LEIA SAFETY CHARTER - Lift and Escalator Industry Association

Safety Training Presentation No 3 Electrically isolate and lock off when power is not required and when working close to unguarded machinery

V5-11 November 2012

Accidents Over the last 20 years there have been 12 fatal accidents within the UK lift and escalator industry How have the fatal accidents occurred?   

Falling from height Crushing/ struck by moving equipment Electricity

2

3

Electrically isolate and lock off when power is not required and when working close to unguarded machinery The Risk…  

 

Approximately 20 fatalities per year in UK (all industries). Electrical injuries caused by a range of voltages – dependant upon circumstances 230V can, and does kill… Equipment flashovers, burns, loss of muscle control, consequential falls from height etc.

4

Electrically isolate and lock off when power is not required and when working close to unguarded machinery The Risk…   

 

Shock is the effect of current flowing through the body Current does the damage Causes muscles to contract, tissue damage and internal burning Can cause cardiac arrest and respiratory failure The higher the current: the shorter the duration for injury

5

Electrically isolate and lock off when power is not required and when working close to unguarded machinery The Risk…  Threshold of sensation: 0.5mA  Threshold of pain: 5mA sufficient to cause spasms,  ‘Let-go’ current ( but still allowing ‘let go’ ): 10mA  Ventricular fibrillation (heart spasms): 50mA  60W light takes 250mA Source: DD IEC/TS 60479-1:2005 6

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 





NOTE: isolatewhen and lock off applies equally AlwaysElectrically take precautions working on or near liveto escalators, service lifts, lifting platforms and other electrical equipment. equipment inout addition to conventional lifts Lock and tag the supply [or, if not possible, remove the fuses and take them with you] when power is not required to perform the task. Ensure that you verify that the disconnection has been made 7

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 

 These are thewhen onesworking that survived Always take precautions near electrical equipment.

8

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity Always take precautions when working near electrical equipment. NOT a good Ellison switch with Isolator with out the supply [or, if not possible, remove the  Lock and example of tag handle handle drilled and drilled and isolation fuses and take them with you] when power is not required padlocked padlocked to perform the task. Two engineers each apply their own locks to secure isolation by using multi-lock hasp lock off devices

9

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity Always take precautions when working near electrical equipment. Lock and tag Verify Confirm Isolate Lock Off test isolated and device Tagout onthe supply [or remove the fuses and take themcircuit with you] when power is not required to perform the by confirming separate Out task. voltage present  Ensure that you verify that the disconnection has been made 10

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity

Never assume the disconnection has been successful – you need to check that the disconnect is effective and secured

11

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Lock off and Safe Working with Electricity

tag out to secure the equipment after isolating

12

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity “The test lamp or voltage detector should be proved to be working on a known live source, proprietary proving unit or built-in test feature before and after use. All line, neutral and protective conductors of the circuit should be tested and proved to be dead.” The Electrical Safety Council Best Practice Guide 2

13

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity Always take precautions when working near electrical “The test lamp or voltage detector should be proved to be working on a equipment. known source, proprietary unit orthe built-in testand feature before Lock andlive tag out the supplyproving [or remove fuses take and after use. All line, neutral and protective conductors of the circuit NOTE: The procedure for proving dead them with you] when power is proved notberequired to perform should bytouse a proprietary testthe should be tested and beof dead.” task. lamp orBest two-pole voltage detector as The Electrical Safety Council Practice Guide 2 recommended in HSE Guidance Note GS38: Electrical test equipment for use by electricians

14

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity

Consider other sources which could remain live – see later slide

15

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity Regulation 14 Work on or near live conductors No person shall be engaged in any work activity on or so near any live conductor (other than one suitably covered with insulating material so as to prevent danger) that danger may arise unless (a) it is unreasonable in all the circumstances for it to be dead; and (b) it is reasonable in all the circumstances for him to be at work on or near it while it is live; and (c) suitable precautions (including where necessary the provision of suitable protective equipment) are taken to prevent injury. Electricity at Work Regulations 1989 16

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 



When the equipment must remain energized, effective insulation and safe electrical working practices must be used e.g. insulating rubber gloves, eye protection, insulating rubber mats on floor, insulating plastic shroud, all before accessing live parts, electrically insulated tools to minimise the risk of injury. Avoid the chance of earthing yourself by removing or covering jewellery. 17

