[CS Cruiser]

Exactly what Maine sail says, and also you may be using this for only 12V applications, cannot be used for any 120v or 240v wiring on your boat. Better to stick with 105c rated conductors as will be good also if you run thru engine compartment.
In the end best to have 105c-600v rated wiring.....

 

[CS Cruiser]

To my knowledge option C, TWT "thin wall tinned" is only rated at 60v.
Not 600v as option "A" is.

 

[CS Cruiser]

Option "A" will meet UL 1426, Option "C" will not a can only be used on 12-24v circuits

Electrical Cables for Boats

UL 1426

1 Scope

1.1 These requirements cover electrical cables for boats. The cables are intended for use in marine pleasure craft and consist of a single insulated conductor without a jacket or of two or more insulated conductors with or without an overall nonmetallic jacket. Each boat cable is rated as follows: 600 V; 60°C (140°F), 75°C (167°F), or 90°C (194°F) wet; and 60°C (140°F), 75°C (167°F), 90°C (194°F), or 105°C (221°F) dry. Boat cable dry-rated 125°C (257°F) or 200°C (392°F) may be investigated. A boat cable so marked has insulation (and jacket if a jacket is used) that is for use where exposed to oil at 60°C (140°F) and lower temperatures. Boat cables employ stranded copper conductors that are 18 - 4/0 AWG for multiple conductors and 16 - 4/0 AWG for single conductors.

1.2 The ampacity of a boat cable shall be as stated in the US Coast Guard regulations Title 33, Chapter I, Parts 183.430 and 183.435 of the CFR.

 

[CS Cruiser]

Good to,hear it is 600v rated, as many I've seen are stamped 60v for thin wall tinned, I just assumed your TWT might be the same and why it is likely cheaper.
PM me the specs or post them if you can.

 

[CS Cruiser]

NOT UL or ABYC approved
Tinned Copper Conductors - PVC Insulated
Improved high performance cable insulation gives considerable weight savings especially in large wiring harnesses
Hard grade PVC cable insulation offers good resistance to abrasion and cut through
The specification is printed on the outside of the cable insulation
Suitable for temperature from -40°C to +105°C with excursions to 120°C max
Good resistance to petrol, diesel, lubricating oils, diluted acids and moisture
Maximum voltage 60V, suitable for 12v and 24v systems (excluding Hi Tension circuits)
Manufactured in accordance with ISO6722 : 2006 (Class B)
Choice of standard sheath colours /li>
For most harsh environment applications especially where good resistance to corrosion is required

UL & ABYC APPROVED
UL approved tinned marine electrical cable benefits include:
Finely stranded ABYC (type III) tinned copper conductors
Extruded PVC Insulation gives weight savings especially in large wiring harnesses
Boat cable specification is printed on the outside of the cable insulation
Suitable for temperature from -20°C to +105°C dry (+75°C wet)
Good resistance to petrol, diesel, lubricating oils, diluted acids, flame and moisture
Maximum voltage 600V
Suitable for 12v & 24v systems (excluding Hi Tension circuits)
Flat cables compliances: UL Standard 1426, ABYC: E-11.16, USCG: 33 CFR part 183 and NMMA
For most harsh environment applications especially where good resistance to corrosion is

 

[CS Cruiser]

PM replied too.

 

[CS Cruiser]

This is from Best Boat Wire,

So what is the big deal with UL 1426 Boat Wiring?

UL 1426 Boat Cable is designed to survive the harsh conditions in and around the marine environment including felxible tinned copper stranding and a durable water and chemical resistant insulation.

It's just not worth taking the chance on wiring your boat with inferior wiring and cables that don't meet the standards provided for by today's marine electrical regulations.

Within the boating world there are regarded sources for safety information and "best practices". The American Boat and Yacht Council (ABYC), The United States Coast Guard (USCG), and the Society of Automotive Engineers (SAE) have paved the way for safer marine electrical installations by issuing safety standards and guidelines for manufacturers, service technicians, and boat owners.
In accordance with testing and evaluation over the years, certain desirable characteristics have been isolated for marine battery cable which are crucial to a safe, long lasting electrical installation. When it comes to wire for boats, the decisive standard is the BDFX.GuideInfo for Boat Cable. It pulls together some of the SAE and USCG best practices and product evaluations to create a more complete safety standard with what should be expected from a quality marine cable.

From the BDFX.GuideInfo for Boat Cable
The basic standard used to investigate products in this category is UL 1426, "Electrical Cables for Boats." Cable rated 600 V is investigated to UL 1426 . Cable rated 50 V is investigated to SAE J1127, J1128, or J378b

The UL 1426 "Electrical Cables for Boats" allows the marking of the jacket on UL1426 cable to state UL 1426, or Boat Cable, or BC-5W2 with the UL mark in the legend of the wire. In order for a cable to become listed under UL 1426 it has to undergo numerous tests. This is from the table of contents for UL 1426 and will give you an idea of the testing done by the UL before it gives it's "seal of approval":

PERFORMANCE

Physical Properties of Insulation and Jacket
Conductor Corrosion
Heat-Shock Test
Flexibility Test
Deformation Test
Cold-Bend Test
Vertical Flame Test (Inulated Conductors)
Cable Flame Test (Completed Cable)
VW-1 Flame Test
Relative Permittivity Test
Dielectric Voltage-Withstand Test and Alternatives
Insulation Resistance Test at 60F (15.6C)
Insulation Resistance Test and Elevated Temperature
Now that's an impressive list of testing to make sure that you're getting a quality cable, so keep that in mind next time you see a cable which is UL listed to UL 1426 and carries the marking "Boat Cable" or "BC-5W2" and the UL mark. There are only a few manufacturers of UL listed Boat Cable and their products are of high quality and meet those stringent standards.

 

[CS Cruiser]

An update to my previous pm, as you noted in original post option "B" is only available in black.

 

[CS Cruiser]

Glad it worked out for you.