I-20S and I-20A (1934 to 1937) Previous
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With the standardization of meters in 1934, the I-16 element was incorporated into the new meter housings, resulting in the I-20 series of meters, and it was made in 4 styles: I-20A, I-20B, I-20C and I-20S. The I-20A was the regular A-base meter. The I-20B had a special two-part terminal block that allowed easy testing of the meter in place. The I-20C was the I-20B with an enclosure for outside mounting. The I-20S was the socket version, and ones with S/N below 17,194,000 have the same full metal base as its competitors, ones beyond this S/N having the same large Bakelite insert as the I-30S. This unique base design allowed the I-20S to use the same meter element as the I-20A. The majority of the I-20 meters will have a small black nameplate similar to the I-16's but ones made in 1937 (and replacement units beyond this) have the same large silver plate as the I-30s.
 
I-20A
David Dahle collection
I-20C
David Dahle collection
I-20S
David Dahle collection