Cabling The Device - AudioCodes Mediant 500Li Metal MSBR Hardware Installation Manual

Cabling the Device

6 Cabling the Device
This chapter describes device cabling.
6.1 Grounding and Surge Protection
The device must be connected to earth (grounded) using an equipment-earthing conductor.
◼ The equipment is classified as Class I EN 62368-1 and UL 62368-1 and must be earthed at all times.
For Finland: "Laite on liltettava suojamaadoituskoskettimilla varustettuun pistorasiaan."
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For Norway: "Apparatet rna tilkoples jordet stikkontakt."
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For Sweden: "Apparaten skall anslutas till jordat uttag."
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◼ The device must be installed only in telecommunication sites / centers in compliance with ETS 300-253
requirements "Earthing and Bonding of Telecommunication Equipment in Telecommunication Centers".
◼ Prior to installation, earth loop impedance test must be performed by a certified electrician to ensure grounding
suitability at the power outlet intended to feed the unit. It is essential that the impedance will be kept below 0.5
ohms!
Proper grounding is crucial to ensure the effectiveness of the lightning protection, connect the device permanently
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to ground (as described in the procedure below). The device's grounding screw must be connected to the
equipotential grounding bus bar located in the Telecommunication rack or installation site, using a wire of 6 mm
surface wire. If the device is installed in a rack with other equipment, the rack must be connected to the
equipotential grounding bus bar of the Telecommunication room, using a stranded cable with surface area of 25
2
mm . The length of this cable must be as short as possible (no longer than 3 meters).
The device does not include primary telecom protection! When the FXO or DSL telephone lines are routed outside
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the building, additional protection - usually a 350V three-electrode Gas Discharge Tube (GDT) as described in ITU-T
K.44 - must be provided at the entry point of the telecom wires into the building (usually on the main distribution
frame / MDF), in conjunction with proper grounding. The center pin of the GDT (MDF grounding bar) must be
connected to the equipotential grounding bus bar of the Telecommunication room.
◼ Failing to install primary surge protectors and failing to comply with the grounding instructions or any other
installation instructions, may cause permanent damage to the device!
As most of the installation is the responsibility of the customer, AudioCodes can assume responsibility for damage
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only if the customer can establish that the device does not comply with the standards specified above (and the
device is within the hardware warranty period).
◼ The device complies with protection levels as required by EN 55024/EN 300386. Higher levels of surges may cause
damage to the device.
◼ To protect against electrical shock and fire, use a minimum of 26-AWG wire size to connect the FXO / DSL ports.
To earth the device:
1. Connect an electrically earthed strap of 16 AWG wire (minimum) to the chassis' earthing screw (located on the rear panel), using
the supplied washer.
2. Connect the other end of the strap to a protective earthing. This should be in accordance with the regulations enforced in the
country of installation.
Protective Earthing
Grounding and Power Surge Protection
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Mediant 500Li
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