Page 243 - Safety Memo

is connected to an equipment-grounding conductor. 3. Before equipment is used after an incident that
2510.7(a) may have caused damage.
2. Temporary wiring must be grounded. 2405.2(g) 4. At intervals not to exceed three months.
3. Electrically powered tools and electrical equipment with f. The employer shall not make available or permit the
exposed, non-current-carrying metal parts must be use of equipment that has not met the requirements of
grounded. 2395.45(b) 2405.4(d).
Exception: Double insulated powered tools need not be g. A means of identifying tested equipment shall be
grounded. 2395.45(b) provided.
4. The frame of a portable generator and the frame of a H. High-voltage power lines (> 600 V)
vehicle where the generator is located need not be 1. Great care must be taken when working or operating
grounded under certain conditions. 2395.6 equipment near overhead high-voltage power lines.
5. A system conductor shall be bonded to the generator 2. The required minimum safe distances (clearance) from
frame where the generator is a component of a separately
derived system. 2395.6(c) overhead lines energized by 600 V to 50,000 V are: 2946
a. For boom-type equipment in transit, 6 ft.
G. Ground-fault circuit interrupters (GFCIs)
b. For boom-type equipment in operation, 10 ft.
The GFCI device senses ground faults (accidental electrical
paths to ground) in circuits and immediately cuts off all c. For people working near overhead lines, 6 ft.
electrical power in that circuit. Note: See 2946 for minimum required clearances from
1. GFCIs are required on receptacles that are not connected voltages greater than 50,000 V.
to the site’s permanent wiring and that have a rating of 15 3. Amusement rides or attractions shall not be located under
or 20 amps, 120V, AC, single phase. 2405.4(c) or within 15 ft. (4.57 m) horizontally of conductors operating
2. The assured equipment grounding conductor program in excess of 600 volts. 2946(b)(2)
(AEGC program) is an approved alternative to the GFCI 4. The following activities are prohibited unless overhead
requirement if the following program elements are power lines have been de-energized and visibly grounded:
included: 2405.4(d)
a. Work over high-voltage lines. 2946(b)(1)
a. A description of the program must be written.
b. Work within required clearances. 2946(b)(2)
b. The employer shall designate one or more qualified
persons to implement the program. Note: When work is to be performed within minimum
required clearances, the operator of the high-voltage
c. Daily visual inspection of included equipment must be line must be notified by person or persons responsible
conducted. for the work before proceeding with any work, which
d. The following tests shall be performed: would impair the aforesaid clearance. 2948
1. All equipment-grounding conductors shall be I. High-voltage warning signs. 2947
tested for continuity and shall be electrically High-voltage warning signs must be posted in plain view of
continuous. equipment operators.
2. All plugs and receptacles must be tested for J. Lock-out procedures
proper attachment to the equipment grounding
conductor. Lock-out procedures must be followed during the cleaning,
repairing, servicing, or adjusting of machinery. GISO 3314, ESO
e. The tests shall be performed as follows: 2320.4(a)(2)
1. Before the first use of newly acquired equipment. K. Provide medical services and first aid as required in General
2. Before equipment is returned to service. Industry Safety Orders, section 3400. In addition, CPR and

44 Cal/OSHA Pocket Guide for the Construction Industry June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 45