a. This British Standard states the requirements for 'Minyvin' 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 300 volts r.m.s., and in which the frequency does not exceed 1600 c/s. The cables will withstand a transient voltage of up to 1500 volts.
The cables are suitable for use where, in continuous service, no combination of ambient temperature and con-ductor current produces a stabilized conductor temperature in excess of 105°C. They are suitable for fixed wiring in
* To be pronounced 'mǐ'ny??n.
+ G.177. 'Nyvin type electrical cables for aircraft'.
aircraft at temperatures down to —75°C, but are not suitable for severe flexing at temperatures below — 30°C.
The cables do not support combustion but they do not comply with the requirements of British Standard 2G 100 in respect of fire resistance.
The cables are suitable for use in areas where ester-base fluids are present.
A test and limit for the pliability of the cables is included in this standard (see Clause 21).
b. The generic name 'Minyvin' is applicable only to
cables covered by this British Standard and complying with
all its requirements.
c. The standard includes the following ranges of cables:
(i) Minyvin. Cable with a tinned copper conductor and an insulation of PVC compound and glass braid, with an outer protective covering of nylon.
(ii) Minyvinmetsheath. Similar to the Minyvin range but with the addition of a metal strip braid and an overall nylon sheath.
(iii) Duminyvin and Triminyvin. Two- or three-core cables consisting of two or three Minyvin cables twisted together.
d. The cables are classified and identified by a series of
numbers indicative of the conductor cross-sectional area.
The numbers correspond to those used for equivalent
American cables.
e. The maximum current ratings for Minyvin cables are
quoted in Appendix A.