Page 75 - Safety Memo

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C. Main service equipment 1. GFCIs are required on receptacles that are not connected
to the site’s permanent wiring and that have a rating of 15
Whenever the electric utility provides service via overhead or 20 amps, 120V, AC, single phase. 2405.4(c)
lines, the installation must:
2. The assured equipment grounding conductor program
1. Consist of an acceptable service pole. 2405.3
(AEGC program) is an approved alternative to the GFCI
2. Be suitably grounded. 2395.5(b) requirement if the following program elements are
included: 2405.4(d)
3. Provide suitable overcurrent protection. 2390.1
a. A description of the program must be written.
D. Wiring methods and devices
b. The employer shall designate one or more qualified
1. Flexible cords may be used in place of permanent wiring persons to implement the program.
methods for temporary work if the cords are equipped
with an attachment plug and energized from an approved c. Daily visual inspection of included equipment must be
receptacle. 2500.7(a),(b) conducted.
2. Flexible cords must be Type S and cannot be spliced d. The following tests shall be performed:
unless they are size No. 12 (or larger). 2500.9(a)
01. All equipment grounding conductors shall be
3. Skirted attachment plugs must be used on all equipment tested for continuity and shall be electrically
operating at more than 300 V. 2510.7(b) continuous.
Exception: Plugs or connectors so designed that the arc 02. All plugs and receptacles must be tested for
will be confined within the body or case of the device proper attachment to the equipment grounding
shall be acceptable. conductor.
E. Grounding e. The tests shall be performed as follows:
1. Each receptacle must have a grounding contact that 01. Before the first use of newly acquired equipment.
is connected to an equipment grounding conductor. 02. Before equipment is returned to service.
2510.7(a)
03. Before equipment is used after an incident that
2. Temporary wiring must be grounded. 2405.2(g)
may have caused damage.
3. Electrically powered tools and electrical equipment 04. At intervals not to exceed three months.
with exposed, non current-carrying metal parts must be
grounded. 2395.45(b) f. The employer shall not make available or permit the
use of equipment that has not met the requirements of
Exception: Double insulated powered tools need not be 2405.4(d).
grounded. 2395.45(b)
g. A means of identifying tested equipment shall be
4. The frame of a portable generator and the frame of a provided.
vehicle where the generator is located need not be
grounded under certain conditions. 2395.6 G. High-voltage power lines (> 600 V)
5. A system conductor shall be bonded to the generator 1. Great care must be taken when working or operating
frame where the generator is a component of a separately equipment near overhead high-voltage power lines.
derived system. 2395.6(c)
2. The required minimum safe distances (clearance) from
F. Ground-fault circuit interrupters (GFCIs) overhead lines energized by 600 V to 50,000 V are: 2946
The GFCI device senses ground faults (accidental electrical a. For boom-type equipment in transit, 6 ft.
paths to ground) in circuits and immediately cuts off all b. For boom-type equipment in operation, 10 ft.
electrical power in that circuit.

38 Cal/OSHA Pocket Guide for the Construction Industry | June 2015 Cal/OSHA Pocket Guide for the Construction Industry | June 2015 39