Equations have been established for short circuit calculations
\nfor conductors made of copper or aluminum. The coverings and
\ninsulations, which determine the maximum allowable short circuit
\ntemperatures, are paper, varnished cloth and several thermoplastic
\nand thermosetting materials presently appearing in ICEA standards.
\nTemperature limits, considered safe, were established for the
\nvarious covering and insulation materials. <\/p>\n
The equations may be used to determine: <\/p>\n
\u2022 The maximum short circuit permitted for a specific conductor
\nand short circuit duration. <\/p>\n
\u2022 The conductor size necessary to carry a specific short circuit
\ncurrent for a given duration. <\/p>\n
\u2022 The maximum duration a specific conductor can carry a specific
\nshort circuit current. <\/p>\n
A formula has been established for short circuit calculations
\nwith conductors of copper or aluminum. The insulations, which
\ndetermine the maximum allowed short circuit temperatures, are
\ndescribed in the ICEA Standards. The formula is based on the heat
\ncontent of the conductor material and the temperature limit of the
\ninsulation with the assumption that the time interval is so short
\nthat the heat developed during the short circuit is contained in
\nthe conductor. At the time this document was originally published
\nthere was no standard mathematical method available to calculate
\nheat flow from the conductor through the insulation at the
\ncessation of the short circuit load. It was necessary to enlist the
\naid and facilities of member laboratories and Massachusetts
\nInstitute of Technology to obtain in cooperation a solution to this
\nproblem so that safe temperature limits could be established for
\nthe various types of insulations. The solution is still a viable,
\nconservative approach to the calculation of short circuit
\ncapacity. <\/p>\n
Results are sufficiently conservative to neglect conductor
\nskin-effect except for very large conductors. Skin-effect can be
\ntaken into account by dividing the right-hand member of the
\nequations shown by the appropriate conductor ac\/dc resistance
\nratio.<\/p>\n","protected":false},"excerpt":{"rendered":"
Short Circuit Characteristics of Insulated Cable<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ICEA<\/b><\/a><\/td>\n 2007<\/td>\n 22<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":561271,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2683],"product_tag":[],"class_list":{"0":"post-561262","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-icea","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/561262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/561271"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=561262"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=561262"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=561262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}