changes to nfpa 70e - ue systems · changes to nfpa 70e - the role of pdm &safe pdm work...

Changes to NFPA 70E

- The Role of PdM &Safe PdM Work Practices

Tim RohrerExiscan [email protected]

Joe [email protected]

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Electrical Safety

Risk Management Strategies

Relevant Changes to NFPA 70E

What it Means for Your PdM Group

Practical Applications

HELLOMy Name Is

TIM

HELLOMy Name Is

Joe

Electrical Safety- A Different Perspective

Electrical Hazards are Unique


U.S. BLS Economic News Release, 2010

Non-Fatal Occupational Injuries

0.16%Electrical



1. Burns

2. Shock



1. Transportation

2. Violence

3. Falls

4. Struck by…

5. Crushed

6. Exposure

7. Electrical


300 : 1


300 : 1

10 : 1Electrical

Tim RohrerExiscan™[email protected](585) 366-0333

Hazard v/ Risk

Hazard & Risk

Hazard:

“A source of possible injury or damage to health.”

NFPA 70E-2015; Article 100

Hazard & Risk

NFPA 70E-2015; Article 100

Risk:

Refers to a combination of both the likelihood of injury occurrence and the severity

Hazard v/ Risk

Hierarchy of Risk Control

1. Hazard Elimination

2. Substitution

3. Engineering Controls

4. Warnings

5. Administrative Controls

6. PPE

ANSI Z10

Closed-Panel Inspection

Eliminated Hazardous Tasks

Changes to 70E

- (Highlights)

What is NFPA 70E?

Consensus Standard- Electrical Safety in the Workplace

Foundation for ESP

3 yr. Revision Cycle

Industry Additions in Scope

70E-2012 Scope Includes Utilities

70E-2015 Scope Includes Mining

Intervals

Auditing the Electrical Safety Prgm.

3 yr.

Intervals

Auditing Field Work

Annually

Intervals

Annual Training:

• Emergency Response

• Contact Release• CPR• AED• Training Verification

New Terms &

Concepts

Normal Operation

Previous Revisions:Enclosed electrical equipment that has been properly installed and maintained, and is under normal operating conditions is “not likely” to pose an a hazard.

Normal Operation

4th Clause Added to Energized Work:

Normal Operation of equipment will be permitted as long as the equipment is properly installed and maintained, doors and covers are closed and secured, and there is no evidence of impending failure.

Hazard & Risk

Hazard Analysis

“Risk Assessment”

Hazard & Risk

Risk Assessment:

“A process that identifies the hazards, estimates the potential severity of injury or damage to health, estimates the likelihood of the injury occurrence or damage to health, and determines if protective measures are required ”

Changes to

Boundaries

Prohibited Approach Boundary

Prohibited Approach Boundary

No longer a trigger for PPE or protective action

Energized Work Permits

EWP Required When:

• Inside Restricted Approach Boundary (from Limited)

• Risk of injury due to Arc Flash

Conductive Articles

No Bling Zone:

Restricted Approach Boundary

Barricades

Greater of:

• Limited Approach Boundary

• Arc Flash Boundary

Changes to PPE

Rules

PPE Selection

Selection of PPE by:Tables OR Incident Energy Analysis

11th Commandment:“Thou shalt not mix and match!”

PPE Selection

Hazard/Risk Category

“Arc Flash PPE Category”

PPE Selection

Tasks Performed on Energized EquipmentHazard/Risk

Category

Rubber Insulating

Gloves

Insulating and

Insulated Hand Tools

600 V class switchgear & switchboardsParameters:

Maximum of 35 kA Short Circuit current available;Maximum of 0.5 sec (30 cycle) fault clearing time; Minimum 18 in. working distance

Potential Arc Flash Boundary: 233 in.

Removing bolted covers to expose energized conductors 4 N N

Racking circuit breaker – doors open / closed 4 N N

IR scan or other non-contact inspections outside the Restricted Approach Boundary

2 N N

Reading a panel meter while operating a switch 0 N N

OLD TABLE METHOD

PPE Selection

Task Equipment Monitoring

Arc Flash PPE

Required

Removing bolted covers or using hinged doors to open an enclosure, exposing energized electrical conductors or circuit parts.

Any Yes

Performing Infrared Thermography Outside the Restricted Approach Boundary

All of the following:• Properly installed• Properly maintained• Other covers in place and secured• No evidence of impending failure

NO

ANY of the following:• NOT properly installed• NOT properly maintained• Covers NOT secured and in place• Evidence of impending failure

YES

PPE Selection

Tasks Performed on Energized EquipmentArc Flash PPE

CategoryArc Flash Boundary

Panel Board 240V & BelowParameters:


1 19 in.

