Grounding and Surge Protection
The device must be connected to earth (grounded) using an equipment-earthing conductor.
Protective Earthing
The equipment is classified as Class I EN 62368-1 and UL 62368-1 and must be earthed at all times.
Finland: "Laite on liltettava suojamaadoituskoskettimilla varustettuun pistorasiaan."
Norway: "Apparatet rna tilkoples jordet stikkontakt."
Sweden: "Apparaten skall anslutas till jordat uttag."
Grounding and Power Surge Protection
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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". |
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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! |
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Proper grounding is crucial to ensure the effectiveness of the lightning protection, connect the device permanently 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 mm2 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 mm2. The length of this cable must be as short as possible (no longer than 3 meters). |
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The device does not include primary telecom protection! When the FXO telephone lines are routed outside 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. |
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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! |
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As most of the installation is the responsibility of the customer, AudioCodes can assume responsibility for damage 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). |
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The device complies with protection levels as required by EN 55035 / EN 300386. Higher levels of surges may cause damage to the device. |
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To protect against electrical shock and fire, use a minimum of 26-AWG wire size to connect the FXO ports. |
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To avoid electric shock and/or damage to ports due to over-voltage phenomena, you must connect the device to a reliable ground using the grounding termination located on the device's rear panel. |
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When the device is powered only from the 12V DC supply (utilizing the external power adaptor), the device is not grounded! |
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Ground the device prior to connecting the telephony port interfaces (FXO, FXS, E1/T1 and BRI). |
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When powering off the device, prior to disconnecting the ground cable at the rear panel ((if required), remove all telephony interface cables. |
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Connect an electrically earthed strap of 16 AWG wire (minimum) to the chassis' grounding screw (located on the rear panel), using the supplied washer and fasten the wire securely using a 6-32 UNC screw. |
Grounding the Device
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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. |