OBC Detection, Lighting & Power study guide
OBC Detection, Lighting & Power · Work through your exam, one topic at a time.
The Outboard Detection, Lighting & Power credential (often shortened to OBC DLP) certifies that a candidate can install, maintain, and troubleshoot the exterior electrical systems of a vessel or outboard-equipped platform: detection sensors and their coverage, lighting circuits and luminaires, power distribution and circuit protection, wiring methods and terminations, grounding and bonding, and inspection and fault diagnosis. It suits marine electricians, boatyard technicians, systems integrators, and surveyor-adjacent personnel who already have basic DC electrical knowledge and want formal recognition in the outboard/exterior systems niche. The OBC Detection, Lighting & Power study guide has 6 sections and about 1,809 words.
01Outboard Detection Systems: Sensors and Coverage
Outboard detection covers every sensor mounted outside the protected hull: intrusion beams, radar and microwave motion detectors, pressure mats, magnetic reed switches on hatches and doors, vibration and shock sensors, and thermal or infrared trip devices. Candidates must be able to distinguish detection (sensing an event) from assessment (deciding whether it is a threat) and from annunciation (signalling).
326 words, about 2 min02Outboard Lighting Circuits and Luminaire Types
Outboard lighting includes navigation lights, deck and working lights, searchlights, floodlights, and emergency or escape lighting. Candidates should recognise luminaire families (incandescent, halogen, fluorescent, LED, HID) and their electrical behaviour: inrush current, power factor, dimming compatibility, and heat output.
325 words, about 2 min03Outboard Power Distribution and Circuit Protection
This domain covers the path from source to load: main switch or isolator, distribution board, busbars, fuses and circuit breakers, residual current devices, and the discrimination between them. Candidates must understand overcurrent (overload and short circuit), earth fault protection, breaking capacity, and selectivity.
304 words, about 2 min04Wiring Methods, Conductors, and Terminations
Candidates must select conductors by current-carrying capacity, voltage drop, and environmental suitability, and choose wiring methods to match: conduit, trunking, tray, armoured cable, and flexible cord. Know the correction factors that derate a cable: ambient temperature, grouping, thermal insulation, and enclosure.
296 words, about 1 min05Grounding, Bonding, and Electrical Safety
Candidates must separate earthing (a path for fault current), bonding (equalising potential between conductive parts), and functional earthing (a reference for signalling). Know the terms: protective earth, main earthing terminal, equipotential bonding, extraneous conductive part, exposed conductive part, and touch voltage.
280 words, about 1 min06Inspection, Testing, and Fault Diagnosis
This domain joins visual inspection, dead testing, live testing, and systematic fault finding. Candidates must know the sequence: inspect before testing, test dead before live, and record results against limits.
278 words, about 1 min