The rule reads follows:
Accessible conductive parts shall not hazardous either
- under normal conditions (normal operating conditions and absence fault), or
- under single fault condition.
If sufficiently low voltage, i.g.
We can consider such case protection both
- protection under normal conditions and
- protection under single fault condition.FUNDAMENTAL RULES FOR PROTECTION AGAINST ELECTRIC SHOCK
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In conformity with the explanation given above, the fundamental rule for protection against
electric shock given international standards IEC 364-4-41 and IEC 536.e.1.
In this way can consider three types protection against electric shock. voltage that cannot dangerous case touching live parts
energized with such voltage, used, then both live parts and exposed conductive parts that may
become live case failure insulation live parts cannot dangerous. From the other point
of view, the protection against direct contact can divided into:
. Protection against direct contact
All electrical equipment shall subjected one the protective measures against direct
contact with live parts electrical equipment persons livestock.
5. means sufficiently low voltage means
of sufficiently low current), provides both protection against electric shock case touching
live parts and protection against electric shock case touching exposed conductive parts in
case fault called protection against both direct and indirect contact. Such type of
protection that, means one measure (e. For each type
there are used several terms that, principle, indicate the same:
1) protection ensured under normal conditions; the synonyms are:
protection normal service,
protection against direct contact,
basic protection;
2) protection ensured under single fault condition; the synonyms are:
protection case fault,
protection against indirect contact,
supplementary protection;
3) protection ensured under normal conditions well under single fault condition; the
synonym is:
protection against both direct and indirect contact. All basic methods this
protection prevent from contact with live parts, only the newest one, described additional
protection, based limiting current passing through the human body
