3.4.1 Power Surge Protection and Grounding
This section discusses power surge protection and grounding of MP-124.
Warning:
• Ensure that you connect MP-124 to an electrical socket outlet that
provides protective earthing (grounding). Prior to connecting power, refer
to the Regulatory Information provided in the User’s Manual.
For Finland: "Laite on liltettava suojamaadoituskoskettimilla varustettuun
pistorasiaan."
For Norway: "Apparatet rna tilkoples jordet stikkontakt."
For Sweden: "Apparaten skall anslutas till jordat uttag."
• MP-124 is immune against power surge levels of up to 1 Kilovolts (KV) as
required by the following standards: IEC 61000-4-5, EN 55024, and EN
300386.
• For installations where wires are routed outside the building, the
Telecommunication site must comply with ETS 300-253 “Earthing and
Bonding of Telecommunication Equipment in Telecommunication
Centers”.
• Power surges above protection levels as required by EN 55024/EN
300386 may cause damage to MP-124.
• MP-124 provides only Secondary Protection against power surges. In
deployments where the telephone lines are installed outside, you must
install Primary Protection against lightning. Only lightning protectors
recommended by AudioCodes must be used - specifically, manufactured
by Circa. Failing to install Circa primary surge protectors, failing to
comply with the grounding instructions or any other installation
instructions, may cause permanent damage to MP-124.
• As most of the installation is the responsibility of the customer,
AudioCodes can assume responsibility for damage only if the customer
can establish that MP-124 does not comply to the standards specified
above (and MP-124 is within the hardware warranty period).
Note: Proper grounding is crucial to ensure the effectiveness of the primary
protector and MP-124 must be connected to the equipotential ground bus (in
electrical switch board) that is connected directly to the grounding of the
foundation reinforcement conductor.
Before installation, loop-testing grounding measurements must be done by a
certified electrician to verify the quality of the grounding connection. The
grounding impedance must not exceed 0.5 ohm.
Lightning is the transient passage of electrical current between a cloud and the surface of
the earth. Part of the lightning current can be carried inside a building from electrical lines
and analog and/or digital telephone lines located outside. This direct injection of lightning
current inside a building can cause significant damage to electronic circuits and equipment.
To protect MP-124 from these power surges, MP-124 must be connected to an external
lightning protector. You must use a lightning protector of the type CIRCA 4B3S-75
manufactured by CircaTelecom (http://www.circatelecom.com). The connection must be
made using the terminal fixture of the type CIRCA 2625QC/QC or 26100QC/QC.
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