Fridgewatch 2000 Controller Mk5
Section 3 Publication 3-59
Issue 3.2 : 05.23 Page 4 of 222
Electrical
Electrical wiring, panel earthing and bonding must be sized and installed
to such a standard as to meet the requirements of the national or local
codes pertaining to the area in which the installation is taking place.
Electrical Requirements
• Main Isolator contacts rated for 25A.
• Connections to main isolator and PE stud ,maximum cross
sectional area of supply cables:
• Isolator = 10mm
2
;
• PE stud = M6.
Electrical Isolation
The electrical power used in this equipment is at a voltage high enough to
endanger life.
WARNING
Disconnect the power source before servicing or
repairing electrical equipment.
Where there is no local means of isolation or where there is a risk of
reinstatement of the supply, the circuit or equipment to be worked on
must be securely isolated by one of the following methods:
• Isolation using a main switch;
• Distribution board switch (MCB);
• Removal of Cartridge fuses.
Isolation of equipment or circuits using the main switch or distribution
board switch is the preferred method. The point of isolation must be
locked off using a unique key or combination retained by the person
carrying out the work or the appointed person, and a caution notice
attached to the point of isolation.
Where more than one operative is working on circuits supplied from an
isolated distribution board, a multi-lock hasp can be used to prevent
operation of the main isolator until such time that all persons working on
the installation have completed their work and removed their padlocks
from the hasp. If locking-off facilities are not provided on the relevant
switch, then a locked distribution board, which prevents access to the
switch is acceptable provided the key or combination is unique and is
retained by the person doing the work or the appointed person
inadvertent reinstatement of the supply.
Functional Testing
If the supply must remain connected to permit functional testing, fault
diagnosis and repair must only be undertaken by persons who are aware
of the hazard and who have taken adequate precautions to avoid direct
contact with dangerous voltages.
Electrical Hazard in the Event of Fire
If electrical equipment overheats or a fault occurs, it must be
disconnected from the supply and allowed to cool. Overheating may
damage the insulation system, cables, mouldings, gaskets and seals.
The materials used in these components may contain complex organic
compounds, which, when degraded by heat or electrical action, produce
chemical compounds in gaseous, liquid or solid forms. Many of these
gaseous and liquid product compounds are highly flammable and toxic.
If it is necessary to extinguish a fire in electrical equipment, follow the
advice given in the Fire Precautions Act 1971, ‘Guide to Fire Precautions
in Existing Places of Work that require a Fire Certificate’ available from
HMSO. Do not approach the equipment until the fire has been
extinguished and the equipment is cool.
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