Appendix C, Bonding & Grounding of Battery Rack

APPENDIX C

BONDING & GROUNDING OF BATTERY RACK

INTRODUCTION

1. To insure personnel safety, and equipment protection, operation, and reliability, the battery rack should be connected to the Common Bonding Network (CBN).

2. Electrical continuity between modules is provided through the use of serrated hardware. Testing has shown that standard sys- tems are compliant with the GR-1089-CORE, Issue 4, Section 9 requirements of the Bonding and Grounding tests.

GROUNDING KIT INSTALLATION (OPTIONAL)

1. Each kit consists of the following components:

(2) #6 AWG, 12 in. 90°C cables

(4) “C” shaped beam clamps

(4) 1/4-20 x 0.75 in. bolts

(4) 1/4-20 x 1.00 in. bolts

2. Using (1) 1/4-20 x 1.00 in. bolt per beam clamp, connect (1) beam clamp to the I-beam flange and (1) beam clamp to the back flange of the module (see Figure 1). Be sure to securely tighten the bolts such that the paint is penetrated (see Figure 2).

3. Attach each end of cable assembly to a beam clamp using (1) 1/4-20 x 0.75 in. bolt per end (see Figure 3). Tighten hardware securely. 4. Repeat Steps 2 and 3 for the second horizontal support (I-beam).

Figure 1: Beam Clamp Installation

Figure 2: Adequate Paint Penetration

Figure 3: Cable Assembly Installation

CONNECTING TO THE CBN

1. The recommended location for attaching the frame ground is the back “C” channel on the upper module of the stack (see Figure 4).

Figure 4: Recommended Frame

Ground Location

2. Once the location is determined, it will be necessary to drill (2) holes for the frame ground conductor/lug (installer supplied). Note, hole size and spacing will be dependent on the lug.

3. Using a grinder, etc., remove the paint from around the holes drilled in Step 2.

Apply a thin film of NO-OXID grease to the bare metal and attach the frame ground conductor/lug. 27