ICEA P-45-482:2013

$26.00

Short Circuit Performance of Metallic Shields and Sheaths on Insulated Cable

Published By	Publication Date	Number of Pages
ICEA	2013	15

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Category: ICEA

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Description

Equations and parameters have been established for short circuit
calculations for sheaths or shields made of aluminum, bronze,
copper, lead, steel, zinc and cupro-nickel alloys. The types of
sheaths or shields included are:

• Wires, applied ether helically, as braid or serving; or
longitudinally with corrugations.

• Helically applied flat tape, not overlapped.

• Helically applied, overlapped, flat tape.

• Corrugated tape, longitudinally applied.

• Tubular sheath.

The types of cable materials in contact with the sheath or
shield are: crosslinked (thermoset), thermoplastic, impregnated
paper, and varnished cloth.

The materials which determine the maximum allowable short
circuit temperatures are: paper, varnished cloth and several
thermoplastic and thermosetting materials presently appearing in
ICEA standards. Temperature limits, considered safe, were
established for the various coverings and insulation materials.

The equations may be used to determine:

• The maximum short circuit current permitted for a specific
sheath/shield and short circuit duration.

• The sheath/shield size necessary to carry a specific short
circuit current for a given duration.

• The maximum duration a specific sheath/shield can carry a
specific short circuit current.

Additional information