ICEA P-45-482 PDF
ICEA P Short Circuit Performance of Metallic Shields and Sheaths on Insulated Cables. standard by Insulated Cable Engineers. ICEA P SHORT CIRCUIT PERFORMANCE. OF. METALLIC SHIELDS AND SHEATHS. ON. INSULATED CABLES. Approval by. AMERICAN. TEST METHOD FOR MEASUREMENT OF HOT CREEP OF POLYMERIC INSULATIONS. ICEA S ICEA S standard for power cables.
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Metallic shield – should be nonmagnetic and may consist of tape, braid, concentric serving of wires, or a sheath. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. XLPE jackets promise p-45482 benefits including:. Installing a single cable in a magnetic duct results in HIGH reactance and a de-rated ampacity. More specific information on requirements for shielding by cable type is provided in the p-45-4822 table. From the attached sketch one may calculate the resistance as following: The cable vendor, Prysmian, provided all the relevant cable data, including a shield resistance of Download Now Defense manufacturing is all about project manufacturing and project accounting.
Insulated Cable Engineers Assoc., Publication No. PRevised – Google Books
Dry soil, such as in the desert. Any input on how you calculate shield resistance would be appreciated. To reduce the hazard of shock. To obtain the voltage drop line-to-line, multiply the voltage drop by 3. Definite rules cannot be established on a practical basis for all cases. Single conductor including assemblies of single conductors a. The external field, if sufficiently intense in air, will pp-45-482 surface discharge and convert atmospheric oxygen into ozone, which may be destructive to rubber insulations and to protective jackets.
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It covers spacing encountered for conduit wiring as well as for open wire circuits. I am iea the process of calculating sequence impedances for a triplexed MCM, The effective cross-sectional area of a shield or sheath needed to withstand a given short-circuit current for a given time.
Join your peers on the Internet’s largest technical engineering professional community. The capacitance of a one conductor shielded cable is given by the following formula: XLPE jackets can allow reduced copper content and higher operating efficiencies. Three conductors in magnetic conduit will have a somewhat higher reactance than cables in non-magnetic conduit.
This diagram can be used to determine the reactance of any solid or concentric stranded conductor. Where safety to personnel is involved. If not grounded, the hazard of shock may be increased. I came up with 7. For three-phase circuits, use voltage to neutral and resistance and reactance of each conductor to neutral. Icfa metallic sheath or armor Do you have any insight on the rather large discrepancy between these resistivity assumptions?
Grounding of the Insulation Shield The insulation shield must be grounded at least at one end and preferably at two or more locations. The wire or strap used to connect the cable shield ground connection to the permanent ground must be of adequate size to carry the fault current. Importance of Shielding Where there is no metallic covering or shield over the insulation, the electric field will be partly in the insulation and partly in whatever lies between the insulation and ground.
General Calculations Excerpt from PRYSMIAN`S WIRE AND CABLE
It is accomplished by means of strand and insulation shields. All grounding connections should be made to the shield in such a way as to provide a permanent low resistance bond.
A good approximation of tape resistance is in: To limit radio interference. While resulting in slightly higher reactances than three cables in a non-magnetic duct, it is optimal relative to the alternative of a single cable in a magnetic duct.