Kohler 3.5CFZ User Manual download pdf (Page 75)

TP-5695 12/93 Installation 6-13

isolator or isolation transformer is referenced in ABYC

E-8.20 and ABYC E-8.11.

Generator sets installed in commercial vessels are

governedbyU.S.CoastGuardRegulations,Title46,the

American Bureau of Shipping, and Lloyd’s Register of

Shipping. Grounding of equipment is covered in ABS

35.9.6 and Lloyd’s Part 6,Chapter 2-1, Section 1.3. The

types of permissible neutral grounding of generating

equipment are referenced in ABS 35.125 and 35.95.1

andin Lloyd’sPart 6,Chapter2-1, Section 14.4.Ground

fault protection information can be found in Lloyd’s Part

6, Chapter 2-1, Section 14.5 and Part 6, Chapter 2-2,

Section 13.6.

Battery

BatteriesandtheirinstallationmustconformtoU.S.C.G.

Regulations 183.420 (a) through (g). Generator sets

should use batteries separate from the propulsion

engines whenever possible.Both the generator set and

the propulsion engines’ starting/charging systemsmust

have a common negative (--) ground.

U.S.C.G Regulation 183.415, Grounding, requires a

common conductor to be connected to each grounded

crankingmotorcircuit.Thisconductorshouldbesizedto

match the larger of the engines’ two battery cables.

(Cable sizes for generator set battery connections are

given in Figure 6-20.) This requirement prevents the

starting motor current from using alternative electrical

paths should the cranking motor ground circuit be

restricted or open due to oxidation or loose hardware.

These alternative electrical paths include metallic fuel

lines which can pose a fire hazard. See Figure 6-21 for

battery connections to generator set.

Distance Between

Generator Set and

Battery

At 0° F

(--18° C)

Cable

Size

(AWG)

At 32° F

(0° C)

At 75° F

(24° C)

40 ft. (12.2 m) 00 0 1

30 ft. (9.1 m) 0 1 2

25 ft. (7.6 m) 1 2 4

20 ft. (6.1 m) 2 2 6

15 ft. (4.6 m) 2 4 6

10 ft. (3.0 m) 4 6 8

5 ft. (1.5 m) 6 6 8

2.5 ft. (0.8 m) 8 8 8

Figure 6-20. Battery Cable Sizes

1. Battery Positive (+)

Connection

2. Battery Negative (--)

Connection

ADV-5792-D

Figure 6-21. Battery Connection Bracket

Wiring

All wiring must be stranded copper. Wire gauges and

insulation, conductor temperature ratings, sheath

stripping, conductor support and protection, conductor

terminals and splices, and overcurrent protection

(circuit breakers, fuses) must conform to U.S.C.G.

Regulations 183.425 through 183.460. Use rubber

grommets and cable ties, as necessary, to protect and

secure wiring from sharp objects, exhaust system, and

any moving parts.

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Kohler 3.5CFZ User Manual Page 75

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