(By authority conferred on the director of the department of licensing and regulatory  
affairs by sections 16 and 21 of the Michigan occupational safety and health act, 1974 PA  
154, MCL 408.1016 and 408.1021, and Executive Reorganization Order Nos. 1996-2,  
2003-1, 2008-4, and 2011-4, MCL 445.2001, 445.2011, 445.2025, and 445.2030)  
R 408.15701 Scope.  
Rule 5701. This part pertains to the construction, operation, and maintenance  
of land-based equipment and related practices for the safety of employees as such  
equipment and practices pertain to the drilling and servicing of all of the following:  
(a) Oil and gas.  
(b) Brine.  
(c) Minerals.  
(d) Liquid disposal.  
(e) Gas storage.  
(f) Liquefied natural gas storage wells.  
(g) Auxiliary operations.  
History: 1979 AC; 1989 AACS.  
R 408.15703 Definitions; A to C.  
Rule 5703. (1) "Acidizing" means the act of pumping an acidic solution into a  
wellbore to remove any materials from the perforations, pipe, and walls of the  
producing formation and includes the act of pumping the substance into formations  
to improve permeability.  
(2) "Air, gas, or mist drilling" means a method of rotary drilling using compressed  
air or gas as its primary circulating medium.  
(3) "Anchor" means a device that is used to secure, fasten, or stabilize.  
(4) "Bleed-off line" or "blooey line" means a pipe used to discharge materials or  
release pressure away from a well or pressurized equipment.  
(5) "Blocks, crown, and traveling" means the fixed upper and movable lower  
blocks, respectively, of the block and tackle assembly on a rig that raises and lowers the  
drill string or tubing.  
(6) "Blowout" means an uncontrolled flow of gas, oil, or other well fluids.  
(7) "Blowout preventer" means a device attached to the wellhead that allows the  
well to be sealed to confine the well fluids in the wellbore.  
(8) "Casing" means the pipe installed in the wellbore.  
Page 1  
(9) "Cathead" means a rotating device mounted on the end of a shaft of the draw  
(10) "Catwalk" means an elongated platform to the side of a rig where pipe is  
laid out and lifted into the derrick. A catwalk is connected to the rig floor by a pipe  
(11) "Cellar" means an excavation around the wellhead to provide space for items  
of equipment at the top of the wellbore.  
(12) "Cementing" means the act of pumping a slurry into a wellbore to perform  
functions such as supporting and sealing casing, isolating formations behind  
casing, protecting freshwater formations, and sealing perforations in casing.  
(13) "Choke line" means an extension of pipe from the blowout preventer which  
is used to direct well fluid from the annulus to the choke manifold.  
(14) "Christmas tree" means the valves and fittings assembled at the top of a  
completed well to control the flow of hydrocarbons and other fluids.  
(15) "Crown block" means an assembly of sheaves or pulleys mounted on beams  
at the top of the derrick or mast over which a hoisting line is reeved.  
History: 1979 AC; 1989 AACS.  
R 408.15704 Definitions; D to F.  
Rule 5704. (1) "Derrick," sometimes called a mast, means a large load-  
bearing structure that supports the crown block.  
(2) "Derrick board" means the platform on which derrickmen work.  
(3) "Draw works" means the hoisting mechanism on a drilling, well servicing,  
or workover rig. It is essentially a large winch that spools off or takes in the hoisting  
(4) "Drill pipe" means a length of steel tube to which special threaded connections  
called tool joints are attached. Several lengths joined together are called a drill  
(5) "Drill stem" means the entire drilling assembly from the swivel to the bit  
composed of the kelly, drill string, subs, drill collars, and other downhole tools such  
as stabilizers and reamers.  
(6) "Drilling line," sometimes called a hoisting line, means the wire line used in  
the main rig hoisting system, one end of which is attached to the hoisting drum. This  
line does not include a tugger line.  
(7) "Drilling rig" means the equipment and machinery assembled primarily for the  
purpose of drilling or boring a hole in the ground.  
(8) "Drill stem test" means a method of gathering data on the  
productivity of a formation by permitting the flow of formation fluids through the  
drill pipe.  
(9) "Elevator" means a mechanical device attached to the traveling block that  
latches around and supports the pipe during hoisting.  
(10) "External guylines" means lines that run from some point in the derrick,  
mast, or pole to ground anchors or to a special substructure or derrick base which  
provides a substitute for ground anchors to provide stability.  
