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We spoke with our Intermatic sales rep. and he stated that the 1103 model is designed to accomodate 4 wires - 1 Neutral, 2 Hots & 1 Ground and the 1102 is designed to accomodate 3 wires - 2 Hots & 1 Ground. Intermatic stated that you should be able to look at the wires going to your pump or the wires going to your breakers to determin if you have 3 or 4 wires. Thanks!
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