?
Tuesday, July 28, 1998
Question:
Where a ladder or ventilated trough cable tray, having a usable inside depth of 6 in. or less, contains multiconductor control and/or signal cables only, the sum of the cross-sectional areas of all cables at any cross section shall not exceed __ percent of the interior cross-sectional area of the cable tray.
a. ___ 25
b. ___ 30
c. ___ 40
d. ___ 50