IEEE P1185 DRAFT
Draft Recommended Practice for Cable Installation in Generating Stations and Industrial Facilities
|Publication Date:||1 July 2018|
This recommended practice provides guidance for wire and cable installation practices in generating stations and industrial facilities. It covers installation of cable in trays, conduit, duct banks, wire ways, gutters, and other raceway systems. It covers medium voltage power cable, low voltage power cable, control cable, instrumentation cable, coax/triax cable, fiber optic cable, data communications cable, and other specialty cables used in power plant and industrial environments. This document may also be of benefit for the proper installation of wire and cable systems in commercial, governmental, and public facilities when the same or similar wire or cable types and raceways are used.
The purpose of this recommended practice is to provide guidance for the proper installation of wire and cable in generating stations and industrial facilities on how to help prevent installation damage which is the single greatest cause of wire and cable failures. Cable failures can lead to power outages and equipment downtime, resulting in inconvenience at best, loss production, or worse a safety issue. This document provides information for engineers, technicians, and crafts people to avoid potential wire or cable damage during installation, testing, and modification of cable systems at generating stations and industrial facilities.
Units of measure
The requirement to show metric units first and if desired English units second in parentheses after the metric units is dictated by IEEE Policy 9.18, and has been implemented in this document even though the customary practice when installing American Wire Gauge (AWG) wire and cable is to use the English units. The user of this document may choose to use the English units since cables made to AWG sizes are typically installed using English units of measure, even though the metric units are shown first and English units second in parentheses. Conformance to this recommended practice can be achieved using either metric or English units provided the user is consistent when selecting and applying the units. The user is strongly cautioned not to mix units as mixing units can and will result in installation issues. The user is encouraged to select units that are most familiar to the installers so as to reduce the potential for creating installation problems that could go undetected until wire and cable failures occur, which is often years after installation. It should also be noted that due to the reversal of the order of metric and English units, an attempt was made to keep the significant figures of the metric and English units comparable. However, due the application of rounding principles, the mathematical conversion from English to metric and metric to English may not be exact.
The user is also cautioned to recognize the difference between force and mass especially within the English system of units since term "pound" (lb.) has been often misapplied, which can result in errors in the application of the equations. Attempts have been made within this document to be clear in the terminology to avoid confusion and misapplication of this concept in both the metric and English units. It should also be noted that cable manufacturers give cable weights in SI units using "kg/m" whereas in English the information is provided in terms of "lb. /ft." The metric units are clearly mass per unit length whereas the English units are more ambiguous. In this context, cable weight in English units is lbf/ft., which is a force per unit length. For clarity equations using cable weight have often been shown as two equations, one for metric and the other for English. Since the metric equation uses cable weight in terms of mass per unit length, the acceleration due to gravity constant "g" has been added to the metric equation, which does not appear in the English equation.