TP-5982 4/0634 Section 6 Electrical System
6.6 Battery
Batteries and their installation must conform to USCG
Regulations 183.420 (a) through (g). Provide generator
sets with batteries separate from the propulsion engines
whenever possible. The starting/charging systems of
both the generator set and the engine must have a
common negative (−) ground.
USCG Regulation 183.415, Grounding requires
connection of a common conductor to each grounded
cranking motor circuit. Size the conductor to match the
larger of the engine’s two battery cables. Figure 6-3 lists
recommended minimum cable sizes for generator set
battery connections at various generator set-to-battery
distances. Connecting a common conductor to each
grounded cranking motor circuit prevents the starting
motor current from using alternative electrical paths
should the cranking motor ground circuit be restricted or
open because of oxidation or loose hardware.
Alternative electrical paths include metallic fuel lines
that can pose a hazard. See Section 7, Installation
Drawings for battery connections to the generator set.
See Figure 6-4 for minimum cold cranking amps (CCA)
recommendations.
Required
Battery Cable
AWG Gage
(Minimum)
Distance (from battery to generator set)
2.5 m
(8.3 ft.)
5m
(16.4 ft.)
5--7.3E/4--6EF, 5--7.3ECD/4--6EFCD 6 4
10--15EG, 13/15EGZ 6 2
15--20C/12.5--16CF 4 2
Figure 6-3 Battery Cable Sizing Recommendations
12-Volt Starting Battery Size CCA
(at --18°C(0°F) or 100 Amp Hr)
Models CCA
5/7.3E and 4/6EF
5/7.3ECD and 4/6EFCD
10/13/15EG and 13/15EGZ 600
15/20C and 12.5/16CF 630
Figure 6-4 Battery Recommendations
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