This British Standard specifies performance and mechanical
requirements for clamps used to provide mechanically and electrically
sound means of earthing and/or bonding, which are primarily intended
for use in electrical installations for the connection of:
a) earthing conductors, having a cross-sectional area in the range
2.5 mm2 to 70mm2, to earth electrode rods or other means of
earthing;
b) bonding conductors to metal tubes of circular cross-section that
have circumferences of not less than 18.8 mm (i.e. diameters of
not less than 6 mm).
NOTE 1 These clamps are also suitable for electrically bonding other
conductive parts, where at least one is a tube of circular cross-section.
Such clamps are not intended for connection to the armour or sheath of
a cable.
NOTE 2 Clamps specified in this standard are intended to be used singly.
NOTE 3 There is no correlation between the size of the conductor which
the clamp conductor can accommodate and the size of tube to which it is
intended to be fitted.