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Electric Power >> Generation vs. Transmission/Distribution
Generation vs. Transmission/Distribution 
The "269" standard does not define generation,
transmission, and distribution, since generally the same rules apply to all of
these systems. The most pronounced difference between generation versus
transmission and distribution facilities in the "269" standard are the two
separate sets of hazardous energy control or lockout/tagout requirements—one for
generation and one for transmission and distribution. Because of these
differences, OSHA's Compliance Directive for 1910.269 (CPL 02-01-038, Appendix
B, Item 2) provides guidance and flexibility for deciding where generation
stops and transmission/distribution begins. As discussed in this compliance
directive:
- A dividing point must be established between generation versus
transmission/distribution.
- The dividing point must be consistently applied throughout a facility.
- Workers must be trained on the precautions they need to use on either side
of the dividing point.
At most facilities, the dividing point between generation and
transmission/distribution is usually the disconnect on the output side of the
generator's step-up transformer (i.e., the high-side disconnect of the unit
transformer).
Generation
The general requirements of the "269" standard apply to generation. 1910.269(v)
includes specific additional requirements for generating facilities, some of
which apply to specific operations and equipment used to generate the
electricity. Some of the main generation requirements in 1910.269(v) include:
- Interlocks and other safety devices must be maintained in a safe, operable
condition (29 CFR 1910.269(v)(1)(i)).
- Generator or exciter brushes may not be changed while the generator is running
if a ground condition exists (29 CFR 1910.269(v)(2)).
- Access to areas containing exposed electrical equipment must be enclosed,
posted with warning signs, and locked (if not continuously attended) to prevent
access by 269-unqualified employees (29 CFR 1910.269(v)(4)(ii), (iii), and (iv)).
- Sufficient access and working space must be maintained around all electrical
equipment (29 CFR 1910.269(v)(3)).
- Uninsulated live parts operating at more than 150 volts to ground that are not
located so as to provide safe clearance from accidental contact must be guarded
(29 CFR 1910.269(v)(5)(i)).
Transmission vs. Distribution
Substations
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