Wet Vs. Damp
Wire Sizing
100

A spot thats a little moist but not drenched

What is a damp location?

100

Thin wire used on 15 amp circuits

What is 14 AWG?

200

An area fully exposed to rain or standing water

What is a wet location

200

Standard copper wire for 20 amp circuits

What is 12 AWG?

300

Under a covered porch that gets occasional condensation

What is a damp location?

300

Bigger than 12 AWG for 30 amp

What is 10 AWG

400

A vault or manhole below ground level

What is a wet location?

400

How we know how much current a wire can safely carry

What is ampacity?

500

The NEC article listing both "wet location" and "damp location" definitions 

What is Article 100?

500

Table where you look up those ampacity numbers

What is 310.15(B)(16)