Preventing Fire

[John506]

As some of you may have read from my last post I'm building a grow box for some tomato plants.

The lights I am using are 150w HPS and will be on for around 6 hours per day. Now I know that if I use propper battons, make tight connections and use correct gauge of wire, fire risk will be minimum, but I'm a bit of a worrier if they are on and I'm out.

Is there anything I can interrupt the line with which will prevent a fire, i.e cut out before it gets too hot. Not sure if an RCD would suffice for this?

 

[PrenticeBoyofDerry]

If the circuit is designed correctly by selections of correct size and suitable cable type for it's environment and the MCB/RCBO is selected to reduce the current to a safe rating for the cable to carry that current. You are part way there.
Then the choice of lighting and it's placement, avoiding combustible materials will also add to further prevention of a fire hazard.

Regulation 421.2;
In summary
The lights should be mounted on a support with low thermal conductance
Be screened by materials of low thermal conductance
Be mounted to allow safe dissipation of heat and at a sufficient distance from adjacent materials on which such temperatures have deleterious effects.

 

[ban-all-sheds]

... HPS ...

I thought you said that the problem was that the plants didn't flower?

I think you need to go back to basics, and ask advice on gardening fora.