OAR 437-004-2900
Grounding and Bonding


(1)

The path from circuits, equipment, structures, and conduit enclosures to ground must be permanent and continuous with enough capacity to conduct safely the currents that might be imposed on it. The path must also have impedance low enough to limit the potential above ground and to result in the operation of the over current devices in the circuit.

(2)

Driven rod electrodes must, where practicable, have a resistance to ground not to exceed 25 ohms. Where the resistance is not as low as 25 ohms, use two or more electrodes connected in parallel.

(3)

Check grounding circuits to ensure that the circuit between the ground and the grounded power conductor has a resistance low enough to permit enough current to flow to cause the fuse or breaker to interrupt the circuit.

(4)

Conductors used for bonding and grounding stationary and moveable equipment must be able to carry the anticipated current.

(5)

Outside conductors, 600 volts, nominal or less. Paragraphs (a), (b), (c), and (d) below apply to branch circuit, feeder, and service conductors rated 600 volts, nominal, or less and run outdoors as open conductors. Paragraph (e) below applies to lamps installed under these conductors.

(a)

Conductors on poles must provide a horizontal climbing space not less than the following:

(A)

Power conductors below communication conductors — 30 inches.

(B)

Power conductors alone or above communication conductors: 300 volts or less — 24 inches; more than 300 volts — 30 inches.

(b)

Clearance from ground to open conductors must conform to the following minimum clearances:

(A)

10 feet above finished grade, sidewalks, or from any platform or projection from which they might be reached.

(B)

12 feet over areas subject to vehicle traffic other than truck traffic.

(C)

15 feet over areas other than those in paragraph (5)(b)(D) below, where there may be truck traffic.

(D)

18 feet over public streets, alleys, roads, and driveways.

(c)

Conductors must have a clearance of at least 3 feet from windows, doors, porches, fire escapes, or similar locations. Conductors run above the top level of a window do not have to be 3 feet away.

(d)

Conductors must have a clearance of not less than 8 feet from the highest point of roofs over which they pass, except that:

(A)

Where the voltage between conductors is 300 volts or less and the roof has a slope of not less than 4 inches in 12, the clearance from roofs must be at least 3 feet; or

(B)

Where the voltage between conductors is 300 volts or less and the conductors do not pass over more than 4 feet of the overhang portion of the roof and they terminate at a through-the-roof raceway or approved support, the clearance from roofs must be at least 18 inches.

(e)

Lamps for outdoor lighting must be below all live conductors, transformers, or other electric equipment, unless the equipment has a disconnecting means that is lockable in the open position or unless there are adequate clearances or other safeguards for lamp replacement.

Source: Rule 437-004-2900 — Grounding and Bonding, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=437-004-2900.

