Alpha Technologies Te45 - Manual (Page 32)

Alpha Technologies Ltd. 057-106-C0 Rev D
Burnaby, British Columbia. Telephone: 604 436 5900 Fax: 604 436 1233. Page 23 of 38
4.11 Grounding
DANGER: An enclosure that is not properly grounded presents an electrical hazard.
A proper grounding system that meets or exceeds the specifications of the equipment must be designed and
installed prior to or in conjunction with the construction of the mounting pad. The ground system must be bonded to
the enclosure to ensure a “common” or “single-point” ground.
Examples of grounds:

New builds – a buried ground ring with a bare, solid conductor going to ground rods.

Rooftop – a connection to the building’s steel structure, water pipes, etc.

Refer to local codes and practices for proper acceptable grounding arrangements. Only a licensed electrician
should be used to install the grounding system. Use a dedicated ground rod for the AC panel.
CAUTION: Do not route AC and DC wiring in the same conduit.
4.11.1 Site ground wire entry
External ground studs are located at the bottom front and rear of the
enclosure. Use these for the site ground wire connections. Terminate
either the front or rear connection to the external ground ring with an
exothermic connection. A minimum of #2 AWG solid wire is required.
4.11.2 Master ground bus (MGB)
The master (main) ground bus is located at the lower left front corner
of the enclosure. Terminate the MGB to the external ground ring with an exothermic connection. A minimum of #2
AWG solid wire is required.
4.11.3 Enclosure chassis ground
The enclosure chassis ground is pre-installed at the factory. It is connected to the enclosure frame and equipment
racks and is terminated to the MGB inside the enclosure.
External chassis ground
connected to site ground.
There are two connection
points, one at the front of
the enclosure, and one at
the rear. Only one
connection is required
with an exothermic
connection.
Ground wire that
connects the site ground
to the master ground bar
Figure 21 – Enclosure
ground connections
Ground studs
MG
B