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Safe Work Near Overhead Lines AIAC 10 th December 2008. Bill Bates DMS CEng FIEE FIET HM Principal Electrical Inspector Health & Safety Executive. Safe work near overhead lines. Incident Analysis Safe Working Near Overhead Lines Innovation Prevention Initiative.

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safe work near overhead lines aiac 10 th december 2008

Safe Work NearOverhead LinesAIAC10th December 2008

Bill Bates DMS CEng FIEE FIETHM Principal Electrical InspectorHealth & Safety Executive

safe work near overhead lines

Safe work near overhead lines

Incident Analysis

Safe Working Near Overhead Lines

Innovation

Prevention Initiative

incidents

Road shut after tractor brings down power lines

Peterborough Today

Published Date: 24 September 2008

By Tara Dundon

TRAFFIC was brought to a standstill on the busy A1073 road near Peterborough yesterday (23 September) after a tractor hit an electricity pylon.

Police closed the road fearing that overhead power cables might fall across the carriageways.Homes in the area were without power for about five hours.The incident occurred on the A1073, half a mile north of Mason\'s Bridge near Eye Green at 3pm yesterday.Hundreds of motorists and lorry drivers faced lengthy delays while emergency services secured the cables, which were hanging dangerously low over the road.The road was reopened at about 6pm after police and Highways Agency officials cut the power cable and removed it from the road.However, the road was then closed again at around 9pm to allow electricity board EDF energy to repair the cable.

Incidents

STOPPING TRAFFIC: The A1073 near Peterborough was shut after a tractor brought down power lines. Picture: ALAN STORER

incidents1
Incidents

Divine intervention:

risk of contact with overhead lines
Risk of Contact with Overhead Lines
  • Reported to HSE under RIDDOR:
    • 10 reported fatalities in 2005-06
    • 1335 contacts with overhead lines (1998-2003)
    • 8 fatalities and 72 major injuries (2001-2002)
    • 8 fatalities and 51 major injuries (2002-2003)
    • In Agriculture, 31 fatalities

(1992-2002)

slide25

Overhead Line Incident Statistics

- Fatalities

  • Over 10 yr period ending 31 March 2007:
  • 136 persons were killed by coming into contact with electricity company equipment who were not engaged in activities associated with electricity supply (i.e. members of the public or employees engaged in other activities not associated with electricity supply)
  • 123 deaths (90%) associated with overhead lines
  • 24 deaths (18%) related to use of ladders, poles, scaffold, columns etc in close proximity to overhead lines
  • 19 deaths (14%)related to use of tippers, hiabs, harvesters etc in close proximity to overhead lines
  • Over last complete year (period 2006/7):
  • 7 deaths (out of total 20 deaths) attributed to such activities
  • Source: Electricity Incidents Database – data provided by duty holders under ESQCR Reg 31
slide26

Overhead Line Incident Statistics

- Injuries & Near Misses

  • Injuries
  • Typically average 330 persons per year over last 10 years
  • For last complete year (2006/7), 316 persons injured
  • 53 injuries (17%) associated with contact with overhead power lines
  • 7 injuries (2%) related to use of ladders, poles etc in close proximity to overhead lines
  • 11 injuries (3%) related to use of tippers, hiabs, harvesters etc in close proximity to overhead lines
  • Near Misses
  • 4,321 recorded incidents in 2006/7
  • 2,468 incidents (57%) related to contact with overhead power lines
  • 339 incidents (8%) related to use of tippers, hiabs, harvesters etc
  • 25 incidents (0.6%) related to use of ladders, poles etc
  • Source: Electricity Incidents Database – data provided by duty holders under ESQCR Reg 31
slide27

Overhead Line Incident Statistics

- Summary

Typically:

  • 4-8 deaths per year where persons engaged in work activities other than those associated with electricity supply come into contact with overhead power lines
  • 15-30 injuries
  • 350-500 near misses

There is a significant probability of death or injury arising from contact with overhead power lines

my incidents with overhead lines
My Incidents with Overhead Lines
  • Investigated serious incidents 2001-08:
    • 6 Fatalities and 4 serious injuries (2001-2008)
    • All not using safe system of work
slide32
Risk:
  • Overhead line strikes are potentially fatal even at 230 Volts. The effect of shock to the body can be calculated using the standard
hierarchy of safety measures
Hierarchy of safety measures
  • 1 : Eliminate the risks
  • 2 : Implement risk reduction by design
  • 3 : Use safe system of work
  • 4 : Use trained and competent persons
  • 5 : Use protective equipment or PPE
avoid danger
Avoid Danger:
  • Plan the work - Decide if work can be carried out away from the line
avoid danger1
Avoid Danger:
  • Consult if working within 9m of wood pole line, 15m of towers
  • Can the line be diverted or made dead?
    • Allow time for diversion of line
    • Pre-planned outages can make line dead
identify appropriate precautions
Identify appropriate precautions:
  • Essential for liaison at all times between all parties
  • Talk to local electricity company about precautions and agree action
clearances
Clearances
  • Identify clearances:
    • Passing
    • Working
  • Do not measure vertical distance with tape
  • Identify height and reach of vehicles
  • Significant Risk
preliminary requirements
Preliminary Requirements
  • Risk Assessment
  • Safe systems of work
  • Properly trained people
  • Pre-plan work
    • Identify work locations
    • Identify plant to be used
preliminary requirements1
Preliminary Requirements
  • Site layout
    • Site Plans
    • Access routes
    • Passageways
    • Other restrictions
control work near lines
Control Work near lines:
  • Lines are treated live unless proved otherwise - lines can be reclosed or fail to trip
  • all people on site aware of danger and precautions including visitors
  • Adequate supervision and support
work areas where work will be done beneath the line
Work areas where work will be done beneath the line
  • Agricultural (1):
    • Assess for significant risk
    • Identify overhead lines and mark up on suitable plan or farm map, available at all times
    • Restrict activities within 9m of pole lines and 15m of tower lines
    • Arrange for alternative overhead lines at high risk areas
work areas where work will be done beneath the line1
Work areas where work will be done beneath the line
  • Agricultural (2):
    • Mark safe routes and safe unloading areas
    • Use warning notices
    • May be impractical to erect barriers and goalposts
    • Check max heights for tall equipment
    • Restrict height of farm equipment to 4m
work areas where work will be done beneath the line2
Work areas where work will be done beneath the line
  • Agricultural (3):
    • Train to know dangers and take precautions
    • Contractors and drivers to be instructed of precautions and routes
if you are involved in a vehicle overhead line strike 1
If you are involved in a vehicle - overhead line strike (1):