Page 2  
(11) "Flow line" means the surface pipe which carries drilling fluid from surface  
tanks or other storage.  
(12) "Freezing operation" means the creation of a plug by freezing a liquid slug  
in a pipe or fitting.  
History: 1979 AC; 1989 AACS.  
R 408.15705 Definitions; H to O.  
Rule 5705. (1) "Hot oil operations" means the treatment of a producing well  
with heated oil to melt accumulated paraffin in the tubing and annulus.  
(2) "Hydraulic fracturing" means the act of pumping fluids into a wellbore and  
into a specific formation to induce fractures.  
(3) "Kelly" means a 3 or more sided shaped steel pipe connecting the swivel to  
the drill pipe. The kelly moves through the kelly bushing and the rotary table and  
transmits torque to the drill string.  
(4) "Lubricator" sometimes called a bottle, means a special length of casing or  
tubing placed temporarily above a valve on the top of the casing or tubing head used to  
run tools or substances into a producing well without having to kill it.  
(5) "Making a connection" means the act of screwing a joint of pipe or rods onto  
the string suspended in the wellbore.  
(6) "Mud box" means a device used to wrap around pipe connections to deflect  
fluid released when a joint or stand of pipe containing liquid is unscrewed.  
(7) "Nip point" means the point where the wire line becomes tangent to a sheave.  
(8) "Oil saver" means a pressure-sealing gland arrangement which is used to prevent  
the leakage and waste of gas, oil, or water around a wire line when servicing a well. It  
may be operated by mechanical or hydraulic means.  
(9) "Open hole" means the uncased part of the wellbore.  
(10) "Outriggers" means structural extensions of the mast or pole base protruding  
at approximately 90 degrees from the longitudinal axis of the rig to provide overturn  
History: 1979 AC; 1989 AACS.  
R 408.15706 Definitions; P to R.  
Rule 5706. (1) "Perforating" means the act of making holes in pipe, cement, or  
formation at desired depths.  
(2) "Pipe racking board guylines," sometimes called tubing board guylines,  
means lines that run from racking board to ground anchors or special substructure or  
base which provides a substitute for ground anchors.  
(3) "Pipe ram" means a large valve which is usually installed above the ram  
preventers and which forms a seal in the annular space between the pipe and  
(4) "Pipe tapping," sometimes called hot tapping, means the act of drilling a  
hole in the side of pipe that is under pressure.  
Page 3  
(5) "Pole mast" means a structure which consists of 1 or more tubular sections,  
either telescoping or nontelescoping, and which is a load-bearing member. The  
structure, when erected to working position, usually requires guylines. It may be  
attached to a carrier, skid base, or substructure. It is used in place of a derrick.  
(6) "Power tongs" means pneumatically or hydraulically operated tools that  
serve to spin the pipe up tight or, in some instances, serve to apply the final makeup  
(7) "Pumping unit" means surface equipment assembled for the purpose of  
mechanically lifting fluids from a well.  
(8) "Qualified employee" means a person who, by possession of a recognized  
degree, certificate, or professional standing, or who by knowledge, training, or  
experience, has successfully demonstrated the ability to perform work relating to the  
subject matter.  
(9) "Rigging up" means the on-site erection and connection  
components in preparation for drilling or well servicing operations.  
(10) "Rod," sometimes called a sucker rod, means a special steel rod, a number of  
which are screwed together to make up the mechanical link from the surface pumping  
unit to the pump in the well.  
History: 1979 AC; 1989 AACS.  
R 408.15707 Definitions; S.  
Rule 5707. (1) "Safety valve" means a valve available for quick installation  
in the pipe string to prevent flow.  
(2) "Shale shaker" means a vibrating sieve used to remove cuttings from the  
circulating fluid.  
(3) "Snubbing" means pulling or running pipe under pressure through a resilient  
sealing element where special equipment is used to apply external force to push  
the pipe into the well or to control the pipe movement out of the well.  
(4) "Special services" means those operations requiring specialized equipment  
and personnel to perform work processes to support well drilling and servicing  
(5) "Stabbing a valve" means aligning and screwing a valve onto the end of a pipe.  
(6) "Stabbing board" means a temporary elevated platform erected in a derrick or  
(7) "Stripping" means pulling or running pipe under pressure through a resilient  
sealing element and may also include the removing of rods and tubing from the well  
at the same time.  
