71020111131053855628_unsafe electrical equipment and connections 25.05.11

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Unsafe Electrical Equipment andConnections

Municipality of Abu Dhabi

25 May 2011

Eng. Sayed Sallam

Sr. HSE Engineer

Abu Dhabi Distribution Co.

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Main Topes

ADDC

Introduction

Electrical Hazard

Unsafe work practices

Elements of safe work practices

Conclusion

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Introduction

ADWEA - ADDC Water and Electricity Sector in Emirate of Abu Dhabi is

under control of the Abu Dhabi Water and ElectricityAuthority (ADWEA).

Abu Dhabi Distribution Co. one of ADWEA Companies,

was formed from on 1 January 1999. The Company isresponsible for the sale and distribution of water andelectricity, including operations, maintenance, meterreading, and customer billing.

Has 3000 direct employees and more than 3000

contractors employees working in behalf of ADDC ADDC provides services to 412,540 (Aug. 2010)

Customers ensuring compliance with the highest qualitystandards to the customer satisfaction in Emirate of AbuDhabi (excluding Al-Ain City). .

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TRANSCO

SCIPCO

TAPCO

ECPC

GTTPC

AMPC

BPC

APC

Se.CorP

ADNOC

ENG

Interconnection

Distribution

ADDC AADC

Structure of the Water and Electricity Sector inAbu Dhabi

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ADDC Geographical Zones

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ADDC Core Objectives To distribute water and electricity Reliably,

Efficiently and Cost Effectively withoutcompromise to Quality, Health, Safety and theEnvironment.

To continue to evolve and develop in order toachieve and maintain our position of leadershipwithin the regional utility sector and toultimately compare favourably with world classcompanies in the sector.

To support the rapid development of Abu DhabiEmirate as the utility service provider of choice.

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To plan, develop, maintain and operate a reliable, secure, safe and cost effective

water and electricity distribution system in Abu Dhabi.

ADDC will achieve this in all areas of its operations by:

Recruiting and developing a skilled workforce

Adopting highly advanced international standards; codes of practice;

management methods and technology

Commitment to Customers - Ethical Behavior & Integrity

Commitment to Employees - Excellence

Teamwork & Trust

Values

ADDC is committed to supporting the Government vision by becoming a leading water

and electricity distribution company, comparable with the best in the world.

ADDC will improve the quality and efficiency of its operations and customer service

delivery.

Vision

Mission

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ADDC PrioritiesService Delivery Perspective

1 - CUSTOMER 2 - COMMUNITY AND REPUTATION

ADDC-SD1 Deliver excellent customer serviceADDC-SD4 Support the development of Abu Dhabi

and contribute to the community

ADDC-SD2 Reduce commercial and technical lossesADDC-SD5 Develop and grow ADDC brand and

reputation

ADDC-SD3 Construct the necessary infrastructure to

provide essential services

ADDC-SD6 Protect the environment

Process & Technology Perspective

3 - PROCESS

ADDC-PT1 Implement the business planADDC-PT2 Provide tools and systems that

support the business

ADDC-PT3 Re-engineer processes to enhance

operational improvements

People Development Perspective

4 - PEOPLE

ADDC-PD1 Provide necessary learning and

development

ADDC-PD2 Implement competitive employment

policies

ADDC-PD3 Meet Emiratization target

ADDC-PD4 Provide a safe and healthy working

environment

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US 2003-2009 Statistical* shows total of38,124

occupational fatalities occurred from all causes

and 1,573 of those were due to contact with

electric current. The construction industry hadthe highest number of electrical fatalities (772),

followed by professional and business services

(188), trade, transportation, and utilities (164),

natural resources and mining (136), and

manufacturing (126)* Source Electrical Safety Foundation International http://esfi.org/index.cfm/page/Summary/pid/11740

Introduction

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There are types ofelectrical Hazards:

Injuries

Electrocution (death due to electrical shock)

Electrical shock

Burns

Falls

Fire

Explosion

Electrical Hazard

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Electrical Shock

Received when current passes through

the body

Severity of the shock depends on:

Path of current through the body

Amount of current flowing through

the body

Length of time the body is in the

circuit

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Effect of current on human body

Current Reaction1 Milliampere Perception level. Just a faint tingle.

