Phase clamps for bare conductors of overhead lines are manufactured in multiple constructive versions adapted to work conditions.
Each type of clamp has a simple design, lightweight and easy to apply on conductors even its application is done from the ground or from height.
In order to allow easy mounting and dismounting, phase clamps for overhead lines are clamps with elastic tightening or by means of shape and weight (self-tightening), avoiding the screw tightening completely, which would require longer mounting / dismounting time and which creates difficulties in the re-connection of the stick to the clamp for the dismounting operation. If the phase clamps must be handled using a detachable insulating stick, the clamps are provided with simple and highly effective coupling systems to provide automatic disconnection of the clamp from the stick once applied on the overhead line conductor and dismounting rings to allow the hanging followed by safe detachment of the clamp from the conductor in the dismounting phase.
Phase clamps for bare conductors of overhead lines have their bodies and jaws made of aluminium alloy cast items. Some of them are provided with springs of various sizes in order to provide tightening forces adapted to short-circuiting currents which must be assured.
| Technical characteristics | Self-tightening clamp for MV overhead lines | Self-locking automatic clamp (CAA) MV overhead lines | Self-locking automatic clamp (CAA) HV overhead lines |
| Clamp type | LEA MT | CAA-LEA MT | CAA- LEA IT |
| Code | P 265-4-00C | P 2155-1-00 | P 2158-1-00 |
| Nominal short-circuit for t = 1 s Isc (kA) | 8 | 18 | 18 |
| Clamp body execution procedure | Cast body | Cast body | Cast body |
| Material | Aluminium alloy | Aluminium alloy | Aluminium alloy |
| Weight (kg) | 0.5 | 0.68 | 0.7 |
| Thickness of conductor bar where the phase clamp can be applied (mm) | - | - | - |
| Diameter of the sphere (mm) | - | - | - |
| Diameter of the conductor where the phase clamp can be applied (mm) | 4÷22 | 5÷32 / 6÷32 | 5÷32 / 6÷32 |
| Technical characteristics | Self-tightening clamp with insulating stick (new model* ) | Self-tightening clamp with insulating stick (old model** ) |
| Clamp type | - | - |
| Code | P 232-0-00-UJT | P 232-0-00 |
| Nominal short-circuit for t = 1 s Isc (kA) | 8 | 6 |
| Clamp body execution procedure | Cast body | Cast body |
| Material | Aluminium alloy | Aluminium alloy |
| Weight (kg) | 0.43 | 0.4 |
| Thickness of conductor bar where the phase clamp can be applied (mm) | - | - |
| Diameter of the sphere (mm) | - | - |
| Diameter of the conductor where the phase clamp can be applied (mm) | 5÷16 | 5÷16 |
* component of universal short-circuiting devices for LV overhead lines
** component of short-circuiting devices for LV overhead lines with bare conductors
There are three types of phase clamps for bare conductors of LV / MV / HV overhead lines :
- Self-tightening clamp for MV overhead lines;
- Self-locking automatic clamp (CAA) MV overhead lines;
- Self-locking automatic clamp (CAA) HV overhead lines.
