I-60S (1957 to 1972) Previous
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The I-60S was the final evolution of the I-50's design. This meter had a full-load rating of 30 amps and using the 667% overload compensation introduced with the I-55 meant this meter could safely handle up to 200 amps, superseding the 50-amp I-50S meter (which used 400% overload compensation). This was accomplished by mounting the voltage and current coil assemblies separately to the frame and which allowed the current coils to move in relation to the frame without affecting the calibration. The earliest I-60S meters had the same solid front as the I-50 and I-55 meters, but with S/N #42,400,000, a post was added to the frame for the nameplate to allow separate mounting of the nameplate and register. Also, I-60 meters up into the 43 million series had butyl rubber sleeving on the current coils, while later I-60 meters have epoxy-coated current coils. I-60
Schenectady Museum Archives