Fill in the blanks with the correct answers. New requirements
for marking of cable trays apply when the cable trays installed
within substations contain conductors _________. The warning
notice shall be installed in a conspicuous position along the
cable tray at intervals not to exceed ____ ft.    1. with 600V
insulation; 20   2. cable tray rated; 50   3. rated higher than
600V; 10   4. rated higher than 35kV; 20  Answer: C  A new
section has been added to Art. 225 of the 2011 NEC. Section
225.70 outlines the warning sign requirements in substations.
The term "substation" is also a new definition in Art. 100.  As
noted in 225.70(A)(1)(c), a "DANGER — HIGH VOLTAGE" sign shall
be placed "on all cable trays containing high-voltage conductors
with the maximum spacing of warning notices not to exceed 10
ft." ANSI Z-535.2 or ANSI Z-535.4 may also provide guidelines
for the warning notice.