OC (1932 to 1941) Previous
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In 1932, the OB meter was redesigned and released as the Type OC. The case is deeper than the OB, the cover now attaches to the base with a pair of bayonet studs, and an unique interlock allowed the OC to be secured with only one seal. The OC also incorporated all the improvements that Westinghouse phased in during the OB's production span which allowed better operation over a wider range of temperatures and loads. The very first OC meters started out with a 8-digit S/N in the 12 million range, then was quickly changed over to an alphanumeric serial number (1 to 5 digits with a letter at the end). This serial number scheme must have been a difficult one for the utilities to understand as numbering reverted to an 8-digit number in 1937. Some of the very last OCs made do have the same copper-plated brake magnets (the silver ones) as used on the CS and CA. Unlike the Type C, OA, and OB meters, the OC came in only 2 major styles: the normal bottom-connected version and a 'detachable' (socket) version. Although the CS and CA were introduced in 1934, the OC was manufactured in smaller quantities until it was dropped in 1941. OC
David Dahle collection