12 AC power system description
Figure 4
Grounding and equalizing nodes
-----H--s------------H--s-------99
11
Building groundBuilding ground
EaZhEaZh
rodrod
hems:
1.
An equalizing node for the Meridian SL-1 system may be obtained through the ACEG
the AC panel. ff isolation as per NEC 384-127 (exception 1) cannot be provided,
an alternate low impedance connection to the building ground may be required.
In either case there are many constraints which must be observed. such as:
2,3 The NEC and CEC require exposed metal (Meridian 1 cabinet) be grounded by an
ACEG
4.
Stray connections to a foreign ground will bypass the single point concept.
In high rise buildings large potentials can exist between an ACEG and other
grounds including building steel.
Power engineering 553-3001-l 52
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