P
43 Posts in this encyclopedia categoryPair
Two cores twisted together within a twisted pair. The indicative coupling of two parallel conductors is reduced by twisting the two cores together as short as possible. This measure is often sufficient to make the wires in question suitable for data transmission. (All information without guarantee)
Parallel wire process
Standardised measuring method for determining the transfer impedance. (All data without guarantee)
Patina
The top layer on copper surfaces develops over time from a brown layer, which essentially consists of Cu(I) oxide, through various shades of colour to the familiar typical green. Once it has taken on a green colour, it is referred to as patina. This is a complex, almost water-insoluble copper mineral. Depending on the location, the proportions of mineral-bound carbonates, hydroxides, chlorides and sulphates change and therefore also the colour of the top layer. (All data without guarantee)
PE conductor
Connection of PE conductors: The cross-section of the PE depends on the nominal cross-section of the live conductor. When connecting PE conductors, a distinction is made between direct and indirect connection via cable lugs. For direct connection, the sizes of the PE screw must be taken into account. This means that the maximum possible cross-section for M4 is 4 mm² and 6 mm² for M5. (All data without guarantee)
PE connection for connectors
For protection against electric shock. (The system manufacturer/installer is always responsible for the proper, safe functioning of the protective earth conductor in an electrical installation). (All information without guarantee)
PE sheet (or earthing plate)
Component for connecting the PE conductor and for establishing the PE connection to the housing. (All information without guarantee)
PE terminal
Terminal for protective earth conductor, earth connection (PE=Protected Earth).
PEN Ladder
Conductor that assumes the functions of neutral and protective conductor, also called neutral conductor. (All information without guarantee)
Pince à dénuder
De la pince pour retirer l'isolation des conducteurs afin de les préparer au raccordement.
Pince à dénuder
De la pince pour retirer l'isolation des conducteurs afin de les préparer au raccordement.
Plasticiser
Plasticisers are distillation products of the petroleum industry and are used to improve the processing properties of the PVC granulate, improve flowability, filler distribution, tackiness, low-temperature flexibility, flame retardancy and, last but not least, the cost of the PVC granulate by reducing the PVC powder content. Hard PVC mixtures have a plasticiser content of around 8 percent, while soft PVC mixtures have a plasticiser content of 20-50 percent. (All data without guarantee)
Plug-in connector
Connectors for the electrical connection of racks and devices with slide-in units or similar units as counterparts.
Pole, number of poles
The number of poles indicates how many electrically isolated current paths can be connected. (All data without guarantee)
Polycarbonate
The prerequisite for resistance is that no aggressive components such as plasticisers or solvents attack the polycarbonate. The material swells and this can lead to stress cracks. (All information without guarantee)
Polychloroprene (CR)
CR is a rubber vulcanisate. A rubber-like compound with good weathering and abrasion resistance, resistant to oils, moisture, light, oxygen, ozone and chemical solutions. The plastics belonging to the polyelifine group, such as ethylene, propylene and butyl polymers, are semi-crystalline thermoplastics with good chemical resistance, high toughness, elongation at break and good electrical insulating properties. (All data without guarantee)
Polyethylene
Polyethylene is a halogen-free plastic, but it burns easily. PE can be trimmed to be flame-retardant and low-smoke by adding additives. (All information without guarantee)
Polypropylene (PP)
Polypropylene is a semi-crystalline thermoplastic. It has a higher rigidity, hardness and strength than polyethylene, but these are lower than those of other plastics such as polyamide. Like polyethylene, polypropylene belongs to the group of polyolefins. The material has a high inherent attenuation. It is used as an insulating material in cabling, in power capacitors and in loudspeaker membranes. (All data without guarantee)
Polystyrene
Polystyrene are thermoplastics that are known in the cable industry as Styroflex films or threads (Styroflex cables). They are used as impact-resistant, highly flexible but tear-resistant films of e.g. 0.02-0.2 mm thickness. (All data without guarantee)
Polyurethane (PUR)
Thermoplastic polyurethanes are similar to polyamides in terms of their properties. In contrast to these, they hardly absorb any water, have excellent mechanical properties, are impact-resistant, notch-resistant, highly flexible at low temperatures and have good resistance to abrasion. (All data without guarantee)
Polyvinyl Chloride (PVC)
Polyvinyl chloride is a thermoplastic produced for the cable industry using the suspension polymerisation process. It is an odourless, free-flowing, white powder. It is electrolyte-free and therefore has very good dielectric properties. (All data without guarantee)
Potential energy
Potential energy is the work that has to be done to move a body from its reference position to another position. For example, potential energy is stored when an electric charge is moved along a field line and the voltage is increased. (All data without guarantee)
Potential equalisation
Equipotential bonding refers to an electrically conductive connection that minimises different electrical potentials. Potential equalisation is often colloquially referred to as earthing. The requirement for potential equalisation results from the "Requirements for protection against electric shock" and is defined internationally in IEC 60364-4-41:2005 and for Germany in DIN VDE 0100-410:2007-06. (All information without guarantee)
Power lines
A power cable consists of one or more conductors insulated from each other with protection against interference with the electrical function. They are not suitable for laying in earth, cable trenches or water. Power cables are suitable for fixed and mobile installation. (All information without guarantee)
Power loss
The power converted into heat or other lost energy. (All data without guarantee)
Pre-assembly
Connecting the wires before fitting the connectors. (All information without guarantee)
Prefabricated wires
A ready-to-install set of wires. It is cut to the appropriate length and fitted with connection elements at the ends.
Pressure tightness
IP 68: Complete protection against contact and ingress of dust. Protection against pressurised water for an indefinite period. (All data without guarantee)
Primary cabling
The primary cabling is cabling in the LAN area. It supplies the secondary cabling of several buildings. (All information without guarantee)
Printed circuit board
Carrier plate for electronic components with contact tracks for interconnection. They can carry conductive patterns on one or both sides. Up to multilayer PCBs. Or metallised holes for solder connections for pressing in pins etc.
Printing - cable sheaths and wires
Printing on cables and cable sheaths provides the customer with information about the design structure, test and operational markings, identification colours, customer-specific markings and manufacturer markings. The prints are created using laser and inkjet printers or printing wheels, but they are inferior in quality to embossed characters as they can be rubbed off or wiped off relatively quickly. (All information without guarantee)
Propagation speed
The transmission speed of electrical energy in a length of cable, compared to the speed of light in free space. Normally expressed as a percentage. The propagation speed is influenced by the twisting of the centre conductor and the braiding of the outer conductor. (All data without guarantee)
Protective conductor
(symbol PE) A conductor that is required for some protective measures against dangerous body currents in order to establish the electrical connection to downstream parts. The labelling of the PE conductor in wires is green/yellow (GNYE). (All information without guarantee)