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