When the 3-phase a.c. supply voltages are connected to the three stator phase windings, the resulting phase currents produce a multi-pole magnetic flux. This flux is physically rot... Read more
The general term “overcurrent” applies to a relatively small increase over the full load current (FLC) rating (e.g. due to mechanical overloading of a motor) rather tha... Read more
If a single earth fault occurs on the live line of an earthed ship distribution system it would be equivalent to a short-circuit fault across the generator through the ship’s... Read more
The function of a ship’s electrical distribution system is to safely convey the generated electrical power to every item of consumer equipment connected to it. Probably the m... Read more
Power currents (a. c.) can be measured simply by means of a clamp meter which acts as a current transformer. The instrument tongs are clipped round a single insulated conductor... Read more
There are various types of diagram which attempt to show how an electrical Circuit operates on ship. Symbols are used to represent the various items of equipment. The shipbuilder p... Read more
Ship switches are usually very reliable electrical devices. Most switches on vessel are designed to operate 100,000 times or more without failure if the voltage and current ratings... Read more
Circuit breakers require careful inspection and cleaning at least once a year. Before working on circuit breakers, check the applicable technical manual carefully. Before working o... Read more
Embossed metal tags are used to identify cables throughout the vessel. The tags are located at the distribution panel and the component. Tags are also attached to the cables where... Read more
Color coding allows the Electrical engineer ETO to follow electrical circuits throughout a vessel without having to physically touch each cable. The color can be continuous through... Read more
