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If the box is metal then yes. Assuming by grommet you mean something that will protect the Non metallic wire from rubbing up against the metal edge of the box where the wire pulls through into the box. This is accomplished in one of two ways. Using a plastic "Grommet" as you are calling it which lines the hole and often grabs the wire, or by using a metal connector ring that lines the hole and grabs the wire and holds it into place. Some steel boxes come with a mechanism for grabbing the wire built into the box. That is all you need if your box comes with such a device. If not, you are supposed to install one yourself when you install the wire.

In practice you will find when you open metal switch boxes that often this wire protecting/securing device has been omitted or ignored. While you do find this situation often in the field, it is incorrect.

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