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How much derating will occur if I run 3 2awg and 1 4awg in a 1.5" EMT conduit? Breaker is likely to be a 75Amp. 2 conductors will be hot legs.
 

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How much derating will occur if I run 3 2awg and 1 4awg in a 1.5" EMT conduit? Breaker is likely to be a 75Amp. 2 conductors will be hot legs.
You only derate for current carrying conductors, not conduit size. If this circuit is fed from a single phase 120/240 V source, then you only have two current carrying conductors, so no derating is required. Over three conductors is when you begin to derate.
 
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