The grounding electrode system connects to the main service disconnect via grounding conductors sized per NEC 250.66. The main bonding jumper ties the equipment grounding bus to the neutral at the main service. Additional grounding connections link to building steel, a water main, and a 30-foot Ufer ground. An intersystem bonding terminal and telecommunications main grounding bus tie into the grounding network with copper conductors sized according to run length.
M BLDG STEEL WATER MAIN 1 1 2 2 30’−0" UFER NOTES: 1 SIZE PER NEC 250.66. 2 PROVIDE GROUNDING/BONDING SYSTEM CONNECTIONS TO MAIN ELECTRICAL SERVICE AT THE LOCATION OF THE THE MAIN SERVICE DISCONNECT. EGB MBJ NEUTRAL MS CTE #6CU TMGB 2/0 IBT BC BC CONDUCTOR SIZE d 25’−#4 CU d 50’−#1 CU d 75’−#2/0 CU > 75’−#3/0 CU NOTES: TMGB −TELECOMMUNICATIONS MAIN GROUNDING BUS. IBT −INTERSYSTEM BONDING TERMINAL. BC −BONDING CONDUCTOR. MBJ −MAIN BONDING JUMPER EGB −EQUIPMENT GROUNDING BUS
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