600 V class switchgear & switchboardsParameters:


4 20 feet

PPE Category 0

70E & Your PdM

Program

70E & PdM

Arc Flash Hazard ID Table:

Forces the worker to consider status of equipment maintenance prior to selecting PPE, and prior to work

70E & PdM

Scope includes “safety-related maintenance requirements, and other administrative controls.”

70E & PdM

110.1(B): Electrical Safety Program shall include elements that consider condition of maintenance of electrical equipment and systems.

70E & PdM

Article 200: Safety-Related Maintenance Requirements, General Maintenance Requirements:

Equipment owner or it’s representative are responsible for maintenance of their electrical equipment

70E & PdM

Article 200: Safety-Related Maintenance Requirements, Informational Note:

Label System: • Calibration• Condition • Inspection Status

70E & PdM

130.5(3) Arc Flash Risk AssessmentInfo Note #1

Where equipment is not properly installed and maintained, PPE selection…may not provide adequate protection from arc flash hazards.

70E & PdM

Article 210.5 Info Note: :

“Improper maintenance of protective devices can result in increased clearing times, which thereby results in higher incident energy.”

Practical

Applications

Maintenance - Expanded

Three main components relative to maintenance

• Circuit Breakers (thermal magnetic, air, OCB, SF6, Vacuum)

• Fuses ( Dual Element / Time Delay, Current Limiting)

• Protective Relays (Electromechanical, Solid State,

Multifunction Microprocessor)


• Circuit Breakers (thermal magnetic, air, OCB, SF6, Vacuum)

• Testing Considerations• Testing Frequencies• Testing Results• How these impact arc flash energies



• Fuses ( Dual Element / Time Delay, Current Limiting)

• No Test Method (Destructive)• Selective Coordination• Installation Considerations (Same

manufacturer, class, type, ampacity)• How these impact arc flash energies



• Protective Relays (Electromechanical, Solid State,

Multifunction Microprocessor)

• Testing Considerations (Much more “complex”)

• Serves purpose of breakers and relays• Single or Multi Function• How these impact arc flash energies



Types of Testing:

• Maintenance

• Functional

• Visual

• Physical and Mechanical


Types of Testing:

• Maintenance

• Used to determine the integrity of the insulation system

and contact/connection health


Types of Testing:

• Functional

• Only method of determining if the device will operate in

the prescribed time periods for different levels of fault

currents


Types of Testing:

• Functional

• Simple rule of thumb:

• The FASTER a fault is interrupted, the lower the arc

flash energies produced.


Types of Testing:

• Functional

• The devices must do 2 things on any fault:

• Recognize the fault

• Interrupt the fault


Types of Testing:

• Functional

Determine long-time pickup and delay by primary current injection.

Determine short-time pickup and delay by primary current injection.

Determine ground-fault pickup and delay by primary current injection.

Determine instantaneous pickup current by primary current injection.

There are 4 possible functions of any overcurrent device

depending on design and purpose, as outlined in NETA


Types of Testing:

Long-time delay -The length of time the circuit breaker will carry a sustained

overcurrent (greater than the long-time pickup) before initiating a trip signal.

Long-time pickup - The current level at which the circuit breaker long-time

delay function begins timing.

Short-time delay - The length of time the circuit breaker will carry a short

circuit (current greater than the short-time pickup) before initiating a trip signal.

Short-time pickup - The current level at which the circuit breaker short time

delay function begins timing.


Types of Testing:

Instantaneous pickup - The current level at which the circuit breaker will trip

with no intentional time delay.

Instantaneous trip - A qualifying term indicating that no delay is purposely

introduced in the tripping action of the circuit breaker during short-circuit

conditions.

Ground-fault delay - The length of time the circuit breaker trip unit will delay

before initiating a trip signal to the circuit breaker after a ground fault has been

detected.

Ground-fault pickup - The level of ground-fault current at which the trip

system begins timing.


Types of Testing:

• Mechanical

• Bound Parts

• Misaligned linkages

• Worn parts

• Lubrication issues

• Foreign debris/contaminants

• Calibration/Adjustment Issues

Even if the device operates in the correct time frame, lack of

maintenance can inhibit operation due to the following

things:

Summary

Summary

Electrical Hazards & Risks are Unique

Use Higher Order Risk Controls

NFPA 70E Makes Your PdM Group More Important than Ever!!!

Thank You!

Tim RohrerExiscan [email protected]

Joe [email protected]

changes to nfpa 70e - ue systems · changes to nfpa 70e - the role of pdm &safe pdm work...

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