Avaya S8100 User Manual

Check AC power and ground for CMC1

An approved ground is the closest acceptable medium for grounding the building entrance protector, 
entrance cable shield, or single-point ground of electronic telephony equipment. If more than one type of 
approved ground is available on the premises, the grounds must be bonded together as required in 
Section 250-81 of the National Electrical Code.

Grounded Building Steel – The metal frame of the building where it is effectively grounded by 1 of the 
following grounds: acceptable metallic water pipe, concrete-encased ground, or a ground ring.

Acceptable Water Pipe – A metal underground water pipe, at least ½ inch (1.3 cm) in diameter, in direct 
contact with the earth for at least 10 feet (3 m). The pipe must be electrically continuous (or made 
electrically continuous by bonding around insulated joints, plastic pipe, or plastic water meters) to the 
point where the protector ground wire connects. A metallic underground water pipe must be 
supplemented by the metal frame of the building, a concrete-encased ground, or a ground ring. If these 
grounds are not available, the water pipe ground can be supplemented by 1 of the following types of 
grounds:

Other local metal underground systems or structures – Local underground structures such as tanks 
and piping systems

Rod and pipe electrodes – A 5/8-inch (1.6-cm) solid rod or 3/4-inch (2-cm) conduit or pipe 
electrode driven to a minimum depth of 8 feet (2.4 m)

Plate electrodes – Must have a minimum of 2 ft

2

 (0.185 m

2

) of metallic surface exposed to the 

exterior soil

Concrete Encased Ground – An electrode encased by at least 2 inches (5.1 cm) of concrete and located 
within and near the bottom of a concrete foundation or footing in direct contact with the earth. The 
electrode must be at least 20 feet (6.1 m) of 1 or more steel reinforcing bars or rods ½ inch (1.3 cm) in 
diameter, or at least 20 feet (6.1 m) of bare, solid copper, 4 AWG (26 mm

2

) wire.

Ground Ring – A buried ground that encircles a building or structure at a depth of at least 2.5 feet (0.76 
m) below the earth’s surface. The ground ring must be at least 20 feet (6.1 m) of 2 AWG (35 mm

2

), bare, 

copper wire.

If the approved ground is inside a dedicated equipment room, then these connections must be made 
by a qualified electrician.

Floor grounds are those grounds on each floor of a high-rise building that are suitably connected to the 
riser closet’s ground terminal and to the cabinet’s single-point ground terminal. Approved floor grounds 
may include:

Building steel

The grounding conductor for the secondary side of the power transformer feeding the floor

Metallic water pipes

Power-feed metallic conduit supplying panel boards on the floor

A grounding point specifically provided in the building for the purpose