TM0064
Page 74 of 91
Issue 2.01
Cable Routing :-
The internal cables must be kept to the absolute minimum length from the cable
gland to the terminating position within the enclosure. Special attention should be
made not to cross over other cables where possible as this may generate
interference/electrical noise.
Mains Supply :-
The supply cable must take the shortest route possible from entering the enclosure to
the supply terminals. This cable must have an air gap of 50mm minimum maintained
between it and any other conductor. The main electrical earth must be connected
directly to the main earth bonding point on the equipment.
4.3
STATIC SENSITIVE DEVICES
A static sensitive device is any semi-conductor device which may be permanently damaged
due to electrostatic potentials that are generally encountered during routine handling, repair
and transportation.
Static electricity is produced almost every time plastics or textiles are "stroked" or separated.
Static charges are collected on adjacent conductors and delivered in the form of sparks
passing between the conductors through insulating space or material. The sweat layer on the
human skin is a sufficient medium to store induced static charges and deliver them to any
receptive conductor such as an electronic component or printed circuit board (PCB).
Static discharges can be reduced by adhering to the following guide lines:
1.
Always use conductive or anti-static containers for transportation and storage.
2.
Wear an earthed wrist strap whilst handling devices and ensure a good earth is
maintained throughout.
3.
Never subject a static sensitive device to sliding movement over a non-earthed surface
and avoid any direct contact with the pins or connections.
4.
Avoid placing sensitive devices onto plastic or vinyl surfaces.
5.
Minimise the handling of sensitive devices and PCBs.
All static sensitive devices are marked accordingly but it is good engineering practice to treat
all components and PCBs with the same degree of protection.
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