MECHANICAL
CASE: The HEMP Filters case shall be made of cold-rolled steel.
FINISH: All HEMP Filters cases shall be made corrosion-resistant with suitable lacquer over primer, All unfinished grounding surfaces shall be protected by suitable plating.
IMPREGNANT: The impregnant shall be non-flammable as classified by Underwriters Laboratories.
TERMINALS: The terminals shall be made of high temperature alumina ceramic. The ceramic terminal shall have a flexible insulated lead, one end of which is permanently affixed to the terminal, The other end shall be terminated in a permanently affixed lug which shall be mounted on approved flame-retardant insulator.