According to this voltage drop table it looks like for 100 run you would want to up size the wire to 8 copper to maintain voltage drop less than 3.
30 amp wire for dryer.
The minimum recommended wire size for clothes dryer circuits is 10 gauge.
Typically a 220v 30 amp dryer circuit would utilize 10 3 with ground.
Obviously this requires a 30a breaker.
To install a flush mount outlet the electrical circuit wiring must be a type nm cable or an approved conduit which will need to be installed inside the wall.
The usual wire in a dryer circuit is 10awg.
So you have arrived at the correct conclusion within your question to use 8 3 with ground.
If the dryer draws 40 amps you need to upgrade the wire to a beefier eight gauge.
However amperage decreases over distance so appliance manufacturers advise a larger wire gauge for circuits that extend beyond a distance from their source.
What happens if you use too small gauge wire.
If your dryer draws 30 amps like most dryers the dryer wire gauge is 10 gauge.
This circuit originates from the breaker box containing a 2 pole 30 amp breaker.
Panel circuit for a 30 amp 240 volt electric clothes dryer jose save your money you may not need to install a new sub panel.
This requires a 30a breaker.
This size breaker requires a minimum of a 10 gauge wire so this wire used would be a 10 2 with ground.
The de facto standard dryer receptacle is 30 amps.
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If you have a 30 amp breaker right for your air conditioner water heater or clothes dryer that needs to be wired but you are clueless about what size of the wire gauge is needed allow us to help you out with not just that but also in understanding the basics involving wire gauges.
Wire gauge for clothes dryers clothes dryers require a relatively thick wire to accommodate their 30 amp circuit.
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Because a dryer runs on 240 volt power you need three conductor cable to connect it to the panel.
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In most cases and with newer electrical service panels there are quad circuit breaker that can be used to create two 2 pole 240 volt circuits in the same place as one 2 pole 240 volt circuits.
3 prong dryer outlet the 3 prong wiring diagram above shows the proper connections for both ends of the circuit.
A 4wire 30 amp 250 volt flush mount dryer receptacle outlet should be compatible with your 4wire dryer cord configuration which includes the required ground wire.