Mich. Admin. Code R. 408.15725 - Electrical installations
Rule 5725.
(1)
Except as required in this rule, electrical installations and equipment shall
be as prescribed in the national electrical code, NFPA 70-1981, which is
adopted herein by reference and may be inspected at the Department of Licensing
and Regulatory Affairs, MIOSHA Standards Section, 7150 Harris Drive, P.O. Box
30643, Lansing, Michigan, 48909-8143. This code may be purchased at the cost of
$27.00 from the National Fire Protection Association, Batterymarch Park, P.O.
Box 9101, Quincy, Massachusetts 02269-9101, or via the internet at web-site:
www.nfpa.org.
(2) Electrical equipment such as lighting,
power tools, and other electrical motors used in hazardous locations shall be
designed for such locations and where practicable, listed by a nationally
recognized testing laboratory. All wiring components and electrical equipment
shall be maintained in accordance with the original design. Because of exposure
to vibration and frequent rig moves, maximum use shall be made of flexible
electrical cord intended for hard usage and with inherent resistance to
dampness and petroleum products.
(3) On a land location, an engine-driven
light plant or generator shall not be located closer to the wellbore than the
nearest engine operating the rig.
(4) A light plant generator shall have a
overload safety device to provide protection from arcing in a hazardous area or
from a burnout of the generator.
(5) Rig lighting equipment, except that used
in a cellar, shall be classified as class 1, division 2.
(6) Cellar lighting equipment shall be
classified class 1, division 1.
(7)
The following area classifications shall determine the type of maintenance
requirements for electrical equipment on the rig under normal operating
conditions. When special service operations are being performed, the
requirements for electrical installations under the conditions of service
listed in subdivisions (a) to (h) of this subrule shall be followed:
(a) When the derrick or mast is not enclosed
or is equipped with a windbreak (open top and V-door) and the substructure is
open to ventilation, the areas shall be classified as shown in figure 1 and
shall provide not less than 12 complete air changes per hour.
(b) If the rig floor and substructure are
enclosed and as such, provide not less than 12 complete air changes per hour,
the areas shall be classified as shown in figure 2.
(c) Where appropriate, the area surrounding a
drilling fluid tank located outdoors shall be provided with ventilation of not
less than 12 complete air changes per hour and shall be classified as shown in
figure 3.
(d) If the drilling fluid
tank is enclosed or located so as to provide not less than 12 complete air
changes per hour, the areas shall be classified as shown in figure 4.
(e) The areas surrounding a shale shaker with
ventilation of not less than 12 complete air changes per hour shall be
classified as shown in figure 5.
(f) When the shale shaker is enclosed, the
area within the enclosure shall be classified as class 1, division 1.
(g) If an open fluid ditch or trench is used
to connect between drilling fluid tanks, or between the drilling fluid tank and
shale shaker, or open drilling fluid pits, and if ventilation of not less than
12 complete air changes per hour is provided the areas shall be classified as
shown in figure 3 for tanks.
(h)
The area surrounding the drilling fluid pump shall not be considered hazardous
unless it is so classified due to the proximity of another hazardous component
or facility.
(8) Motors
and other electrical equipment shall be classified as prescribed in figures 1
to 5 of this rule.
(9) Direct
current (DC) rotary, draw works, cathead, and pump motors in a classified area
shall have an enclosed cooling system or shall be purged with air from a safe
source. Air units supplying purged air shall be located at the input end of the
system to provide positive pressure on the ducting and motors.
(10) All electrical extension cords shall be
properly insulated with both male and female plugs, and the cord shall be in
good condition.
(11) Lamps and
reflectors shall be kept clean to provide illumination.
(12) Figures 1 to 5 read as follows:
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Notes
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