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MGN 132 (M+F)

Electrical Equipment, Maintenance and Incidents

Notice to Shipowners, Masters and Ships Officers.

This M Notice supersedes M 1163

This Marine Guidance Notice is to draw attention to incidents involving electrical equipment,
maintenance responsibilities and the use of thermographic imaging as a maintenance tool.
1 . Attention is drawn to the need for all
electrical equipment used in ships to be
maintained with due considerations to the
conditions of service and in particular,
vibration and mechanical shock to which it
might be subject in normal shipboard


c. Loose parts of a switch fuse became

detached, fell onto bus-bars causing
an arc which resulted in a main
switchboard fire, complete loss of
electrical power and propulsion.
This incident involved a passenger
ship in severe weather conditions
and was potentially extremely
serious. Subsequent investigation
revealed that similar parts on a
number of other switch fuses in the
same switchboard were also loose.

A number of incidents reported to the

Agency indicate that ships and personnel
have been placed in unnecessary danger due
to connections and parts of electrical
equipment becoming loose in service. In one
such incident an electrical Officer was
injured whilst removing debris from an
overheated fuse assembly on a High Voltage
Switchboard. Overheating was the result of
a loose cable connection.



Once equipment is in service those,

responsible for its operation and
maintenance should ensure that it is
examined at regular intervals so that any
wear or other deterioration which could
eventually lead to overheating or
disintegration, is detected before any serious
consequences arise.


It is apparent from the number of reported

incidents that ships personnel have, at times,
been placed in unnecessary danger. In order
to identify potential overheating situations
in electrical equipment, owners are advised
to consider the use of thermal-imaging
techniques as a means of verifying the
security of electrical connections and pin
point problem areas at an early stage.

Incidents illustrated in previous M Notices

and in recent casualty reports highlight the
need for more reliable equipment.
Equipment often failed due to either
inadequate design, maintenance or failure
to utilise the correct equipment:

A report of a switchboard fire on an

offshore stand-by vessel referred to
many loose connections.


Loose connections on the steering

gear position transmitter of a general
cargo ship caused a failure of the
control system and loss of steering,
leading to collision with another ship.

A switchboard fire on a tanker

caused by overheating of loose
contacts on a motor starter.

Maritime and Coastguard Agency
Spring Place
105 Commercial Road
Southampton S015 1EG
Tel: 01703 329117
Fax: 01703 329161
December 1999
MS 026/003/0001
An executive agency of the Department of the
Environment, Transport and the Regions

Crown Copyright 1999