ISO 16315:2016

Overview

ISO 16315:2016 - Small craft - Electric propulsion system is an international standard published by ISO (developed with IEC participation) that sets safety, design and installation guidance for electrical propulsion and hybrid propulsion systems on small craft up to 24 m length of hull (LH). It covers both direct current (DC) and alternating current (AC) architectures used for propulsion or hybrid operation, including systems operating up to 1 500 V DC and up to 1 000 V AC (single- and three-phase).

Key topics and technical requirements

ISO 16315:2016 addresses system-level and component-level requirements. Major topics include:

• System architecture and components: definitions and arrangements for batteries, converters, transformers, motors and enclosures.
• Electrical ratings and segregation: permissible DC/AC voltage ranges and segregation of DC and AC circuits.
• Controls and monitoring: propulsion controls, emergency stop, “get you home” modes, fault trip/reset behavior, and operator instrumentation.
• Protection: measures against electric shock (direct contact, fault-to-earth), overcurrent protection, protective device characteristics and automatic disconnection strategies.
• Battery systems: monitoring, isolation, operational switching, ventilation and requirements for battery banks and battery packs.
• Electromagnetic compatibility (EMC): EMC considerations for propulsion electronics and variable speed drives (VFDs).
• Installation and wiring: cable segregation, enclosures, identification, hazardous area considerations and permanently energized circuits.
• Testing and verification: earthing and bonding, insulation resistance checks, on‑load testing, voltage drop and functional tests.
• Documentation: owner’s manual information and installation documentation requirements.

Practical applications and users

ISO 16315:2016 is practical for professionals involved in design, manufacture, installation and certification of electric or hybrid propulsion on small craft (≤24 m), including:

• Naval architects and marine system designers
• Boatbuilders and integrators
• Marine electricians and installers
• OEMs of batteries, converters, motors and VFDs
• Surveyors, regulators and classification bodies assessing safety and compliance

Use cases include specifying safe battery installations, selecting protection devices, designing control logic for electric propulsion, ensuring EMC compliance, and preparing commissioning and test plans.

Related standards

• ISO 10133 (DC systems, ≤50 V) and ISO 13297 (single-phase AC systems, ≤250 V) - earlier small craft electrical standards referenced by ISO 16315.
• IEC and marine electrical guidance (collaboration noted in ISO foreword) for shipboard electrical practices.

Keywords: ISO 16315:2016, electric propulsion system, small craft, AC DC, hybrid propulsion, battery monitoring, VFD, marine electrical installation, EMC, safety testing.