Alpha Technologies Te43 - Manual (Page 27)

Alpha Technologies Ltd. 057-104-C0 Rev B WC
Burnaby, British Columbia. Telephone: 604 436 5900 Fax: 604 436 1233. Page 22 of 27
4.5 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 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.
4.5.1 Site ground wire entry
External ground studs are located at the bottom front and rear
of the enclosure. Use these to make 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.
4.5.2 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.
4.5.3 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 16 – Enclosure
ground connections
Ground studs
MGB