And more... out of context from your references
... you should read them and follow through with the references the references make... and since they are all posted on the internet
... copy and paste them... and keep on going:
(But at least we have context to argue about that we can quickly reference.)
"When AC and DC conductors are run together, the AC conductors shall be sheathed, bundled, or otherwise kept separate from the DC conductors.” 188.8.131.52.5."
Diodes are used in DC applications.
Lets look at the standards for DC applications... please I get an email
for everyone of these: OMG: I still think 3.4 volts is a bit lower that 50 to 600V... still ...
Here is the UL 1426 requirement that the ABYC uses:
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: 50 or 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 are 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
1.2 The construction and performance details of single-conductor 50-volt cables are outlined in the Society of Automotive Engineers, Inc. Standard for Battery
Cable (SAE J1127), Low-Tension Primary Cable (SAE J1128), and Recommended Practice for Marine-Engine Wiring
(SAE J378). The cables covered in the Standard are in compliance with the American Boat and Yacht Council (ABYC) Standard for Direct-Current (D-C) Electrical
Systems on Boats (ANSI/ABYC E-9-1993). The marking and optional jacket requirements for 50-volt cables, and the complete construction, performance, and marking requirements for single- and multiple-conductor boat cables rated 600 volts are stated in these requirements. 1.3 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"