We have a 30 amp circuit serving a pottery kiln housed in the attached garage. It is currently used very infrequently. We also have a need to run electricity to a couple of workshops in the garden. Could we extend that circuit to the workshops, and promise ourselves never to fire the kiln whilst using the workshops, or, if not, is there a neat way to utilise the circuit serving the kiln to take power to the workshops, in such a way that should we ever need to use the kiln, we could disconnect the workshops and reconnect the kiln? Currently the kiln is hard wired into a big switch on the wall in the garage.