Syllabus: Classroom (4-hours)
(1) Electrical supplies Types of supply… AC: shore power, stand-alone AC generators, inverters. DC: engine alternators, batteries, photovoltaic supplies and wind turbines.
(2) Electrical safety Mains supplies – 230v AC. Approved leads, plugs, and sockets, RCD’s, on-board distribution units & socket outlets. Dangers: fire, smoke, burns, electrocution, lethal currents, fault currents, earthing, circuit protection & cable sizing. DC supplies: 12v-24v DC, battery banks – switching/charging arrangements, regulation, photovoltaic panels, wind turbines, suitable regulation & cable sizing. Dangers: battery damage, electrolyte leakage, equipment damage, fire, smoke, burns, explosion. Battery types, usage and condition battery testing equipment.
(3) The multimeter (DMM) - how to use one Settings, limitations, interpretation of readings. Voltage measurements (AC/DC), current measurements, continuity testing (the bell test). Suitable test leads for mains voltages.
(4) Typical on-board circuits Distribution of supply & switching arrangements. Important navigation/communication equipment: VHF aerials (for AIS & VHF radio) high gain/low gain aerial issues, suitable positioning (exposure).
At the end of the course, students should be able to carry out simple electrical checks and tests to both AC & DC supplies found on-board vessels. Able to determine suitable positioning & location of Navigation equipment.
Course Title: Introduction to Small Craft Electrical Systems
Overview: The course aims to give students an appreciation and basic understanding of on-board electrical supply & distribution systems and to cover the essential elements of the important navigation equipment found on typical coastal cruisers.