在UL 758表12.1有规定.
Table 12.1
Length of lay of insulated conductors and precabled groups for cables rated greater than 30 volts
Number of insulated conductors in cable Maximum length of lay of insulated conductors and precabled groupsa
2 30 times the finished insulated conductor diameterb
3 35 times the finished insulated conductor diameterb
4 40 times the finished insulated conductor diameterb
5 or more 15 times the calculated diameter of the overall assembly. In a multiple-layer cable, the length of lay of the conductors in each of the inner layers of the cable is not specified.
NOTE – Length of lay of insulated conductors in cables rated 30 volts is not specified.
a The length of lay of each conductor in a group shall comply with the same values as those that are required for a cable. The
length of lay of each group in a cable shall comply with the same values as those that are required for a conductor.
b Conductor diameter is the measured diameter of the largest individual finished conductor in the cable
发表于 2012-2-4 11:52:49
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