High-Voltage Permits, Interlocks & Earthing Procedures
Why HV systems forgive nothing — and why procedure is the control Introduction — HV doesn’t fail often, but when it does it ends careers High-voltage systems (typically 3.3–11 kV AC onboard) are designed to be robust and rarely operated. That reliability creates a dangerous illusion: because HV equipment “never causes trouble,” crews assume it […]
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 injuries are not caused by high voltage.They are caused by high fault current and slow clearing times. Ships combine: This makes even LV systems extremely dangerous. What arc-flash actually is An arc fault: In a ship’s switchboard […]
Short-Circuit Levels & Fault Energy on Ships
Why the same spanner mistake ashore becomes an explosion at sea Introduction — fault energy is what kills and burns, not voltage Most people fear voltage because it’s easy to picture. But in switchboards, the severity of an event is driven by available fault current and fault clearing time — the energy that turns copper […]
Shipboard Earthing Systems
Why earthing on ships is designed for continuity — and why it becomes deadly when misunderstood Introduction — ships don’t earth systems the way shore plants do A lot of shore electricians arrive onboard expecting one comforting rule: earth faults trip the breaker. On many ships that’s not what you want — and not what […]
IMO & SOLAS Electrical Requirements
What Port State Control actually enforces Introduction – SOLAS is not abstract law SOLAS electrical rules are often treated as “design-stage requirements”. In reality, Port State Control enforces them operationally, years after delivery. When PSC inspects electrical systems, they are not checking theory. They are checking: If power fails when it shouldn’t, SOLAS has already […]
IEEE vs IEC — What Ships Actually Use (and Why It Matters)
Why mixing standards blindly causes design errors, blackouts, and detentions Introduction – Two standards, one ship, zero margin for confusion Many ETOs arrive onboard with strong IEEE or shore-based electrical backgrounds. Others were trained under IEC-centric maritime systems. The mistake is assuming these frameworks are interchangeable. They are not. On ships, IEC governs legality, IEEE […]
Power Factor on Ships
Why poor power factor causes blackouts before alarms Introduction – Power factor is invisible until it hurts you Power factor is one of the most misunderstood concepts on ships because nothing visibly “breaks” when it is bad. Lights stay on. Motors run. Generators appear healthy. Meanwhile: By the time alarms appear, you have already lost […]
IEC Marine Electrical Standards (IEC 60092 Explained)
Why ships have their own electrical rulebook Introduction – IEC 60092 exists because ships kept burning Marine electrical systems are not governed by general industrial rules for one simple reason: industrial rules failed at sea. Before IEC 60092, ships were fitted with electrical systems adapted from shore installations. Fires, blackouts, electrocutions, and propulsion losses followed […]