System Application Guide
SAG582127000
Spec. No. 582127000 (Model 721
NPBB
)
Issue AF, February 26, 2014
Page 77 of 125
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Wiring Illustrations and Notes
Relay Rack Frame Grounding Requirements
For relay rack grounding requirements, refer to the current edition of the American National Standards
Institute (ANSI) approved National Fire Protection Association's (NPFA) National Electrical Code (NEC),
applicable local codes, and your specific site requirements.
A customer's grounding network lead can be attached to the top of each relay rack. Provision is made for
installing a lead with a two-hole lug that has 1/4" bolt clearance holes on 5/8" centers. Refer to Table 7 for lug
selection.