M.O.B – Man OverBoard
Electrical
ACB / MCCB / VCB — Selection, Settings & Failure Modes
Why “a breaker is a breaker” is an ETO career-ending belief Introduction — protective devices are life-safety devices Breakers are often discussed as reliability equipment (“stops nuisance trips”,…
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Electrical
Busbars, Segregation & Internal Arc Behaviour
Why a switchboard is a pressure vessel in disguise Introduction — the switchboard is the ship’s electrical “engine…
Electrical
AC vs DC Systems
Why DC quietly causes the most persistent faults onboard Introduction — DC doesn’t trip the way AC does…
Electrical
230 / 400 / 440 V Shipboard Distribution Systems
Why “low voltage” is the most dangerous phrase onboard Introduction — LV hurts more people than HV Most…
Electrical
HV Interlocking Logic & Racking Operations
Why interlocks prevent fatal mistakes — until people defeat them Introduction — interlocks exist because people make predictable…
Electrical
Marine HV Switchgear
Marine HV Switchgear — Construction, Compartments & Failure Modes Introduction — HV switchgear is designed to be boring…
Electrical
Testing for Dead, Induced Voltage & Capacitive Charge
Why “isolated” is meaningless until you prove zero energy Introduction — the most dangerous voltage is the one…
Electrical
High-Voltage Permits, Interlocks & Earthing Procedures
Why HV systems forgive nothing — and why procedure is the control Introduction — HV doesn’t fail often,…
Electrical
Arc-Flash Boundaries, PPE & Live-Work Reality
Why “it’s only 440 V” keeps injuring ETOs Introduction — voltage doesn’t cause arc flash, energy does Arc-flash…
Electrical
Short-Circuit Levels & Fault Energy on Ships
Why the same spanner mistake ashore becomes an explosion at sea Introduction — fault energy is what kills…
Electrical
Shipboard Earthing Systems
Electrical
IMO & SOLAS Electrical Requirements