Page 242 - Safety Memo

b. Install barriers to prevent employees not working on 11. The disconnection and discharging of capacitors. 2940.17
the equipment from contacting exposed live parts when 12. Ensure that employees do not open the secondary of a
there is temporary removal of guards. 2340.17(e) current transformer while the transformer is energized. If it
c. Protection from flames and electric arcs during cannot be de-energized, then the circuit must be bridged
construction, operation, and maintenance of electric so that the current transformer secondary does not
power generation, control, transformation, experience an open-circuit condition. 2940.18
transmission, and distribution lines and equipment, 13. Series street lighting work. 2940.19
including related equipment for the purpose of
communication or metering that are only accessible to 14. Work on or in proximity to overhead lines. 2941
qualified employees. 2320.11
15. Work on or in proximity to underground cables,
5. Making connections. 2320.2(b) conductors, or equipment. 2943
6. Minimum approach distance. 2320.2(d) 16. Work on or in proximity to conductors and equipment
located in stations or switchyards. 2944
7. Fall Protection. 2320.8
17. Work in power generation plants 2944.1.
C. General requirements for high voltage systems (>600 V). 2940
18. Access and workspace requirements. 2945
1. Voltage determination. 2940.1
19. Live line tools. Appendix B
2. Minimum approach distances. 2940.2
20. Protection from hazardous differences in electrical
a. Article 36 Appendix A - working on exposed energized potential. Appendix E
parts
21. Line clearance (tree trimming) operations. 2951
3. Tools and protective equipment. 2940.6
D. Main service equipment
a. Article 36 Appendix C – protective equipment
Whenever the electric utility provides service via overhead
4. Mechanical equipment. 2940.7 lines, the installation must:
5. Protection from flames and electric arcs during 1. Consist of an acceptable service pole. 2405.3
construction, operation, and maintenance of electric power
generation, control, transformation, transmission, and 2. Be suitably grounded. 2395.5(b)
distribution lines and equipment, including related 3. Provide suitable overcurrent protection. 2390.1
equipment for the purpose of communication or metering
that are only accessible to qualified employees. 2940.11 E. Wiring methods and devices
a. Article 36 Appendix D – protection from flames and 1. Flexible cords may be used in place of permanent wiring
electric arcs methods for temporary work if the cords are equipped
with an attachment plug and energized from an approved
6. Making connections. 2940.12 receptacle. 2500.7(a), (b)
7. Hazardous energy control procedures. 2940.13 2. Flexible cords must be Type S and cannot be spliced
8. De-energizing lines and equipment for employee unless they are size No. 12 (or larger). 2500.9(a)
protection. 2940.14 3. Skirted attachment plugs must be used on all equipment
9. Grounding for the protection of employees. 2940.15 operating at more than 300 V. 2510.7(b)
10. Safe work practices for high-voltage/power testing Exception: Plugs or connectors so designed that the arc
performed in laboratories, shops, substations and in the will be confined within the body or case of the device
field, and on electric transmission and distribution lines and shall be acceptable.
equipment. 2940.16 F. Grounding
1. Each receptacle must have a grounding contact that

42 Cal/OSHA Pocket Guide for the Construction Industry June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 43