the switch is for outside. the cable is three core weather proof that came with both filter and lamp. at the moment the feed is from a plug socket in the shed, but will eventually be wired into the sheds fuse box (by an electrician).
i have just installed a pond,with a pump and uv filter. however, i've got a 2 gang 1 way light switch to wire them both to at the pond. a feed has come from the shed. how do i wire it please???