Brother Backup Battery Owner's Manual page 147

For Your Safety
To ensure safe operation the three-pin plug supplied must be inserted only into a standard three-pin
power point which is effectively grounded through the normal household wiring.
The fact that the equipment operates satisfactorily does not imply that the power is grounded and
that the installation is completely safe. For your safety, if in any doubt about the effective grounding
of the power, consult a qualified electrician.
Disconnect device
This product must be installed near a socket outlet that is easily accessible. In case of emergencies,
you must disconnect the power cord from the socket outlet in order to shut off power completely.
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Important Safety Information