Series lamp circuits should not be tested at their full operating voltage unless it is impracticable to test otherwise. Tests should be made only in accordance with a time schedule, concerning which persons whose safety may be affected are informed.
34 Pa. Code § 39.445
This section cited in 34 Pa. Code § 39.441 (relating to general provisions); and 34 Pa. Code § 39.461 (relating to general requirements).