Metals: fron and steel are generally to be painted or galvanised asappropriate. Indoor parts may alternatively have chromium or copper-nickelplating or other approved protective finish. Small iron and steel parts (otherthan stainless steel) of all instruments and electrical equipment, the cores ofelectromagnets and the metal parts of relays and mechanisms shall betreated in an approved manner to prevent rusting.Screws, Nuts, Springs, Etc.: The use of iron and steel shall be avoided ininstruments and electrical relays wherever possible. Steel screws shall bezinc, cadmium or chromium plated, or when plating is not possible owing totolerance limitations, shall be of corrosion-resisting steel. Instrument screws(except those forming part of a magnetic circuit) shall be of brass or bronze.Springs shall be of non-rusting
Metals: fron and steel are generally to be painted or galvanised asappropriate. Indoor parts may alternatively have chromium or copper-nickelplating or other approved protective finish. Small iron and steel parts (otherthan stainless steel) of all instruments and electrical equipment, the cores ofelectromagnets and the metal parts of relays and mechanisms shall betreated in an approved manner to prevent rusting.Screws, Nuts, Springs, Etc.: The use of iron and steel shall be avoided ininstruments and electrical relays wherever possible. Steel screws shall bezinc, cadmium or chromium plated, or when plating is not possible owing totolerance limitations, shall be of corrosion-resisting steel. Instrument screws(except those forming part of a magnetic circuit) shall be of brass or bronze.Springs shall be of non-rusting<br>
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