This British Standard states the requirements for ‘Nyvin’ type cables for aircraft wiring. The cables are suitable for use in circuits  in which the voltage between conductors, between a conductor and a metal braid, surrounding it and between a conductor and the aircraft structure nowhere exceeds 600volts r.m.s. and in which the frequency does not exceed1600c/s

The  cables are suitable for use where, in continuous service, no combination of ambient temperature and conductor current Produces a stabilized conductor temperature in excess of 105^oC. They are suitable for fixed wiring in aircraft at temperature Down to -75^oC,but are not suitable for severe flexing at temperature below –30^oC.

The cables do not support combustion but they do not comply with the requirements of British    Standard G. 100 in respect of fire resistance.

The cables are suitable for use in areas where ester-base fluids are present.

The generic name ‘Nyvin’ is applicable only to cables covered by this British Standard and complying with all its requirements.

The standard includes the following ranges if cables:

(i)  Nyvin. Cable  with  a Annealed Tinned  copper  conductor  and  an  Insulation  of  HR PVC  compound ,  glass  braid  with  an  outer   protective covering of extruded nylon for sizes ranging from 22 to 12.
Nyvin. Cable with a Annealed Tinned Copper conductor and an insulation of HR PVC Compound , Glass Braid, Nylon Braid and protective nylon lacquering for sizes ranging from 10 to 0000.

(ii)  Nyvinal.  Similar  to  the  Nyvin  range  but  with  a  conductor  of  aluminum  instead  of  copper.

(iii) Nyvinmet.  Similar  to  the  Nyvin  range  but  with  the  addition  of  a  metal  braid.

(iv)  Nyvinmetsheath. Similar to the Nyvin range but with the addition of a metal braid and a sheath comprising a polyester film  tape. a nylon fiber or ribbon braid, nylon lacquered, to prevent abrasion in installations where Nyvinmet cable is in contact with cables without a metal braid.

The cables are classified and identified by a series of numbers indicative of the  conductor  cross-sectional area.  The number correspond to those used  for  equivalent  American cables.