Can I connect the DCS to the ground from a water heater?

Konstantin asks:
Good afternoon. During the repair, they did not make the control system. Question santechkorobe there is a flow heater, an inextricable wire from the shield goes to it. Is it possible to take this land from a drifter, and make a DCS on its base and connect a drifter to it?
The answer to the question:
Good afternoon, no. If you are already doing something similar to what you are writing, then take the earth that enters the room, put the DCS box, the shred in it, from the shred, dissolve the earth on a groove and on equalization of potentials. Although this is not entirely correct, if contact with the incoming protective conductor is lost, then during the breakdown of the heater, everything that is connected to the control system will be energized.
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