Balboa BP501 Wiring

[Ajl500]

I inherited a cedar spa from the previous owners of my home. The spa pack is a Balboa BP501 running off a 240v GFCI circuit. I took a look at it and noticed that there are only 3 wires supplying the pack, 2 hots and a neutral, but nothing is attached to the ground tab. I had a general electrician (not a spa/pool specialist) look at this and he said there was no issue since all the supply piping is PVC and any malfunction would just trip the GFCI.

I remain a little nervous however, and wanted to consult the community to get a view of whether this is a safe installation or not.

Attaching images..

[CanadianSpaTech]

Can't say I've ever seen without a ground wire.

[cranbiz]

Neither have I. I know that if it was my tub, I would feel better with one.

I'm not a licensed electrician though. 

[CanadianSpaTech]

Looks like green/ground is there and it is into the Neutral position. The only time I see 3 wire set ups if for Jacuzzi/Sundance where you would have the 2 hots.. red and black and also the green for ground without the neutral white. Was there a different spa connected to this wiring previously? I say that green should always be to ground and the spa is missing a neutral wire not a ground wire. You would have to look at the other end and see how it is wired.

[RDspaguy]

In the US, by code, a gfci can be used to protect a circuit with no ground. That was one of the original purposes they were designed for. Technically, the green wire should be taped with white phase tape at each end, but it works the same. I would still recommend a ground wire, as a gfci can fail, leading to a possible electrocution hazard. Make sure to test it frequently.

[Ajl500]

Thanks for the advice on this, sounds like it should be ok but I will look to get a local spa technician in to add the appropriate wiring. I don't know too much about the history of the spa but it's not a long run to the breaker so shouldn't be a big deal.