Know what to do in the case of an incident:

  • stay in seat
  • keep others away
  • try to drive clear
if you are involved in a vehicle overhead line strike 2
If you are involved in a vehicle - overhead line strike (2):
  • If you do need to get out, jump clear
  • don’t touch vehicle or step down
  • Jump away, ground can be live
  • Don’t try to go back to the line or vehicle until line owner says it is safe – lines may re-energise without warning
precautions for safe working1
Precautions for Safe Working
  • Electricity systems carry voltages up to 400kV
  • 230 Volts can even be fatal
  • Never assume electrical equipment is dead, even if the wires have fallen or are broken
  • Even if you are sure the power is off, remember it can be turned back on with no warning
precautions for safe working2
Precautions for Safe Working
  • Touching electric wires or objects/persons in contact with the wires can be fatal
  • Electricity can jump
  • Rubber boots will not protect you
  • Most overhead power lines are not insulated
  • Do not assume wires on wood poles are telephone wires
ena guidance
ENA Guidance
  • ENAS 43-8
  • ENA ER G 55/1
emergency contact numbers
Emergency Contact Numbers

Numbers and ownership information should be on substations, poles and towers:

EDF Energy East - 0800 7838838

Scottish and Southern Energy – 08000 727282

National Grid – 0800 777770

Central Networks East – 0800 0568090

innovation
Innovation
  • Overhead Line Detectors
    • Detection principle effectiveness
    • Sensitivity, interference and nuisance
    • Safety integrity
    • Potential damage
    • Substitute for safe system of work
    • Undulating ground
    • Introducing dangerous voltages into cab
    • Maintenance
innovation1
Innovation
  • Mapping Systems
    • Data accuracy and availability
challenge
Challenge

Reduce incidents and eliminate injuries by

  • Eliminating risk
  • Better design
  • Safe systems of work
  • Increasing risk awareness
  • Improved advice and guidance
  • Improved communication
  • Better leadership to ensure compliance
  • And don’t forget to STOP AND LOOK UP!
5 steps to risk assessment
5 Steps to Risk Assessment
  • Step 1 : Look for the hazards
  • Step 2 : Decide who might

be harmed and how

  • Step 3 : Evaluate the risks

and decide whether

the existing

precautions are

adequate or whether

more should be done

5 steps to risk assessment1
5 Steps to Risk Assessment
  • Step 4 : Record your findings
  • Step 5 : Review your

assessment and

revise it if necessary

  • Communicate the findings
precautions 3 situations
Precautions - 3 situations:
  • Work areas where there will be no work or passage of plant under the lines  
  • Work areas where plant will pass under the lines
  • Work areas where work will be done beneath the line
work areas where there will be no work or passage of plant under the lines
Work areas where there will be no work or passage of plant under the lines 
  • Barriers parallel to line at min 6m to prevent access
  • Bunting for additional higher level encroachment (eg crane jib)
  • Bunting further away from line
  • Increase clearance distance by length of crane jib
work areas where there will be no work or passage of plant under the lines1
Work areas where there will be no work or passage of plant under the lines 
  • If both sides are worked then barrier on both sides
  • People prevented from carrying long items under line
  • Use substantial barriers, fence, drums, earth bank, timber baulk
  • Prohibit storage under line
work areas where plant will pass under the lines
Work areas where plant will pass under the lines

Where there is significant risk:

  • Use defined passageways
  • Minimum number of passageways
  • Goalpost each side of line
  • Rigid non-conducting goalposts, or tensioned ropes for wide access points
work areas where plant will pass under the lines1
Work areas where plant will pass under the lines
  • Warning notices, stating clearance height allowed
  • Lit at night
  • Warning notices 30m away on approach
  • Surface level and firm in passageway
work areas where plant will pass under the lines2
Work areas where plant will pass under the lines
  • Consider stopping distance if goalpost struck
  • Other precautions
work areas where work will be done beneath the line3
Work areas where work will be done beneath the line
  • Work at ground level under line (1):
    • Safe clearance ascertained from electricity company
    • No other plant or equipment that could encroach that clearance taken into account
work areas where work will be done beneath the line4
Work areas where work will be done beneath the line
  • Work at ground level under line (2):
    • Physical restraints to crane jib to prevent going beyond safe limit
    • Mechanical stops or limit switches etc
    • Additional restraints for additional jibs
    • Direct supervision by suitable person to ensure precautions observed
ad