(8) "Substructure" means a structure that surrounds the wellbore at the surface and  
provides the working area for certain employees. It may contain the rotary table.  
(9) "Swabbing" means the planned lifting of well fluids to the surface using a  
piston-like device installed on a wire line. Swabbing may inadvertently occur due  
to piston action as pipe or assemblies are pulled from the well.  
(10) "Swivel" means a device at the top of the drill stem that permits the  
circulation of fluids and the rotation of the drill string.  
Page 4  
History: 1979 AC; 1989 AACS.  
R 408.15708 Definitions; T to W.  
Rule 5708. (1) "Tour" means the work period of a rig crew and is usually  
pronounced as if spelled "t-o-w-e-r."  
(2) "Tubing" means a small diameter pipe that is run into a well to serve as a  
conduit for the passage of oil or gas to the surface.  
(3) "Valve drilling operation" means the drilling of a hole through the blocking  
element of a valve that is stuck in the closed position with pressure on the well side  
of the valve.  
(4) "Weight indicator" means an instrument that shows the weight suspended  
from the hooks.  
(5) "Well servicing" means the remedial or maintenance work performed on an oil  
or gas well to improve or maintain the production from a formation already  
(6) "Well servicing rig" means a portable rig consisting of a hoist, engine, and a  
self-erecting mast.  
(7) "Wellbore" means the hole made by drilling or boring.  
(8) "Wire line wiper" means a device used to wipe off oil, mud, or liquid from  
a wire line as it is pulled out of the well.  
History: 1979 AC; 1989 AACS.  
R 408.15711 Employer and employee responsibilities.  
Rule 5711. (1) The employer shall do all of the following:  
(a) Provide training to an employee regarding the operating procedures, hazards,  
and safeguards of the assigned task, including the safe handling and use of hazardous  
substances and the personal protective equipment required.  
(b) Assure that the employee uses the personal protective  
prescribed in this part.  
(c) Not permit equipment to be operated that is not guarded according to state  
standards, has a defective guard, or is otherwise unsafe. A rotary table, cathead, kelly,  
and kelly bushing need not be guarded.  
(d) Assure that vehicles not involved in the immediate rig operation are parked a  
minimum distance of 100 feet from the wellbore. Equivalent safety measures shall be  
taken where terrain, location, or other conditions do not permit this spacing.  
(e) Assure that the well drilling contractor posts at all drilling sites, the  
telephone numbers, locations, and other relevant information pertaining to emergency  
personnel and facilities.  
(f) Assure that the well servicing contractor posts, at all well servicing sites,  
the telephone numbers, locations, and other relevant information pertaining to  
emergency personnel and facilities.  
(g) Not permit an employee to ride on a load being hoisted or a hoisting line.  
(2) An employee shall do all of the following:  
Page 5  
(a) Not use equipment until trained in its operating procedures, hazards, and  
safeguards and until authorized to do so.  
(b) Report to the supervisor any equipment or safeguard that is defective.  
(c) Use personal protective equipment prescribed by this part.  
(d) Replace any guard or safeguard removed for inspection, maintenance, or setup  
before operating the equipment.  
History: 1979 AC; 1989 AACS.  
R 408.15712 Personal protective equipment and methods.  
Rule 5712. (1) The requirements for the providing and use of personal protective  
equipment are found in general industry safety standard, Part 33. Personal Protective  
Equipment, being R 408.13301 et seq. of the Michigan Administrative Code.  
(2) An employee shall not wear loose or poorly fitted clothing.  
(3) An employee shall not work in clothing that is saturated with any flammable,  
hazardous, or irritating substance. This clothing shall be immediately removed and  
replaced with suitable clothing after the affected skin area has been thoroughly washed  
and treated, if necessary.  
(4) While on the worksite, an employee shall not wear jewelry or other adornments  
which are prone to snagging or hanging and causing injury.  
(5) An employee whose length of hair poses a hazard on the worksite shall keep his or  
her hair contained in a suitable manner while working. Hair and beard styles shall not  
interfere with the wearing of respiratory protective equipment.  
(6) If chemicals harmful to the eyes are being used, appropriate personal protective  
equipment and eye wash stations shall be provided to the employee, at no expense to the  
employee, and shall be used.  
