extension cords and rain

In my construction activities I had cord connections submerged in dirty water, yet GFCI would not go off.
Dealing with marble/tile makes you always playing with wet electric cords and when I am careful to have GFCI protection, doesn't look it was ever needed.
Meaning the danger is minimal, but I think wrapping the connection in plastic and putting it elevated (brick or piece of 2x6) is good precaution.

Interesting box ideas!

I always seem to be able to tuck the connection under my rig to stay dry.

I also always tie cords in a knot before connecting (wet or dry) so that if someone trips over a cord or yanks on it, it won't come halfway unplugged and arc.

Ir's good to wrap the cord around the post before plugging in, for the same reason.

Ace sells a cord cover for connections. It looks like a giant pill, but they work great.

I used to wrap up in plastic bags
But I followed another members lead
And bought a plastic ammo box with gasket in the lid
Cut 'U' notches in opposing corners , it's water proof, the connection stays dry, had a nice good latch, won't pop open If somebody trips over it

For my peace of mind, I wrap the plugs with a plastic bag and tape it good then place it on a block of wood or a rock. Never had a problem. Good luck

Thanks all! That answers all of my questions!

I found that my TT plug and the end of the extension cord had signs of arcing (burn marks) after I had to use the extension cord when stopped for an overnight without unhooking. It rained on me driving into site, while setting up and all night as well as the next morning unhooking. the connection did appear to be quite wet that morning as I disconnected.

Since that time I bought a SockitBox from Amazon. I have also seen people that make something similar out of plastic storage boxes of some type. For me, it was worth the cost, to have it already made. I use it for months at a time set up at the house. When I have checked it, everything inside has been COMPLETELY DRY. Sure makes me feel better.

Most cords (outside type) are made to be connected with no problem, inside or out. Some folks make some simple covers that shed rain. I have on occasion just placed a small plastic bucket on top of the connection point. But, when laying on the grass, I always put a wooden block (since I always carry lots of lumber), under the connection point to get it off the ground. In the event of rain, rain water will drain around the plug (which is higher than the ground water potential), and also easier to spot if anyone is cutting through the campsite. It's simple to do, just put something under the spot where the 2 cords connect to raise the connection a little. Never had problem doing this, rain or dry. If I know heavy rain is expected (especially at home), I'll cover the connection with a Schwan's 1 gallon ice-cream tub bucket. They work great for all kinds of things like this and we have a lot of those buckets.

Generally 20A plugs are GFCI protected and hence subject to tripping with rain. You could use a plastic box and seal the cord openings.

I have used my 25-foot extension cord (30 amp service) in the rain many times over the years without a problem. Pure water is a poor conductor of electricity, and rain water is almost pure.

But when it is wet outside, just to be on the safe side, I don't handle the extension connection while it is hot. I turn the breaker switch off, then connect the extension cord, then turn the breaker switch on. Unplugging in the wet, I turn switch breaker off, then disconnect the extension cord.