Earthquake Resistance; Site Level Power And Grounding; Power Plant Configuration - Nortel SL-100 Product Manual

86 Cabinet modular hardware
All cabinets meet the requirements of the Federal Communications
Commission (FCC) Part 15 EMI compliance.

Earthquake resistance

Each steel cabinet is constructed of two single-piece side members joined to
a specially reinforced base that provides resistance to earthquake vibration
damage. Bolting two or more reinforced cabinets together improves
earthquake resistance.
Among other things, the New Equipment Building Specifications (NEBS),
Applied Technology Council (ATC), and Uniform Building Codes (UBC)
establish seismic (earthquake) zoning.
Earthquake risk zones are considered to be ATC Zone 6 and 7, UBC
Zone 4, and NEBS Zone 4. In these zones, a minimum of 3000 psi
concrete strength at 5.5 in. of concrete thickness is required to meet the
specifications of the cabinet floor anchors.
Assuming the building that houses the cabinets is not destroyed, damage
resistance is provided against forces up to 150 percent of (NEBS) Zone 4
and ATC 3-06 specifications.
The cabinet also exceeds the NEBS tipping specification, therefore, the
cabinet requires four bolts and anchors for fastening to a solid floor in
earthquake risk areas. In earthquake risk areas where raised flooring is
used, a consulting engineer should supervise the installation of a suitable
base structure.

Site level power and grounding

Meridian SL-100 systems are powered by an external, customer provided
power plant. All Meridian SL-100 system installations require a -48 V power
source. Meridian SL-100 systems use an Isolated Bonding Network (IBN)
but can share power plant facilities with Common Bonding Network (CBN)
equipment. Equipment lineups are individually grounded through the frame
ground equalizer to a single point ground.
Power plant configuration
The operating range for Meridian SL-100 systems is -43.75 V to -55.8 V
measured at the input terminals of Meridian Cabinet Auxiliary Modules
(MCAM).
Power is usually supplied by a centralized power plant, which is shared
with other systems or is dedicated. Terminal equipment, such as display
terminals and printers, is considered to be an integral part of the Meridian
SL-100 system and is powered by AC power.
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Meridian SL-100 Product Guide
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