History: 1979 AC; 1983 AACS; 1989 AACS; 2013 AACS.  
R 408.15713 Safety belt, lifeline, and lanyard use.  
Rule 5713. (1) An employee, when engaged in work 10 feet or more above the rig floor  
or other working surfaces, shall wear a safety belt or harness with an attached lanyard,  
except during rig up and rig down.  
(2) A safety belt, safety harness and any lifeline and lanyard shall be used only for  
safeguarding the employee.  
(3) A safety belt, safety harness, lifeline, or lanyard subjected to in-service shock  
loading, rather than static loading, shall be removed from service and shall not be used  
again for employee protection.  
(4) When working in the mast or derrick, an employee shall be provided with safety belt  
or safety harness and a lanyard or lifeline which is adjusted to allow the minimum of drop  
in case of a fall.  
History: 1979 AC; 1983 AACS; 1989 AACS; 2013 AACS.  
Page 6  
R 408.15714 Fire prevention.  
Rule 5714. (1) Smoking, open fires, or other potential sources of ignition  
shall be permitted only in designated areas located at  
safe distance from the  
wellhead or flammable liquid storage areas. Operations or areas which constitute a fire  
hazard shall be conspicuously posted with a sign, "NO SMOKING OR OPEN  
(2) Hazardous substances shall be stored in approved containers and properly  
(3) Equipment, cellars, rig floors, and ground areas adjacent to the well shall be  
kept free from oil or gas accumulations which might create or aggravate fire hazards.  
(4) Oxygen, natural gas, or liquefied petroleum gas shall not be used to operate  
spray guns or pneumatic tools.  
(5) Combustible materials, such as oily rags and waste, shall be stored in covered  
metal containers. The contents shall be disposed of daily.  
(6) Gasoline-fueled engines shall be shut down before refueling operations,  
unless the engine is needed for the control of the operation.  
History: 1979 AC.  
R 408.15715 Fire protection.  
Rule 5715. (1) Fire extinguishers shall be located, tagged, inspected, and  
maintained as prescribed in Part 8. Portable Fire Extinguishers, being R 408.10801 et  
seq. of the Michigan Administrative Code. At a minimum, the following numbers of  
extinguishers shall be provided at the locations specified:  
(a) Four 20 lb., B-C rated extinguishers at the drilling rig.  
(b) Two 20 lb., B-C rated extinguishers at the well servicing rig.  
(c) One 20 lb., B-C rated extinguisher at each welding operation.  
(2) More or larger extinguishers shall be provided where the type of operation  
produces more hazardous conditions.  
(3) Fire fighting equipment shall not be tampered with and shall not be removed  
for other than fire protection and fire fighting purposes.  
History: 1979 AC; 1989 AACS.  
R 408.15716 Housekeeping.  
Rule 5716. (1) Work areas shall be kept reasonably clean and free of debris in  
order to minimize slip and trip hazards. Hazardous leaks or spills shall be promptly  
cleaned up to minimize slipping and fire hazards.  
(2) Material used for cleaning shall have a flash point of not less than 100 degrees  
(3) Means shall be provided to convey any hazardous substances away from the  
rig floor while pulling wet strings of pipe.  
History: 1979 AC.  
Page 7  
R 408.15717 Wells containing hydrogen sulfide.  
Rule 5717. (1) Drilling and servicing of wells shall be as prescribed in the American  
Petroleum institute document, RP49, reissued 1975, Recommended Practices for Safe  
Drilling of Wells Containing Hydrogen Sulfide. This document is incorporated herein by  
reference. The API document 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 information may be purchased at a cost of $125.00  
from IHS Global, 15 Inverness Way East, Englewood, Colorado, 80112, USA, telephone  
(2) Where hydrogen sulfide or any other unusually hazardous gas is known or suspected  
to exist, the employer shall advise the employees of the possible exposure involved and  
shall provide training and personal protective equipment as required in Rule 5711 of this  
(3) Where it is not necessary to maintain a cellar on wells producing hydrogen sulfide,  
the cellar shall be filled to eliminate the hazard of accumulation of hydrogen sulfide gas.  
History: 1979 AC; 2013 AACS.  
R 408.15718 Rig access; ladders, stairways, ramps, platforms, and elevators.  
Rule 5718. (1) A rig must be equipped with stairs, ladders, or ramps. An employee  
shall not jump from one level to another.  
