which are intended for use in a categoryC environment, according to IEC61753‑1 . They are characterized with temperature range between –1 0°C and +60°C. The fibre requirements for this specification are defined in IEC60793‑2‑10 for multimode fibres and IEC60793‑2‑50 for single-mode fibres. Some deviation to family specification IEC60794‑2‑50 requirements is allowed in certain clauses of this specification.