5 Milliamperes Slight shock felt; not painful but disturbing. Average individual

can let go. However, strong involuntary reactions to shocks in

this range can lead to injuries.

6-25 Milliamperes

(women)

Painful shock. Muscular control lost.

9-30 Milliamperes

(men)

This is called the freezing current or "let-go" range.

50-150

Milliamperes

Extreme pain, Respiratory arrest, severe muscular

contractions. Individual cannot let go. Death is possible.

1,000-4,300Milliamperes

Ventricular fibrillation. (The rhythmic pumping action of theheart ceases.) Muscular contraction and nerve damage

occur. Death is most likely.

10,000

Milliamperes

Cardiac arrest, severe burns and probable death.

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Human Body Resistance

Skin Resistance is negligible at voltages above

600 volts

Dry Skin - 100,000 - 600,000 ohms

Wet Skin - 1,000 ohmsEar to Ear (internal) - 100 ohms

Head to Foot (internal) - 500 ohms

Hand to Foot (internal) - 400 - 600 ohms

Across Head (internal) - 100 ohms

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OHM'S LAW

The relationship between Voltage, Current

and Resistance may be expressed as

arithmetic equations.

V = (I) x (R)

(I)0.05 X (R)1000 = (V) 50 Volt

can cause a fatal shock

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Electrical Burns

These are caused by: Passage of heavy current through

the body

Direct contact with an electrically

heated surface.

Intense heat generated by arcing

from a short circuit.

Electrical burns are a very unpleasantform of burn and require

immediate medical attention.

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Falling

Falling is considered as working with electrical

equipments required using of portable

ladders, scaffolding and access equipments,

the falling from these equipments comes dueto the followings:

Electrocutions

Arc flash

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Fire

A large percentage of fires are of an electrical

origin, caused by one or more of the

following:

Sparks

Arcs

Short circuits

Overloading and old wiring

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Explosion

The main causes of electrically induced explosions are:

In situations where flammable gases or vapors arepresent so that a spark could initiate an event.

Where electric arcing takes place in a confined spacecausing intense local heating with a consequentbursting of the enclosure by the expansion of trappedair; or

Rechargeable batteries emitting hydrogen when beingcharged, giving rise to an explosive atmosphere. Suchoperations should therefore be carried out in a wellventilated area.

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Unsafe Working Practices

Electrical work in construction

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Contributing Factors that

Cause Hazards

The following factors contribute to creating hazards

when they are inappropriate, substandard or

allowed to deteriorate:

1. People2. Environment

3. Equipment

4. Materials5. Process

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Work

Elements of safe work practices

Equipment

EnvironmentMaterials

PeopleEmployers, employees andcontractors & public.

Machinery, electrical

equipments, plant and

vehicles.

Tools, raw materials,

chemicals, construction

materials, explosives.

Buildings, work space, lights,

noise air quality,

Temperature, raining etc.

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Danger

Procedures, work

instruction, PTW,

etc.

Training, Experience,

and competency etc

Tools, PPE,etc.

Engineering Control, i.e.

