IP Office Technical Tip

IP Office Bonding and Grounding (Earthing) for Customer Premises

This Technical Tip gives Business Partners detailed guidance on the requirement of electrical earthing for IP Office installations.



Grounding circuit continuity is necessary for safe operation of this telecommunications equipment. Never operate this telecommunications equipment with grounding conductor disconnected. Earth connection is essential before making any telecommunications network connections due to high leakage current and high touch current.


! Warning:

Failure to follow grounding recommendations can result is a system installation that is:



The earthing (grounding) and bonding of an Avaya Telephony system in customer premises shall follow national and/or local electrical codes/standards if these codes/standards exist. Examples of these codes are NFPA 70/NEC (USA), BS 7671 (UK IEE Wiring Regulations) and VDE 0100 (Germany). Examples of these standards are ANSI/TIA/ EIAJSTD-607-B, ANSI/TIA/EIA-568-C (USA), EN 50174-2 and EN 50310 (Europe) and IEC 60364-5-548 (International).



The first (A) is based on NFPA 70: National Electrical Code (NEC - a United States code).

Note: Compliance with NFPA 70: NEC - or - with the equivalent local electrical code / grounding requirements is mandatory.

The second (B) is based on ANSI/EIA/TIA-607 (Commercial Building Grounding (Earthing) and Bonding Requirements for Telecommunications).

Note: ANSI/EIA/TIA-607 (TIA-607) defines an intra-building ground-wiring scheme for communications equipment, and specifies equipment connection / grounding points according to that scheme. TIA-607 assumes the underlying building grounding infrastructure is in compliance with NFPA 70: NEC. Compliance with the NEC (or the equivalent local electrical code / grounding requirements) is essential for the proper application of TIA-607.

Compliance with NFPA 70: NEC will provide suitable grounding for the Avaya equipment. TIA-607 provides an enhanced, communications-specific grounding scheme: where TIA-607 has been implemented, the Avaya equipment shall be grounded per this method.




Recommended Grounding Solutions for IP Office

The IP Office Equipment must have a permanently connected, hard wired protective earth connection that remains installed correctly as per IP500V2 Installation documentation.

Specifically system grounding must adhere to the following requirements:

1According to the Telecommunications Industry Association (TIA), "Ground loop in an electrical system is an unwanted current that flows in a conductor connecting two points that are nominally at the same potential, i.e., ground, but are actually at different potentials"

Table 1 Area-specific ground wire requirements

Region Rules

Wire Size



#8 AWG (10 mm2)

green/yellow wire

Other areas in Europe

Not smaller than #6 AWG (16 mm2) at any point



Not smaller than #8 AWG (10mm2)

Two green/yellow wires


Not smaller than #6 AWG (16 mm2) at any point

ESD requirement in country



In buildings without a ground-cabling infrastructure meeting TIA-607 the Avaya equipment shall be grounded by connection to the nearest accessible location on one of the following approved building grounds:

Note: The following are approved grounds in keeping with the NFPA 70: National Electrical Code of the United States (NEC). For additional information regarding these grounds consult the NEC, Article 250.52.

This is the recommended location for grounding Avaya telephony equipment.

1. AC Service Panel:

! Danger !
Do not perform work inside electrical panels unless you are a qualified electrician. Do not try to remove bonding conductors without approval from qualified personnel.

As alternatives:

2. Metal Water Pipe:

The water pipe must meet all the following –

Where a metal water pipe is used as an approved ground the following requirements apply to the host building:

The building shall not rely only on the metal water pipe for grounding: a supplemental ground is required. (See NEC Article 250.53 for additional details.)

3. Metal Frame of the Building:

The metal frame member (I-beam, pillar) must be connected to earth by one of the following methods –

4. Approved floor grounds:

Floor grounds are those grounds on each floor of a high-rise building that are suitable for connection to the ground terminal in the riser closet and to the equipment single-point ground terminal. Approved floor grounds may include the following:

Figure 1 Method A -1 Connection to AC Panel Ground



In buildings where a ground-cabling infrastructure meeting TIA-607 has been implemented the Avaya equipment shall be grounded according to the TIA-607 standard. In a TIA-607 installation, the Telecommunications Main Grounding Busbar (TMGB) / Telecommunications Grounding Busbar (TGB) links the telecommunications equipment to the ground.

Other grounding terminology is:

Refer to TIA-607-B September 2011

Configure telecommunications subsystems, such as groups of frames or equipment, as separate single-point ground entities connected to the equipment¡¦s dedicated service panel via a single-point ground bar. The service panel ground connects to the building principle ground via the main service panel or, in a TIA-607 installation, via the TGB (Telecommunications Grounding Busbar).

Refer to Figure 2: Ground-cabling infrastructure meeting TIA-607

If the approved ground or approved floor ground can only be accessed inside a dedicated power equipment room, then connections to the ground must be made by a licensed electrician.