Straight voltage rated circuit breakers of the proper voltage rating (where the voltage rating is greater than the system line-line voltages) are allowed to be used on which of the following voltage systems?
1. 120V, single-phase, 2 W, solidly grounded
2. 120/240V, single-phase, 3W, solidly grounded
3. 208Y/120V, 3-phase, 4W, solidly grounded
4.240V, 3-phase, 3W, ungrounded or corner ground delta
5. 480Y/277V, 3-phase, 4W, solidly grounded
6.480V, 3-phase,3W, ungrounded or high resistance grounded
7. 600Y/347V, 3-phase, 4W, solidly grounded
8. 600V, 3-phase, 3W, Solidly grounded
a. 1 and 2
b. 2,3,4,5, and 6
c. all voltage systems apply
d. straight voltage rated circuit breakers are not to be used