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EWP 10 Basic Electrical Safety Industry Worker

GL00312_1095

DOW RESTRICTED - For internal use only

IntroductionLearning Objectives • At the end of this course you should be able to:

– As a General Industrial Worker (i.e., not an Electrical Qualified Instructed or Skilled Person) understand that you cannot work or use tools near exposed energized electrical conductors.

– Have knowledge of the requirement to use Ground Fault Circuit Interrupters (GFCI's) and Residual Current Device (RCD) with portable electric powered tools.

– Have knowledge of the requirement to inspect portable electric powered tools and what these inspections are..– Have knowledge of the requirements for portable and mobile generator use.

Target Audience • All .Dow employees and Contractor employees working on Dow premises who meet the definition of a General Industry Worker:

– A person who can be involved with work near electrical installations but does not perform work within the Electric Shock Hazard Distance (ESHD),

– A person who cannot be involved with work within the Electric Arc Flash Hazard Distance (EAFHD) while electrical work is being performed.

– A person who can use electrical driven tools and equipment for general industrial work. – A person who can use portable and mobile generators

Other Information • Time Required to Complete Course: 30 Minutes.

Note: Self-contained battery-powered portable electrical equipment is not addressed by this work practice. For more detailed information on the Electrical Safety Standard, click on the links button in the navigation bar.

General Requirements – Overhead Lines• Maintain a minimum separation distance for shock hazard protection

from energized exposed parts and bare overhead lines of at least 3 meters (10 feet) for systems less than 50 kV and 5 meters (16 feet) for systems 50 kV to 230 kV. Approaching closer than these distances and up to but not within the EAFHD of energized exposed parts and bare overhead lines may be allowed with additional review and precautions implemented by an Electrical Skilled Person.

• Additional precautions may include barriers, installation of electrical rubber insulating goods, observers/attendants or other means.

• Do not perform any task that requires penetration of this distance. • Equipment and tools are considered to be extensions of the body.

Examples include ladders, pipe, conduit, tools and similar equipment that can extend the reach of the body to an unsafe distance.

• These extensions of the body must be considered as part of the minimum approach distance.

General Requirements – Electrical Equipment

• you are not an Electrical Instructed or Electrical Skilled Person:

• 1. Do not work on, near, or with exposed energized electrical circuits and equipment.

• 2. Do not perform electrical repair work or diagnostic work on energized or non isolated electrical equipment. You must have authorization to perform work on de-energized and isolated electrical equipment.

Do not use metal ladders to perform work on or near exposed electrical equipment. Fiberglass side rails ladders are acceptable

Equipment and Energized Electrical Work

• Do not walk or stand on any cables which have not been properly protected. • While work is being performed in a confined space (e.g., Manhole)

containing energized electrical equipment, an employee with first aid and CPR training should be immediately available per the confined space entry rescue plan.

• Do not enter rooms or spaces with unguarded live parts while the electrical supply lines or equipment are energized.

• Any construction, installation, demolition, or maintenance work (for example drilling/sawing into walls or enclosures) that might damage or penetrate existing guarding or insulation of energized parts, and thereby cause inadvertent exposure to shock hazard, shall be considered energized electrical work.

• Do not open doors on electrical equipment or apparatus that may expose energized electrical parts.

Examples of portable electrical equipment

Examples of portable electrical equipment could be but not limited to, hand drills, hand saws, lighting, test instruments, heating devices and etc.

Minimum Safety Requirements

Portable electrical equipment shall meet one of the following requirements: 1) Be used with a GFCI/RCD or, 2) Be included in an annual inspection and testing program (Ground assurance).

Special Cases

In wet or damp locations portable electrical equipment shall be used with a GFCI. For work in “standing water” conditions, electrical equipment shall not be used without the advanced review by an Electrical Skilled Person. See EWP-22, Personal Protective Equipment (Rubber Insulated) for Shock Hazards, for PPE requirements.

Requirements for use of Portable Electrical Equipment

• Prongs• Insulation• Grounding• Adapters

Any deficiencies shall be repaired by an Electrical Skilled or Instructed Person before the portable equipment can be used

Plug prongs are not missing, loose, or bent. Where ground assurance inspection is used, the user must validate it is within the inspection date prior to use.

Prongs

Insulation

Insulation is not missing, cut, worn, abraded, or otherwise defective on the entire length of the cord.

Grounding

The portable electrical equipment is within the annual grounding assurance inspection date or it is labeled by the manufacturer as "double insulated". Otherwise it must be used with a GFCI/RCD.

