I'm about to pull my hair out......Gfci on hot tub trips as soon as breaker in main panel is turned on....replaced breaker with new 50 amp gfi....replaced wires from gfi box to tub....unhooked all plugs on control box........it even trips if you unhook the main hot wires to the tub....with only the nutral hooked up to the tub.....
if you unhook the white gfi nutral the tub runs fine......this makes no sense to me what so ever......PLEASE HELP!!!!!

KeepItSimpleStupid

Is this a new or existing installation?

Have you wired LOAD NEUTRAL only to the hot tub and the pigtail only to the Hot tub Panel?

Are you sharing a neutral with something else?

runnerman383

Yes...it trips with only the nutral hooked up and no power at all out at the tub.......No I am not sharing a nutral....It is on it's own curcuit

runnerman383

it is a new installation but a used tub

KeepItSimpleStupid

On the GFI breaker, there are 3 terminals + a pigtail. Correct?

The pigtailed wire must go to the breaker box. Nothing else.

Load Neutral, which should be a terminal on the GFCI breaker, goes to all the hot tub circuits.

Here is a SPA disconnect. Note that Load neutral and panel neutral positions.

Wiring a Hot Tub - Electrical Installation and Wiring Diagrams

This may help too:
http://ts.nist.gov/Standards/Global/upload/gannon.ppt

runnerman383

correct.....and everything is hooked up as you say and correctly...tub nutral to center termenal on gfi....marked load nutral....white pigtail on gfi to nutral bus in box

KeepItSimpleStupid

This is getting difficult.

In your panel, you have run 4 wires to the SPA panel, correct?
Black, red, white and gnd.

GFI's will protect against, reverse polarity (e.g. a neutral and a hot switched)
A shared neutral.
A Hot1-Hot2+N > ~6mA.

With the load wires removed from the GFCI, it should not be able to trip and you claim it does.

With that information at hand, I'll have to ask the following:

Is it possible that a hot and neutral are mixed up?

Does the wiring from the SPA panel go to a main panel or does it go to a sub-panel before the SPA panel?

I'm almost getting ready to suggest posting a picture using "go advanced" of the SPA panel connections and the main panel connections.

runnerman383

sorry, but if it wasn't difficult I wouldn't be askin!!!!!!

actually it is 3 wire .....wires are color coded and in the proper places, and although I can't figure how either, it does trip with only the nutral to tub hooked up!!!!!

Wires run from spa control panel to siemens 240 V gfci panel then to a 50 amp breaker in the breaker/disconect panel for the house.....

Sorry I dont have a digital camera to take pictures with

KeepItSimpleStupid

3 wires mean: Hot 1, Hot 2 and ground.

But guess what, the GFCI breaker needs the pigtail neutral to function. Load neutral is optional.

So, you need to get 4 wires out to the GFCI panel OR put a GFCI breaker in the main panel. Then have a 3 wire feed to tub.

Those are the only two solutions that I know of. In both cases the GFCI MUST have it's LINE neutral CONNECTED, but it's LOAD neutral can be left unconnected.

It's OK to not use LOAD neutral, but LINE neutral MUST be connected.

runnerman383

so if I install an earth ground to the gfi panel are you saying it should work properly???

Or a ground wire from the main breaker box for the house???.....As I'm sure you know the ground and neutral are bonded in the house disconect box....so I don't really understand how running another wire from there would sooth the gfi's mind any at all......