User's Manual

Grounding
Use of ground connections reduces the likelihood of problems in most telephony and data
systems. This is especially important in buildings where multiple items of equipment are
interconnected using long cable runs, for example phone and data networks.
All control units and external expansion modules must be connected to a functional ground.
Where the unit is connected to a power outlet using a power cord with an earth lead, the power
outlet must be connected to a protective earth.
In some cases, such as ground start trunks, in addition to being a protective measure this is a
functional requirement for the equipment to operate. In other cases it may be a locale regulatory
requirement and or a necessary protective step, for example areas of high lightning risk.
Warning:
During installation do not assume that ground points are correctly connected to ground. Test
ground points before relying on them to ground connected equipment.
Additional protective equipment
In addition to grounding, additional protective equipment is required in the following
situations.
• On any digital station or phones external expansion module connected to an extension
located in another building. See
Out of Building Telephone Installations on page 66.
• In the Republic of South Africa, on all analog trunk external expansion modules (ATM16)
and on any control units containing an analog trunk cards (ATM4/ATM4U).
Tools required
• M4 cross-head screwdriver
• Tools suitable for crimping a cable spade
Parts and equipment required
• 14AWG solid copper wire for ground connection
• Cable sleeve matching local regulator requirements. Typically green for a functional
ground and green/yellow for a protective ground.
The ground point on control units and expansion modules are marked with a
or symbol.
Ground connections to these points should use a 14 AWG solid wire with either a green sleeve
for a functional ground or green and yellow sleeve for a protective ground.
B5800 Branch Gateway control unit
On control units the ground point is located above the RS232 DTE port.
Grounding
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