Oceanflex 25mm² 170A marine grade battery cable with tinned copper conductors and yellow PVC insulation. The tinned copper resists corrosion, making this particularly suitable for marine and other harsh environments.
Ensure you are ISO 13297 compliant
According to international standard ISO 13297 - Small Craft Electrical Systems - black or yellow cable can be used to signify the negative side of the circuit in any DC electrical installation. However, installers MUST use yellow cable for the negative side of a DC system if an AC electrical system is also present in the same craft. This is a safety requirement to ensure that engineers and maintenance personnel are able to clearly distinguish between the AC and DC circuits.