(2) A fixed ladder, stair, ramp, or platform must be constructed and maintained in  
compliance with General Industry Safety and Health Standard Part 2. “Walking-Working  
Surfaces,” being R 408.10201 to R 408.10241 of the Michigan Administrative Code.  
Where structural crosspiece of a rig does not allow the required horizontal clearance  
prescribed in General Industry Safety and Health Standard Part 2. “Walking-Working  
Surfaces,” the clearance may be reduced to not less than 4 inches.  
(3) A derrick and mast must be equipped with a fixed ladder providing access from  
the rig floor to the crown block platform and to each intermediate platform on the  
(4) A minimum of 2 escape routes must be available to provide alternate exits from  
the rig floor to ground level when the rig floor height is 6 feet or more.  
(5) When a working platform is in the folded or storage position, the platform must  
be secured with not less than 2 fasteners of a type that will not vibrate loose or come  
loose accidentally. Clevis hooks, safety hooks, or other equivalent devices must be used  
for this purpose.  
(6) When an employee cannot perform necessary duties on a well servicing rig from  
ground level, a working platform must be used around the wellhead. The platform must  
be of sufficient size and so constructed to allow 2 men to work from it.  
(7) Each finger of a finger board must be bolted, welded, hinged and pinned, or  
attached by other equivalent means to its support beam.  
(8) When climbing a rig ladder, tools or other materials must be properly secured to  
the employee so that the hands of the employee are free for climbing.  
(9) An employee engaged in a well servicing or drilling operation may ride an  
elevator, sometimes called a traveling block, if both of the following provisions are  
Page 8  
(a) The employee riding the elevator is provided with and uses a safety belt or safety  
harness with a lanyard, as prescribed in R 408.15713(4), that is attached and adjusted to  
prevent a fall of not more than 6 feet.  
(b) The elevator is not under load.  
History: 1979 AC; 1983 AACS; 1989 AACS; 2019 AACS.  
R 408.15719 Auxiliary escape.  
Rule 5719. (1) A means of escape shall be rigged and secured to provide a safe  
and readily accessible escape route from the derrick board before operations  
commence which require a crew member to be on the derrick board, excluding  
stabbing boards or other temporary platforms.  
(2) The emergency escape route shall be kept clear of obstructions. The escape  
equipment shall be arranged to carry the crew member away from the wellbore or  
drilling floor and to permit a safe landing.  
(3) If an escape line is used as the means of escape, all of the following  
provisions apply:  
(a) The ground anchor point of the escape line shall be located a minimum  
lateral distance from the derrick or mast equal to the height above the ground where  
the connecting point of the escape line is secured to the derrick or mast.  
(b) Tension of the escape line shall be periodically checked and adjusted to  
assure a safe landing for the user of the escape line. A safe landing means that a user  
using a manually operated braking emergency escape unit will stop a minimum of  
20 feet from the anchor point and a user using an automatic velocity-limiting  
device or controlled-descent device will stop a minimum of 5 feet from the anchor  
(c) Each employee regularly assigned to work from the derrick board shall be  
provided with an escape line.  
History: 1979 AC; 1989 AACS.  
R 408.15721 Construction of derricks and masts.  
Rule 5721. (1) A derrick or mast manufactured after November 21, 1979, shall have a  
permanent nameplate which is attached to the structure and which indicates all of the  
following information:  
(a) Name of manufacturer.  
(b) Model number and serial number.  
(c) Rating, including maximum static hook load capacity with the number of lines.  
(d) Whether guying is applicable and the recommended guying pattern. If guying  
requirements do not appear on the nameplates, the derrick or mast shall be guyed as  
prescribed by API SPEC 4E-1974, entitled “Specification for Drilling and Well Servicing  
Structures,” which is herein adopted by reference and may be inspected at the  
Page 9  
Department of Licensing and Regulatory Affairs, MIOSHA Standards Section, 7150  
Harris Drive, P.O. Box 30643, Lansing, Michigan, 48909-8143. The specifications may  
be purchased at a cost of $125.00 from IHS Global, 15 Inverness Way East, Englewood,  
Colorado, 80112, USA, telephone number: 1-800-854-7179 or via the internet at website:  
(2) An employee qualified in procedures for raising and lowering the mast shall be in  
charge of raising and lowering operations and shall do both of the following:  
(a) Visually inspect the raising or lowering mechanism.  
