brendastarr wrote:Thanks, Archangle. Your post convinced me to never use the cord again--always use a battery, so thanks for that! Thanks for the gauge and length info too. I had a feeling I was fine, but this man had me a-tremblin'. He said I had to check and see if the cord got hot, which I did not since that night I was in the midst of an electric storm. I just knew it had worked the night before. What a pain it is to camp with a battery when it only has 8 hours of working time and you constantly have to worry about where you will plug it in.
The cord getting hot is not going to be a problem unless you've got a really heavy load on it like an air conditioner. A long cord or a small gauge cord with a heavy load is going to cause a voltage drop which might cause problems with operating some devices, but once again, your CPAP isn't going to draw enough power to cause a problem there.
Are you worried about electrical shock from the CPAP itself? If so, I wouldn't worry about that too much if it isn't wet. Even then, the CPAP machine is probably not going to shock you unless the machine itself is really wet. As long as it's dry in the tent, and on the part of the power cord inside the tent, it shouldn't be too much of a shock risk, as long as that is dry. Don't mess with any wet plugs or connectors outside the tent if they are wet.
The GFCI is to help reduce the risk of being shocked by the electrical cord itself. Put the GFCI where you plug into the power, and it makes everything plugged into the GFCI less dangerous in terms of shock