Electricity

Pages:163-177
17. Electricity
17.1. Definitions
Protection against dfrect contact
17.1.1. "Protection against direct contact" means all measures
designed to protect persons from hazards that arise when touching
active parts of electrical equipment.
Protection against indirect contact
17.1.2. "Protection against indirect contact" means the pro-
tection of persons from hazards that may arise from contact with
the normally dead parts of electrical equipment.
17.1.3. Remarks: A measure contributing to the protection
against indirect contact is a means designed to ensure the fulfilment
of this protective function (e.g. selection of appropriate arrange-
ment or equipment).
Safety extra-low voltage
17.1.4. "Safety extra-low voltage" means a nominal voltage
not exceeding 42 V between conductors, or, in the case of
phase circuits, not exceeding 24 V between conductors and neutral,
the no-load voltage of the circuit not exceeding 50 V and 29 V
respectively.
17.1.5. Remarks: When safety extra-low voltage is obtained
from supply mains of higher voltages it should be through a safety
transformer or a convertor with separate windings.
17.2. General provisions
17.2.1. All parts of electrical installations should be of a
standard of construction not lower from the safety point of view
than national or international standard specifications approved or
accepted by the competent authority.
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