Trace Engineering Mariner - Ac Wiring; Table 7 Flexible Cable for Marine Applications; Table 8, Conductors for Marine Applications

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This sections describes AC wiring requirements and recommendations including cable sizing, flexible
cable, marine conductors, overcurrent devices, GFCI’s, hookup procedure, and neutral-to-ground
switching.
UL, ABYC and Federal Regulations define the standards for AC installation wiring in vessel
applications. Never use Romex ™ type single-strand cable. Use only multi-strand conductors of the
type listed in the following tables. Temperature ratings shown assume the routing of wires above
bilge water in locations protected from dripping and exposure to weather, spray, and oil.
Table 7 Flexible Cable for Marine Applications
Type Description Temperature Rating
SO Hard Service Cord, Oil Resistant Compound 60ºC and up (140º F and up)
ST Hard Service Cord, Thermoplastic 60ºC and up (140º F and up)
STO,SEO Hard Service Cord, Oil Resistant Thermoplastic 60ºC and up (140º F and up)
SJO Junior Hard Service, Oil Resistant Compound 60ºC and up (140º F and up)
SJT Junior Hard Service, Thermoplastic 60ºC and up (140º F and up)
SJTO Junior Hard Service, Oil Resistant Thermoplastic 60ºC and up (140º F and up)
Table 8, Conductors for Marine Applications
Type Description Temperature Rating
THW Moisture and Heat Resistant Thermoplastic 75ºC (167º F)
TW Moisture Resistant Thermoplastic 60ºC (140º F)
HWN Moisture and Heat Resistant Thermoplastic 75ºC (167º F)
XHHW Moisture and Heat Resistant, Cross-linked
Synthetic Polymer
90ºC (194º F)
AWM Moisture, Heat and Oil Resistant Thermoplastic,
Thermosetting
105ºC (221º F)
UL 1426 Boat Cable 105ºC (221º F)