Electrical question about Ground

I am building my grow room in my basement under the stairs and landing. There was an electrical wire that ran across the ceiling of the room between the floor joists in flexible metal conduit. I killed the main on the house and then cut the conduit. Inside there was only 2 wires, a black and a white, no ground. I then spliced in a junction box and wired in a plug. My question is: Is this too dangerous to be doing with this outlet that is not grounded? I am planning on a very small grow operation. The following is everything that I plan on having plugged into those 2 outlets. 1 150w hps light, 2 small pumps, 2 small room fans, 2 small computer fans to bring in fresh air, and an Aerogarden setup for my mother / clones. I am planning on having 2 power strips plugged into this outlet and both have built in surge protectors. Please Advise. Chet

Im a Electrician in England, so cabeling is different over here, but whenever steel conduit is installed the conduit has to be earthed (you say grounded) so i take it the conduit was carrying the earth and at the socket point there would be a fly lead to the earth terminal.. hope this helps but im only guessing as have never been to states.

yeah i think basically if you ground your outlet that you installed to the junction box it will use the conduit as the ground? i believe this is what septimus is saying....

Looks like I'm going to have to ask where a person is from now on when giving electrical advice, keep forgetting people are on here from around the world.

Years ago, 2 wire runs were the norm. So yes it is safe, it is just safer with the ground and if you are worried too much about it you can install a GFI socket and that will cover you. I think of ground as a backup neutral although technically it isn't and someone will probably want to argue for hours about it, that's how I look at it.

Aslong as you do a good wiring job you should be allright

yea, the mc will act as your ground, you must be using old bx cable. just pigtail the ground from the receptacle to the box and youl be fine

Hello to everybody, I am new here. Looklike lots of good info. I would not rely on the armoured cable for a ground unless you check to make sure that all the cable connectors and locknuts are tight downline (towards the panel). If any of them are lose you lose your ground. The best way is to install a GFI receptacle. As far as loading goes try to figure out what is on that circuit already by finding the breaker for that circuit. Maybe it is labeled properly and give you an idea what is on it. You do not want to load it up past 12 amps or about 1400 watts if it is a 15 amp breaker.
Hope that helps.