Alpha Technologies AlphaGen PN-6x-T 7.5kW 48Vdc - Manual (Page 28)

28 042-288-B0-001, Rev. A2
2.0 Site Preparation, continued
2.6 Grounding Requirements, CE-3x2 5K-T
The ground rod system is typically used in remote applications where the generator is located
away from the power supply enclosure and exposed to lightning strikes, or coincidental
surges. The wiring interface between the DC Genset and system carries a system ground to
ensure common ground between both cabinets and communication devices. The remote APU
cabinet ground rod serves only as an alternate discharge path.
Alpha Technologies recommends using the grounding method illustrated below. The grounding method for a particular site will be
dependant upon soil type, available space, local codes, NEC (National Electric Code), and other site- specific characteristics.
Alpha Technologies recommends 5 ohms minimum ground resistance between enclosure and ground rods, in accordance with IEEE
1100-1999 Powering and Grounding Electronic Equipment. NEC minimum grounding standard is 25 ohms.
Alpha Technologies assumes no responsibility or liability for failure of the installer to comply with the requirements of all applicable local
and national codes. Where allowed, exothermic welding may be used as an alternative to Burndy clamps and connectors.
Fig. 2-11, Enclosure Grounding, CE-3x2 5K-T
(for reference only)
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7
8
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4
3
10
1
2
6
NOTE:
Service grounding (required). #6AWG Copper wire from
service entrance ground bar.
Two ground rods, 6' apart
Lightning protection (optional). 1/2" x 8' Copper ground
rods, 4 places.
Burndy YGHP58C2W-3 or equivalent compression ground
tap connector
#6 bare copper wire from loop to enclosure ground bar
1
2
3
4
5
Burndy YGHP58C2W-3 or equivalent compression ground
tap connector
Terminate at ground bar
Terminate at ground bar
#6 bare copper loop terminated at each ground rod, 30” below
grade (min). Corrosion-proof (25 yr. life-span) connections
suitable for direct burial MUST be used
#2 AWG wire
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9
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