Before working on lamps or other devices in live series circuits, employes shall bridge the device with jumpers such as series lamp cut-outs usually provided so that the circuit cannot be opened at the device and be completed through the body or arc at the point of opening and burn an employe.
34 Pa. Code § 39.444
This section cited in 34 Pa. Code § 39.441 (relating to general provisions); and 34 Pa. Code § 39.461 (relating to general requirements).