(b) Assure that all tools and materials which are not secured are removed from the  
(3) Only an employee required to carry out the operation shall be allowed in or under  
the mast unless it is in the fully raised or lowered position.  
(4) The mast shall be level and properly positioned before raising, lowering, scoping the  
structure, or tightening guylines.  
(5) Before imposing any load on a derrick or mast, all required load guys shall be  
properly tightened.  
(6) Mast crown sheaves shall be guarded to prevent the hoisting line from being  
displaced from the grooves during all operations.  
(7) A derrick board or other platform shall be constructed, maintained, and adequately  
secured to the structure to withstand the weight of employees and other stresses placed  
upon the platform.  
(8) An unguarded opening large enough to permit a person to fall through shall not exist  
between the beams or main supports of the crown block.  
(9) If bumperblocks are used under the crown block beam, a safety cable or strap shall  
be fastened along their full length with both ends secured to the derrick.  
(10) All counterweights above the rig floor, when not fully encased or running in  
permanent guides, shall have a safety chain or wire rope safety line anchored to the  
derrick or mast to secure them. The chain and wire rope shall be capable of sustaining the  
drop load and shall limit the drop counterweight to not less than 7 feet from the floor.  
(11) Load-bearing hydraulic jacks shall have a safety lock device, double valves, or the  
(12) A derrick, mast, and auxiliary parts shall be maintained in a safe condition.  
History: 1979 AC; 1989 AACS; 2013 AACS.  
R 408.15722 Derrick and mast foundations and guying.  
Rule 5722. (1) Foundations shall be capable of safely distributing the gross  
weight of the derrick or mast under the maximum anticipated hook load.  
(2) Guyline ground anchors shall be any type that satisfies the requirements  
of subdivision (a) of this subrule. Soil conditions, terrain, and the use of surrounding  
land determines the most applicable type of anchor. All anchors shall satisfy both of  
the following requirements:  
(a) An installed ground anchor, permanent or temporary, shall meet the pullout  
requirements for the conditions of service. The anticipated climatic conditions,  
including wind forces, for the geographic area shall be a prime consideration in  
determining the anchor pullout requirements and pattern spacing. Anchor breaking  
Page 10  
strength and pullout safety factors shall be in accordance with API SPEC 4E-1974,  
entitled "Specification for Drilling and Well Servicing Structures," which is adopted  
herein by reference in R 408.15721 (1) (d).  
(b) Where soil is corrosive, metal components of permanent ground anchors  
shall be galvanized or otherwise protected against corrosion.  
(3) For permanent-type ground anchors, the well  
representative pull tests for the geographical area and size and type of anchor  
involved. Representative pull tests shall be conducted along the anchor working  
plane. Records of representative anchor pull tests for the area shall be maintained.  
(4) Permanent anchors shall be inspected before each use by visually checking.  
If damage or deterioration is apparent upon inspection, anchors shall be pull tested.  
(5) Temporary ground anchors shall be of such type and so installed to provide  
pullout strengths which exceed the maximum anticipated guyline pull for the  
equipment to be used and the conditions of service. Records of representative anchor  
pull tests for the area and size and type of anchor shall be maintained.  
(6) A portable mast, either structure or pole type, that requires the use of external  
guylines to assure stability shall have the external guylines in place immediately  
following the raising and telescoping of the mast.  
History: 1979 AC; 1989 AACS.  
R 408.15723 Traveling blocks and crown blocks.  
Rule 5723. (1) A traveling block and its component parts shall be designed, constructed,  
and maintained as prescribed in API SPEC 8A-1976, entitled “Specifications for Drilling  
and Production Hoisting Equipment,” 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. The  
specifications may be purchased at a cost of $125.00 from IHS Global, 15 Inverness Way  
East, Englewood, Colorado, 80112, USA, telephone number: 1-800-854-7179 or via the  
(2) A traveling block, crown block, or related equipment shall not be subjected to any  
load in excess of its designed rating.  
(3) A hook for use with a traveling block to which equipment is either directly or  
indirectly attached shall be equipped with safety latch to prevent accidental release of the  
(4) A traveling block exposed to contact shall be guarded at the running nip point of the  
sheave and shall not be operated unless the guard is in place.  
History: 1979 AC; 1989 AACS; 2013 AACS.  
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  
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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,  
(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.  
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(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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