Cable Terminology

Rated Voltage (Operating Voltage)

The maximum voltage (DC or AC – according to the specified values) that may be applied between the centre conductor(s) and

  • the environment for unshielded cable or
  • the shield for shielded or X-Ray cable or
  • the inner shield for triaxial cable or
  • the chassis part for single pole connectors (only when plug and receptacle are mated).

For X-Ray, triaxial and multiconductor cable additional relations may apply for the additional conductors.
In case of applied AC voltage the term AC refers to sinusoidal RMS voltage at 50/60Hz. AC voltages of higher frequency or pulsed voltages must be examined individually. Cables without AC voltage specification must not be operated with AC voltage applied.
Operation of unshielded cables at AC voltages requires careful tests and long term qualification for the specific application. Suitable means regarding partial discharge have to be considered. All AC ratings for unshielded cables are given for orientation only.
In case of UL recognized AWM please notice the following advice: Normally the cable has been spark tested according to UL758 during production. It is recommended to derate the operating voltage for continuous operation. The user has to ensure by adequate tests that the cable is suitable for his application.

(Routine) Test Voltage

The voltage applied to the cable during production to test the dielectric strength on the insulation. The duration of the test and further information are given as appropriate. The cable must not be operated at test voltage levels.

Type (Model)

Identifier for a specific product. May be extended by optional parameters to form a complete part number.

Conductor

Size:    Conductor cross-sectional area, given in AWG or mm².
Area:Conductor cross-sectional area, given in mm².
Diameter:Approximate diameter of the bare conductor.
Strands:Conductor construction, given in number of strands and area of single strand wire.
Resistance:Maximal conductor resistance per given length.
Weight:Weight of the bare conductor per given length.
Material:Normally copper (Cu).
Plating:Surface treatment (bare / none, tin plated, silver plated) shown with the conductor material (e.g. Cu/Sn: tin plated copper conductor).

No. of Conductors

Effective number of individual, insulated conductors in a multiconductor or X-Ray / E-Beam cable. Multiple bare conductors in X-Ray / E-Beam cables are counted as one conductor.

Dielectric

A non-conducting, insulating material with a specific dielectric constant. Used to insulate the high voltage carrying conductor from the environment or the shield.

Dielectric (Material)

Specifies the type of compound used for the dielectric. Typical dielectric materials are:

  • EPR: Ethylene Propylene Copolymer Rubber
  • EPDM: Ethylene Propylene Diene Monomer Rubber
  • FEP: Fluorinated Ethylene Propylene
  • LDHMW PE: Low Density High Molecular Weight Polyethylene
  • PE: Polyethylene
  • PEEK: Polyether Ether Ketone
  • PTFE: Polytetrafluoroethylene (Teflon®)
  • SILICONE: Silicone Rubber
  • XLPE / PE-X: Cross-Linked Polyethylene

Semicon

A semi-conducting material that has a specific resistance characteristic. When bonded to the dielectric of a cable, the electrical field will be flattened reducing the field strength and the voltage stress to the dielectric. Furthermore, voids between metallic conductors and the dielectric will be avoided, thus reducing partial discharge or internal corona. Semicon is used for both the inner conductor shielding and between the dielectric insulation and metallic shield.

Capacitance

Electrical capacitance of a shielded cable measured between conductor and shield per given length.

Impedance

Characteristic impedance of a shielded cable. Not to be confused with conductor resistance.

Shield (Braid)

A conducting layer or sheath of material applied around an insulated conductor or conductors. Typical shields in high voltage cables are constructed of copper braid. The purpose of the shield is:

  • Protection in case of breakdown of the high voltage insulation,
  • electrostatic shielding of the enclosed conductors,
  • return path for the operating current.
Construction:    Plating and AWG or metric size of the individual strand in the braid.
Area equivalent:    The conductor size equivalent of the complete braid.
Coverage (%):The physical area of the shield layer covered by the shielding material.

Jacket (Material)

An outer sheath or protective covering over a conductor or insulation, mainly used for protection against the environment, but may also be used to provide additional insulation. Typical jacket materials are:

  • NEOPRENE: Polychloroprene Rubber
  • PU: Polyurethane
  • PUR: Polyurethane Rubber
  • PVC: Polyvinyl Chloride
  • SILICONE: Silicone Rubber
  • TPE-U: Thermoplastic Elastomeres, Urethane Based
  • TPR: thermoplastic Rubber

Outer Diameter (DIA)

Nominal diameter of the finished cable.

Weight / Total Weight

Weight of the finished cable per given length.

Cu-Weight / Copper Weight

Weight of the copper content of the cable per given length.

Color

Color of the finished cable.

Min. Bend Radius

Minimum admissible radius when bending the cable. Normally shown for static / fixed bending. Additional information for dynamic / moving bending given for some cables.

Temperatures

Operating Temperature.:    The maximum continuous operating temperature of the finished cable. Depends on the ambient temperature and the actual operating current.
Max. Conductor Temp.:The maximum continuous temperature of the conductor during operation. Depending on the dielectric material used this limit temperature can be higher than maximum operating temperature of the cable.
Storage Temperature:The maximum continuous temperature when the cable is not under operation.

RoHS Compliant

Yes:     The cable complies to the EU Directive 2002/95/EC (Directive on the restriction of the use of certain hazardous substances in electrical and electronic equipment).
No: The cable may contain amounts of substances that exeed the limits of the EU Directive 2002/95/EC.

Halogen-free

Yes:    No halogenes (Fluorine, Chlorine, Bromine, Iodine, Astatine) are intentionally present in the cable.
No:Halogenes (Fluorine, Chlorine, Bromine, Iodine, Astatine) may intentionally be present in the cable.

Oil Resistance

If applicable, the finished cable is oil resistant according to the listed standards.

Status

P:    Preferred – Normally in stock and fast delivery.
Y: Preliminary – In development. Electrical, mechanical and environmental data are subject to change during the final design of the cable. A final specification will be determined at time of ordering.
S:Special – Available on request. Longer delivery time and large Minimum Order Quantities may apply.
E:Prospective – Not yet in development. Subject to change.
X:Example – Rough draft. No specific realization yet.
O:Obsolete – No longer available.

Color Code

 0:   black
 1:brown
 2:red
 3:orange
 4:yellow
 5:green
 6:blue
 7:violet
 8:grey
 9:white
10:natural