A twenty-inch by four-inch by one-quarter-inch tinned copper bus bar mounts on isolated stand-off insulators with pre-drilled holes for dual hole mounting lugs. The assembly connects to one three-zero American Wire Gauge insulated stranded copper conductor routed vertically to the furthest riser telecommunications ground busbar in a one-inch conduit. Additional connections include a three-zero American Wire Gauge conductor bonded to the nearest building structural steel and electrical panel ground bus. A telecommunications grounding equalizer horizontally interconnects ground busbars on select levels using irreversible high compression tap fittings.
G G G G G G G G G G G G G G G G G G 7 7 1 5 6 4 3 2 KEYNOTES: 1. RISER-TBB: PROVIDE (1) #3/0 AWG INSULATED STRANDED COPPER CONDUCTOR VERTICALLY TO THE FURTHEST RISER TGB FROM TMGB. CABLE SHALL BE INSTALLED IN 1" (25mm) CONDUIT. 2. PROVIDE (1) #3/0 AWG INSULATED STRANDED COPPER CONDUCTOR BONDED TO NEAREST BUILDING STRUCTURAL STEEL. CABLE SHALL BE INSTALLED IN 1- INCH CONDUIT, IF ROUTED OUTSIDE OF ROOM. 3. PROVIDE (1) #3/0 AWG INSULATED STRANDED COPPER CONDUCTOR BONDED TO NEAREST ELECTRICAL PANEL GROUND BUS. CABLE SHALL BE INSTALLED IN 1-INCH CONDUIT. 4. TGB: PROVIDE (1) 20" X 4" X 1/4" TINNED COPPER BUS ON ISOLATED STAND-OFF INSULATORS. GROUND BUS SHALL HAVE PRE-DRILLED HOLES FOR DUAL HOLE MOUNTING LUGS. 5. TAP CONDUCTOR: PROVIDE (1) #3/0 AWG INSULATED STRANDED COPPER CONDUCTOR FROM TBB TO THE TGB. CABLE SHALL BE ROUTED IN 1" (25mm) CONDUIT IF ROUTED OUTSIDE OF ROOM IN RETURN AIR PLENUM OR EXPOSED TO PUBLIC VIEW. 6. TAP FITTING: PROVIDE IRREVERSIBLE HIGH COMPRESSION FITTING. 7. TELECOMMUNICATIONS GROUNDING EQUALIZER: (1) # 3/0 AWG INSULATED STRANDED COPPER CONDUCTORS HORIZONTALLY INTERCONNECTING TELECOMMUNICATIONS GROUND BUS (TGB) ON SELECT LEVELS, AS INDICATED ON GROUNDING ONE-LINE. CABLE SHALL BE INSTALLED IN 1" (25mm) CONDUIT IF INSTALLED IN RETURN AIR PLENUM OR EXPOSED TO PUBLIC VIEW. TELECOM GROUND BUSBAR (TGB) SYMBOLS: G.01 # TGB I-TGB
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