IEC 60999-1:1999 pdf download.Connecting devices – Electrical copper conductors – Safety requirements for screw-type and screwless-type clamping units
1 Scope
This part of IEC 60999 applies to screw-type and screwless-type clamping units for connecting
devices, either as separate entities or as integral parts of equipment, for the connection of
electrical copper conductors (complying with IEC 60228), rigid (solid or stranded) and/or
flexible, having a cross-sectional area of 0,2 mm ² up to and including 35 mm ² and equivalent
AWG sizes with a rated voltage not exceeding 1 000 V a.c. with a frequency up to and including
1 000 Hz, and 1 500 V d.c.
It applies to clamping units primarily suitable for connecting unprepared conductors.
This standard does not apply to clamping units
a) for connection by crimping or soldering;
b) for data and signalling circuits;
c) for flat quick-connect terminations, insulation-piercing connecting devices and twist-on
connecting devices, which are covered by IEC 61 21 0 [3] 1 ) , IEC 60998-2-3 [1 ] and
IEC 60998-2-4 [2] respectively.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60999. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 60999 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60228:1 978, Conductors of insulated cables
IEC 60228A:1 982, Conductors of insulated cables – First supplement
IEC 60344:1 980, Guide to the calculation of resistance of plain and coated copper conductors of low-frequency cables and wires
IEC 61 545:1 996, Connecting devices – Devices for the connection of aluminium conductors in clamping units of any material and copper conductors in aluminium bodied clamping units
3 Definitions
For the purpose of this part of IEC 60999, the following definitions apply.
3.1 clamping unit
the part(s) of the terminal necessary for the mechanical clamping and the electrical connection
of the conductor(s), including the parts which are necessary to ensure the correct contact
pressure
3.2 terminal
the conductive part of one pole, composed of one or more clamping unit(s) and insulation if
necessary
3.3 connecting device
a device for the electrical connection of one (or more) conductor(s), comprising one (or more)
terminal(s), either fixed to a base or forming an integral part of the equipment
3.4 screw-type clamping unit
a clamping unit for the connection and subsequent disconnection of one conductor or the
interconnection and subsequent disconnection of two or more conductors, the connection being
made, directly or indirectly, by means of screws or nuts of any kind
3.5 pillar clamping unit
a screw-type clamping unit in which the conductor is inserted into a hole or cavity, where it is
clamped under the shank of a screw or screws. The clamping pressure may be applied directly
by the shank of the screw or through an intermediate part to which pressure is applied by the
shank of the screw
NOTE Examples of pillar clamping units are shown in figure 2.
3.6 screw clamping unit
a screw-type clamping unit in which the conductor is clamped under the head of a screw. The
clamping pressure may be applied directly by the head of the screw or through an intermediate
part such as a washer, clamping plate or anti-spread device
NOTE Examples of screw clamping units are shown in figure 3.
3.7 stud clamping unit
a screw-type clamping unit in which the conductor is clamped under a nut. The clamping
pressure may be applied directly by a suitably shaped nut or through an intermediate part such
as a washer, clamping plate or anti-spread device
NOTE Examples of stud clamping units are shown in figure 3.
3.8 saddle clamping unit
a screw-type clamping unit in which the conductor is clamped under a saddle by means of two
or more screws or nuts
NOTE Examples of saddle clamping units are shown in figure 4.
3.9 mantle clamping unit
a screw-type clamping unit in which the conductor is clamped against the base of a slot in a
threaded stud by means of a nut, by a suitably shaped washer under the nut, by a central peg if
the nut is a cap nut, or by an equally effective means for transmitting the pressure from the nut
to the conductor within the slot
NOTE Examples of mantle clamping units are shown in figure 5.
IEC 60999-1:1999 pdf download
