Catalina Capri 22 Owner's Manual page 53

/
E-4
12/96
4.5 REQUIREMENTS- IN GENERAL
4.5.1 To provide a conductive path for the adequate
discharge of lightning currents, from the air terminal at the
top of a lightning mast to the water (ground), the system
shall
4.5.1.1 be essentially vertical, and
4.5.1.2 be essentially straight, and
4.5.1.3 have a conductivity not less than that of a #4
A WG (21.2mm
2
)
copper conductor, and
4.5.1.3.1 where the system consists of multiple shrouds,
stays and mast, they shall have an aggregate conductivity
not less than a #4 AWG (21.2mm
2
)
copper conductor.
4.5.2 Every metallic shroud and stay shall be
connected from the chain plate directly to the ground plate
or ground strip with a conductor at least #6 AWG
(13.3mm
2
).
4.5.3 No bend of a conductor shall form an included
angle ofless than 90°, nor
4.5.3.1 shall it have a radius of bend less than eight
inches (203mm).
4.5.4 Large metal objects such as tanks, engines, deck
winches, stoves, etc., within six feet (1.8m) of any
lightning conductor shall be interconnected by means of a
lightning bonding conductor at least equal to #6 A WG
(13.3mm
2
)
copper.
NOTES: 1. To minimize flow of lightning discharge
current througlt engine bearings, it may be preferable to
bond engine blocks directly to tlte ground plate rather
than to an intermediate point 011 the lightning protection
system.
2. Large metal bodies on boats include any
large masses such as bow and stern pulpits, steering
pedestals, horizontal guardrails, handrails on cabin
tops, smokestacks from galley stoves, electric winches,
davits, metallic hatches, metallic arches, towers,
engines, water and fuel tanks, and control rods for
steering gear or reversing gear.
3. It is 11ot inte11ded that small metal objects
such as compasses, clocks, gaUey stoves, medici11e
chests, and other parts of the boat's hardware be
grou11ded
4. For iUustratio11 purposes see Appendix,
Figure 1.
©
1996 American Boat
&
Yacht Council, Inc.
2
4.6 REQUIREMENTS- MATERIALS
4.6.1 Corrosion - The material used in a lightning
protective system shall be resistant to corrosion.
NOTE:
Where it is 11ecessary to joi11 dissimilar metals,
the corrosion effects can be reduced by the use of
suitable plating or by installing a metal jilting between
the two dissimilar metals that is galvanically compatible
with both metals.
4.6.2
Wire Conductors
4.6.2.1 Wire conductors shall be stranded copper.
4.6.2.2 Stranding of copper wire shall be Type ll
stranding in accordance with ABYC E-8, AC Electrical
Systems on Boats, and/or ABYC E-9, DC Electrical
Systems under
50
Volts.
4.6.3 Other Conductive Means
4.6.3.1 Conductivity shall be equal to, or greater than,
#6 AWG (l3.3mm
2
)
copper wire.
4.6.3.2 The thickness of metal ribbon or strip shall be at
least 1/32 inch (0.8mm).
4.6.3.3. Copper braid shall not be used.
4.7 REQUIREMENTS- INSTALLATIONS
4. 7.1 To minimize side flashes, and the induction of
high voltage to the boat's wiring, lightning conductors in
proximity to the boat's wiring shall not be routed in
parallel to the boat's wiring.
EXCEPTION: The primary lightning conductor.
4.7.2 Conductive Joints - Conductive joints shall be
made and supported in accordance with ABYC E-9, DC
Electrical Systems Under 50 Volts, and
4.7.2.1 shall have an electrical resistance not in excess
of that of two feet (0.6m) of the smaller diameter
conductor.
4.8 LIGHTNING PROTECTIVE MAST
4.8.1 The lightning protective mast shall be located so
that the cone of protection will cover the entire boat. See
Figure 1 and Figure 2.
4.8. 2 Additional lightning protective means shall be
erected to form overlapping zones of protection, to protect
a boat of the size that renders the use of a single mast
impracticable.