Design, protection system etc

Work

Equipment

Environment

Materials

People

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PeoplePeople working with Electricity shall be qualified

Qualified Person is being one of the following as ADDC SSR:

Competent Person

A person who has sufficient technical knowledge and experience to

recognize and avoid Danger and been appointed in writing by an

Authorization Officer of the Company to carry out defined duties. These

may include the maintenance of Equipment and the receipt andclearance of specified Safety Documents, in accordance with a

Competency Certificate

Authorized Person

A person who has sufficient technical knowledge and experience to

recognize and avoid Danger and has been appointed in writing by

an Authorization Officer of the Company to carry out defined duties.These may include the operation of Equipment and the

preparation, issue, and cancellation of specified Safety Documents, in

accordance with an Authorization Certificate

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ADDCCom

petency

Process

Project Division Manager

Nominated person (s) approved bythe consultant and meet the ADDC

requirements? If Yes, submit toHSEQ

Approval of Project Division means

the person (s) technically OK

Accepted Nominated Person

HSEQ Dept. Secretary

Verify all the submitted documents

Arrange an appointment for writtenexam and interview for the

nominated person (s) and inform

him (them)

Appointment for exam

Sr. HSE Eng. / HSE Eng.

Examine and interview thenominated person (s) as per the

HSE procedure

Result

PASSED

YES

Nominated Person

Study HSE Requirements / System

Safety Rules, know your scope ofwork and be ready for exam and

interview

Ready for exam

NO

HSEQ Manager

Approve the nominated personcertificate for 1 YEAR

and instruct the staff to issue IDCARD

HSE Approved Nominated Person

HSEQ Dept. Secretary

Issue ID CARD as per the

approved certificateIssue CARD for the approved

personKeep CARD copy + certificate in file

CARD/CERTIFICATE

END

Contractor PM / Consultant

Nominate person (s) for

CP / HSE EngineerDefining clearly the scope of work

using the application form

supported with all requireddocuments.

Submit to Project Division

Nominated Person Application

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Environment

Working environment can increase the electrical

hazard:

1. Poor lighting,

2. Extreme temperatures and humid weather,

3. Rainy weather,

4. Explosive ,

5. Poor housekeeping

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Equipments

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Equipments

Electrical Equipment is the

source of Hazard:

Working in/near electrical

equipment

Excavation near underground

services

Working near OHL Using of electrical cords

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Safety Clearances

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Safety Clearance

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Safety

Clearance

meter

Rated

System

Voltage

(kV)

Safety

Clearance

(Limited

Approach

Boundary)(cm)

Restricted

Approach

Boundary

(cm)

Prohibited

Approach

Boundary

(cm)

Up to 1 107 30 2.5

Up to 11 15366.0 18.0

22 183 79 26

33 183 79 26

The Safety Clearance and Approach Boundaries as indicated in the following

tables is for any Live Exposed fixed circuit part as per NFPA 70E Table 130.2 (C).

A distance of 50 cm shall also be maintained from that part of the insulators

supporting exposed High Voltage conductors, which is outside the

appropriate Safety Clearance.

50

cm

Safety

Cleara

nce


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SAFETY CLEARANCE

Safety Clearance

Low Voltage

Safety Clearance Pole

Mounted Tfmr

Safety Clearance

High Voltage

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To work safely with electrical equipment the

following are safety measures:

Isolate by qualified person

Make it dead (grounded)

Lock and Tag

Test and verify

Work under PTW

Supervise

Equipments

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Materials

This part includes:

Tools

Portable Electrical Equipments

Testing and verification equipments PPE

Spare parts

Other materials like ladders,

scaffoldings, mechanicalequipments (trucks, excavators,cranes, etc.

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Examples of Electrical PPE

Hazard Risk

Category 1

Hazard Risk

Category 2

Hazard Risk

Category 3

Hazard Risk

Category 4Hazard Risk

Category 0


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Work Process

The process of the work in the combination of

all 4 issues to ensure addressing all hazards:

Method Statement

Risk assessment

Define the control measures

Define role and responsibilities

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Conclusions

Electrical are highly hazard activities exceptthe following safety measured followed:

Work shall be done under control of qualifiedperson

Electrical equipment has been made safe by anqualified person

Materials used for work has been evaluated andsafety instruction has been given by qualifiedperson

Work has been assessed and controls are in place

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For more informationVisit www.addc.ae

Or Male HSEQ Dept at

[email protected]
http://www.addc.ae/mailto:[email protected]:[email protected]://www.addc.ae/