437‑004‑0001
Application
437‑004‑0002
Scope
437‑004‑0003
Exclusive Coverage
437‑004‑0005
Access to Employee Exposure and Medical Records
437‑004‑0099
General Standards
437‑004‑0100
Universal Definitions
437‑004‑0150
Standards Organizations
437‑004‑0240
Safety Orientation for Seasonal Workers
437‑004‑0251
Safety Committees and Safety Meetings
437‑004‑0310
Working Surfaces
437‑004‑0320
Guarding Floor and Wall Openings and Holes
437‑004‑0330
Fixed Industrial Stairs
437‑004‑0340
Portable Ladders
437‑004‑0350
Orchard Ladders
437‑004‑0360
Fixed Ladders
437‑004‑0370
Scaffolding
437‑004‑0380
Manually Propelled Mobile Ladder Stands and Scaffolds (Towers)
437‑004‑0390
Other Working Surfaces
437‑004‑0405
Exits and Emergency Action Plan
437‑004‑0450
Emergency Action Plan
437‑004‑0570
Manlifts
437‑004‑0610
Ventilation
437‑004‑0630
Noise Exposure
437‑004‑0650
Ionizing Radiation
437‑004‑0710
Compressed Gases
437‑004‑0715
Acetylene
437‑004‑0716
Oxygen
437‑004‑0717
Hydrogen
437‑004‑0720
Flammable and Combustible Liquids
437‑004‑0725
Spray Finishing
437‑004‑0770
Explosives and Blasting Agents
437‑004‑0780
Storage and Handling of Liquefied Petroleum Gases
437‑004‑0790
Use of Liquefied Petroleum Gas or Natural Gas in Fields and Orchards
437‑004‑0800
Storage and Handling of Anhydrous Ammonia
437‑004‑0950
Hazardous Waste Operations and Emergency Response (HAZWOPER)
437‑004‑1005
General Requirements for Protective Equipment
437‑004‑1020
Personal Fall Protection
437‑004‑1030
Work Clothing
437‑004‑1035
Eye and Face Protection
437‑004‑1041
Respiratory Protection
437‑004‑1050
Head Protection
437‑004‑1060
Hand, Foot, and Extremity Protection
437‑004‑1070
Working Underway on Water
437‑004‑1075
Working Over or In Water
437‑004‑1105
Sanitation
437‑004‑1110
Field Sanitation for Hand Labor Work
437‑004‑1115
COVID-19 Workplace Requirements for Employer-Provided Labor Housing
437‑004‑1120
Agricultural Labor Housing and Related Facilities
437‑004‑1140
Lighting
437‑004‑1150
Safety Colors for Marking Physical Hazards
437‑004‑1180
Accident Prevention Signs
437‑004‑1250
Confined and Hazardous Spaces
437‑004‑1260
Manure Lagoons, Storage Ponds, Vats, Pits and Separators
437‑004‑1275
The Control of Hazardous Energy (Lockout/Tagout)
437‑004‑1305
Medical Services and First Aid
437‑004‑1430
Sources of Fire
437‑004‑1440
Required Postings
437‑004‑1450
Extinguishers
437‑004‑1460
Fire Prevention Plan
437‑004‑1470
Employee Equipment and Training
437‑004‑1505
Air Receivers and Pressure Systems
437‑004‑1525
Boilers and Steam Systems
437‑004‑1610
General Requirements
437‑004‑1630
Conveyors
437‑004‑1670
Automotive Hoists
437‑004‑1680
Storage of Hazardous Chemicals
437‑004‑1700
Forklifts and Other Powered Industrial Trucks
437‑004‑1750
Helicopters
437‑004‑1805
Rope, Chain, Rigging, and Hoists
437‑004‑1825
Tackle and Hoisting Equipment
437‑004‑1910
General Equipment Guarding
437‑004‑1940
Farm Field Equipment
437‑004‑1970
Farmstead Equipment
437‑004‑2000
Powered Saws
437‑004‑2100
Grinders
437‑004‑2220
General Requirements — Small Tools
437‑004‑2230
Guarding and Operation of Portable Powered Tools
437‑004‑2240
Power Lawnmowers
437‑004‑2260
Other Portable Tools and Equipment
437‑004‑2310
General Requirements
437‑004‑2350
Oxygen-Fuel Gas Welding and Cutting
437‑004‑2400
Arc Welding and Cutting
437‑004‑2810
General Requirements
437‑004‑2850
Temporary Lighting and Wiring
437‑004‑2860
Flexible Cable and Extension Cords
437‑004‑2870
Attachment Plugs and Receptacles
437‑004‑2880
Cord and Plug-Connected Equipment
437‑004‑2900
Grounding and Bonding
437‑004‑2950
Switches and Circuit Breakers
437‑004‑3000
Identification and Load Ratings
437‑004‑3050
Work Near Overhead Lines
437‑004‑3075
Agricultural Buildings with Special Hazards
437‑004‑3100
Excavation
437‑004‑3410
Agricultural, Commercial and Industrial Vehicles
437‑004‑3420
Working from Vehicles and Vehicle Loads
437‑004‑3430
Training for Agriculture Tractor Operators
437‑004‑3460
Industrial Vehicles
437‑004‑3480
Bridges, Roads and Ramps
437‑004‑3550
Servicing Multi Piece and Single Piece Rim Wheels
437‑004‑3600
Roll-Over Protective Structures (ROPS) for Tractors in Agriculture
437‑004‑3650
Roll-Over Protective Structures — Industrial Vehicles
437‑004‑3660
Vehicle-Mounted Elevating and Rotating Work Platforms
437‑004‑6000
Adoption by Reference of Federal Standard
437‑004‑6001
Expiration and Implementation Dates
437‑004‑6401
Effective dates for worker training programs in Oregon
437‑004‑6405
Restrictions Associated With Outdoor Production Pesticide Applications
437‑004‑6406
Pesticide Spray Drift and Innovative Methods
437‑004‑6501
Handler training programs in Oregon
437‑004‑6502
Oregon requirements for Worker Protection Standard trainers of handlers who qualify using train-the-trainer programs
437‑004‑6508
Respiratory Protection
437‑004‑6509
Emergency eye-washes and eye flushing supplies
437‑004‑9000
Oregon Rules for Air Contaminants
437‑004‑9010
Fumigated Areas.
437‑004‑9050
Asbestos
437‑004‑9090
13 Carcinogens
437‑004‑9600
Lead
437‑004‑9620
Cadmium
437‑004‑9626
Chromium (VI)
437‑004‑9640
Benzene
437‑004‑9650
Bloodborne Pathogens
437‑004‑9710
Acrylonitrile
437‑004‑9720
Thiram
437‑004‑9740
Ethylene Oxide
437‑004‑9760
Formaldehyde
437‑004‑9780
Methylendianiline
437‑004‑9800
Hazard Communication Standard for Agricultural Employers
437‑004‑9830
Retention of Department of Transportation (DOT) Markings, Placards and Labels
437‑004‑9850
Pipe Labelling
437‑004‑9860
Hazardous Chemicals in Laboratories
Last Updated

Jun. 8, 2021

Rule 437-004-2900’s source at or​.us