If your site does not have a grounding assurance program, then GFCI/RCD use is required for all portable power tools that have a ground conductor.

Adapters

The use of adapters that convert a three-wire electrical tool to a two-wire, or modification of a ground prong or grounding conductor on three-wire equipment is prohibited.

Requirements for using GFCIs or RCDs• The requirements for using Ground Fault

Circuit Interrupters (GFCI’s) and Residual Current Devices (RCD’s) are:– When to use it?– How to use it?– How to test it?– How to reset it?– How to connect it?

When to use it?

• Personal electrical equipment shall be used with GFCI's/RCD's designed for personal protection when any of these conditions are met:– The equipment is not included in the grounding

assurance program or is not within the inspection date, or

– The equipment is to be used in a wet or damp location.

How to use it?

The user shall test portable GFCI's/RCD's before each use by operating the teper the manufacturer's instructions or by following instructions provided st and reset button by prior training or defined procedures. Damaged GFCI's/RCD's or those that fail the test shall not be used and shall be returned to an Electrical Skilled or Instructed Person for appropriate corrective action.

How to test it?Test the GFCI/RCD before plugging in any electrical equipment • Step one: Plug in the portable GFCI without any portable tools or loads plugged into the GFCI protected receptacle. • Step Two: If popped out, depress the reset button. If the reset button does not immediately “snap” in, unplug the portable GFCI and DO NOT USE. Contact an Electrical Instructed or Electrical Skilled Person for repairs. • Step Three: Depress the test button. If the reset button pops out, go to step four. If the reset button DOES NOT pop out, unplug the portable GFCI and DO NOT USE. Contact an Electrical Instructed or Electrical Skilled Person for repairs. • Step Four: Depress the reset button to energize the receptacle. GFCI is ready for use

How to test it?

At any time the test button does not trip the reset button or the reset button does not reset/snap in. The GFCI is faulty or a connected load is faulty. Unplug the portable GFCI and DO NOT USE. Contact an Electrical Instructed or Electrical Skilled Person for repairs.

How to reset it?A GFCI that de-energizes a circuit while in normal use must be reset only as follows: •Disconnect all loads or devices plugged into the GFCI (RCD) and turn all device switches to the off position. •Reset the GFCI (RCD) trip button. •If the GFCI (RCD) does not reset, push the test button to verify correct operation and try to reset the GFCI again. •If the GFCI (RCD) trip button cannot be reset, do not use the GFCI (RCD) and contact an Electrical Skilled or Instructed Person for assistance. •If the GFCI (RCD) continues to trip in use after successful resetting of the device, stop the job and contact an Electrically Instructed or Skilled Person to investigate the trips.

How to connect it?

GFCI's/RCD's shall be connected at the origin of the source of power (for example, at the point of connection to the permanent wiring system) or to a device or cord that is covered by the site grounding assurance program.

Requirements for using a Portable Generator

Portable or mobile generators, greater than 50 volts but less than 700 volts, which are not part of a permanent wiring system, must be inspected before use.

Portable Generator Inspection RequirementsThe user of portable generator shall comply with the following requirements for inspection before use: 1. Prior to starting and using a generator, the user shall: A. Inspect for attachment of generator ground cable when required. Generators above 12 kW shall be grounded. Generators at 12 kW and below shall be grounded if required by local codes or equipment manufacturer. I. When grounding is required, the generator frame shall be grounded by an Electrical Skilled or Instructed

Person prior to initial use of the generator. See Generator Grounding Guidance (Links). II. After initial ground sizing has been determined, with the portable generator off, a General Industrial

Worker (GIW) may connect or disconnect only a ground clamp to a ground electrode or to visibly grounded structural steel. Metal to metal connection free of dirt, corrosion, paint and etc must be made. Clean connections as needed.

III. Direct grounding of a generator to any process piping, or mechanical equipment is prohibited.IV. Where allowed by local codes, external generator frame grounding is not required if the other protection

methods are provided (e.g. “isolated net” or an “IT system” is used) B. Inspect for damaged or broken raceways, receptacles, or wiring. V. If any deficiencies from the visual inspection made prior to use are noted, do not use generator until

repaired by an Electrical Skilled or Instructed person. C. Understand how to operate and maintain the generator in accordance with the manufacturer’s instructions and procedures. 2. After the generator is started but before using, all GFCI/RCD receptacles or insulation monitoring devices, where installed shall be tested.