Mechanical
This section describes how to wall-mount the ZHM enclosure, the enclosure materials and important safety
considerations when connecting the ZHM to external systems.
Enclosure & Label Material
The ZHM is housed in an IP67 water and dust proof enclosure to provide maximum safety, flexibility and
reliability. The enclosure material is polycarbonate plastic, which is resistant to a variety of chemicals, oils and
detergents.
The front label is made from polycarbonate. There will be two or more labels on the back of the enclosure,
depending on the model selected. The compliance label is made from PVC and the serial number label is made
from polyethylene film.
Mounting Instructions
The ZHM product range will have two (ZHM-20) or three (ZHM-21) cable glands at the bottom depending on the
model.
The ZHM requires 2 screws for mounting. These screws can be preinstalled on a vertical surface spaced 122mm
vertically apart. The head of the screw should be less than 8.5mm in diameter and the screw thickness should be
less than 4.5mm. The screws should be left unscrewed by more than 5 mm before installing the enclosure.
Important Safety Note
The enclosure of the ZHM must not be drilled, cut or modified in any way for mounting or
connecting to external systems.
All parts of the circuit within the enclosure must be considered to be at dangerously high
mains voltage when the unit is connected to a mains voltage source. Modifying the
enclosure could expose parts of the system to users, or cause an internal fault or short
circuit.
There are no user-serviceable parts inside the ZHM enclosure, and it should always be
isolated from mains voltages before opening the enclosure lid.
Opening the Enclosure
To make connections to the ZHM, it is necessary to open the lid of the enclosure. This is fastened with four
screws that are accessible from the back of the enclosure. This should only be done by qualified personnel, and
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