Outdoor Electrical Wiring

The only way a wire would overheat is from carrying too much current.

yes.

The only way a GFCI would trip is when something leaks electricity from hot to ground. That, as such, is dangerous and should be prevented, especially in fountains and wet areas.

I have no useful thoughts on using conduit, but definitely protect it with GFCI. No doubt here.

According to Big Daddy :

You're going to have to ask your local inspection/permitting office. Burial requirements vary quite a bit from place to place. Here, with NMW (aka UF), you must bury it 24" or more. With "protection" (a board or PVC pipe, but that doesn't work in the US), we can get it to 18". Shallower than that, it needs steel conduict.

Motors will _not_ be an issue with a GFCI. Especially a small one like you're likely to be using. The only time where you avoid GFCIs is things like fridges or freezers because of the consequences of a failure - and the NEC specifically permits you to _not_ use GFCIs for that.

If the wires are protected by a GFCI back at the house, you should be able to use direct burial only 12" deep. (Table 300-5, column 4, "Residential Branch Circuits Rated 120V or Less with GFCI Protection and Maximum Overcurrent Protection of 20 Amperes")

If the wires are not GFCI protected (like if you had a GFCI outlet at the fountain but no GFCI protection at the house) you would have to bury the cable 24" deep.

Best regards, Bob

You can direct bury, but conduit is cheap enough to get some extra protection.

This is why the high tension power lines are run for miles overhead instead of under ground. If the fountain pump going to pull maximum load of about

Yes, but only one per circuit. If the present setup has GFCI you are OK. You do not want them in series.

Again, in the right circumstances it may. My fountain has been running four summer with no problem.

A related question: Is there a cover available to shield the recepticle when it has a plug in it? I found that rain often tripped the GFCI.

According to Alan :

Yup. The NEC makes them mandatory for outdoor outlets now.

Outdoor outlets need outdoor receptacle covers. The old type has individual hatches that seal up the openings like submarine hatches. There is a newer type which is a clear plastic projection over the outlet. It has room for and completely covers the plug, further protecting the outlet and the plug cord from the elements.

Your junction box should probably be plastic which will be safer and minimize corrosion problems. Be sure to wire the ground wire to your outlets.

Beachcomber