Hall Research VSA-31 - Manual (Page 5)

A / V Switch-Cat TM
5
3.0 Installation
In a typical installation, the Sender unit is located on a wall or panel and
is wired to the remote Receiver unit via 2 Cat5 cables.
The sender qualifies as a low-voltage class 2 device and does not require
a J-box. In fact it does not even need a power supply to be connected to it,
as it draws power via the signal connection to the remote unit. However,
in most instances it is easier to use a standard 4-gang electrical box in
order to attach the faceplate to the mounting surface or structure.
Please contact HRT or your desired electrical supply house for purchasing
the J-box. These are generally inexpensive units.