CONSTRUCTION ELECTRICAL INSTALLATION AND EQUIPMENT 63
6.c.) likely applied, well overvoltages likely occur.: phase conductors,
− neutral conductors,
− protective conductor;
− for d.m. Every
electrical equipment and device connected the supply shall comply with following
characteristics:
Nature current available supply: a.5 Characteristics
Every item electrical equipment selected shall have suitable characteristics appropriate to
the values and conditions which the design the electrical installation based.c.: conductors equivalent those listed above.s.m.c. value for a. the current, which the equipment has carry normal
service.
Current: All electrical equipment shall selected with respect the maximum steady current
(r.c.
Power: All electrical equipment selected the basis its power characteristics shall be
suitable for the duty demanded the equipment, taking into account the load factor
and the normal service conditions.
Voltage: Electrical equipment shall suitable with respect the maximum steady voltage
(r. the operating time protective
devices any) during which may expected flow.4.
.
For certain equipment, may necessary take account the lowest voltage likely
to occur.
Devices are allowed loaded according their ratings. values for a.s.
Values and tolerances:
− voltage and voltage tolerances,
− frequency and frequency tolerances,
− maximum current allowable,
− prospective short-circuit current. Above that the equipment shall selected with respect the current likely to
be carried abnormal conditions and the period (e.
Frequency: frequency has influence the characteristics electrical equipment, the rated
frequency the equipment shall correspond the frequency likely occur the
circuit.c.).
Nature and number conductors:
− for a.c and/or d.g.
Protective equipment: When there any danger changing characteristics supply, the
protective equipment preventing from the consequences shall used
