Something that is needed to be looked at is the de-rating calculation (NEC table) due to putting more than 4 energized wires in the same conduit. That means the wires will be allowed carry less amps then they were originally allowed to run probably requiring bigger wires for the same amp draw.
You must also look at the "fill %" of the conduit to make sure new wires does not exceed the maximum allowed by the NEC.
And finally if you have ever tried to use an existing conduit (overhead or underground) you will find it is almost impossible to pull in more wires unless the conduit is very big and you already have a spare wire or "pull cord" in the conduit.
You must also look at the "fill %" of the conduit to make sure new wires does not exceed the maximum allowed by the NEC.
And finally if you have ever tried to use an existing conduit (overhead or underground) you will find it is almost impossible to pull in more wires unless the conduit is very big and you already have a spare wire or "pull cord" in the conduit.
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