Tainet VENUS 2908-4S4O, Руководство пользователя

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Chapter 2 Hardware Installation
19

Several ground rods, connected together, buried outside the building at
least 8 feet (2.44 meters) deep in the earth.

A wire (see tables 250-94/95 of the NEC handbook for gauge) that
surrounds the outside of the building and is buried at least 2.5 feet (.76
meters) deep in the earth.

If you are unsure whether the electric service in your building is properly
grounded, have it examined by your municipal electrical inspector.

Install a surge protector between the device and Ground point. Any
additional computer equipment you have connected to the device
(directly or through another device), such as a terminal or printer should
also be plugged into the same surge protector. Make sure that the surge
protector is properly rated for the devices you have connected to it.

Call your telephone company and ask them if your telephone line is
equipped with a circuit surge protector.

If you are operating the device in an area where the risk of electrical
surges form lightning is high, disconnect the device from the telephone
line at the rear panel when it is not in use.
Note:
The three grounding devices described above should be
firmly placed in the earth. Soil conditions should not be
dry where the device is buried.