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 

When the equipment must remain energized, effective insulation and safe electrical working practices must be used e.g. insulating rubber gloves, eye protection, Precaution if equipment is insulating rubber mats on floor, insulating plastic shroud, Fitaccidentally an insulating to Verification Use an insulating of rubber liveshroud - use insulated Wear insulating rubber gloves protect against accidental gloves rubber no mat (BS 921) tools (BS EN 60900) and tools so that there electrically insulated injury. (BS EN is 60903)risk untilof isolation contact with live in terminals and maintain them good condition wear eye protection protect –Standard says notto more than against 18mmflash exposed tip

is proven

18

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity Without an insulating shroud it would be easy to make accidental contact with the live terminalsThe charred remains

Replacement leads required

of an electricians glasses after being caught unprotected in Poorly insulated tools a flash – more than 18mm of tip exposed. These should be discarded 19

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity When the equipment must remain energised, Removeeffective or cover watches, rings, necklaces (And insulation and safe electrical working practices must be And earrings?) used e.g. rubber gloves, rubber mats onbracelets? floor, insulating plastic curtain, electrically insulated tools.  Avoid the chance of earthing yourself by removing or covering jewellery.

20

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 





Give yourself as much room as possible and remember – keep the area free of surplus materials. There should be suitable light levels (200 lux) at point of work Replace all equipment covers on completion of work as soon as possible.

21

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 

Even though the mains three phase isolator to the control panel is switched off, other sources may remain live. Signals Transformers Door detectors

Door Transformers Signals Lighting Alarms detectors Fans

Lighting Alarms Fans

Think Are any of isolation other devices during connected the wholetoprocess the lighting – not just in the controller.circuit? What about the rest of the installation? 22

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 

Even after all power has been isolated there is also the danger of electric shocks from sources of stored energy. Charged capacitors Charged VF drives capacitors VF drives

23

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity 

Even after all power has been isolated there is also the danger of electric shocks from sources of stored energy. Charged capacitors VF drives These should be marked, but what if they aren’t?

24

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Safe Working with Electricity

These Discharge should these be or marked, take precautions but what ifagainst they aren’t? any stored energy with a Safe System of Work before working on them 25

Electrically isolate and lock off when power is not required and when working close to unguarded machinery The Charter also covers works close to or on unguarded machinery

26

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Before starting work on machinery...   

Display a sign at all landings – discourages interference Switch off the electrical or hydraulic supply and post a sign Lock off the switch or remove the valve lever, or use another method to ensure that the supply cannot be restored while work is going on

27

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Before starting work on machinery... 

Display a sign at all landings – discourages interference

28

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Before starting work on machinery... Display a sign at all landings – discourages interference  Switch off the electrical or hydraulic supply and post a sign …hydraulic oil supply…

Switch off electrical supply and/ or…

…and post a sign

29

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Before starting work on machinery... Display a sign at all landings – discourages interference Switch off the electrical or hydraulic supply and post a sign Lock off the switch to ensure it Remove hydraulic …put it in a  Lock off the switch or remove thebe valve lever, orwork use cannot restored while control leversecure place is going another method to ensure that theonsupply cannot be and… restored while work is going on

30

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Working on machinery 



Guards must be kept in position unless you need to remove them to carry out work Machinery must not be operated with the guards removed unless:

31

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Working on machinery Guards must be kept in position unless you need to remove them to carry out work  Machinery must not be operated with the guards removed it isunless: not practicable You have toawork safe system on the equipment, of work to do diagnose so faults, lubricate or adjust the equipment whilst stationary and with the guards in position AND 

32

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Working on machinery 



Inspect ropes only whilst they are stationary and wear gloves to inspect them Cleaning of rotating parts: ropes, chains, sheaves etc. must be done with the power isolated. Restore the power only to move the machinery to a new position and isolate again

33

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Working on machinery 





After handwinding, remove separate winding wheel and brake release After completing the work re-fix the guards with the correct number of bolts or screws Before supply is restored check no-one will be harmed

34

Electrically isolate and lock off when power is not required and when working close to unguarded machinery Supervision 

HSE advise that supervision arrangements must be appropriate and proportionate to the risk – work on or near to live conductors, inexperienced staff etc… 



Personnel under training need to be supervised

Auditing arrangements for peripatetic workers 

Ideally a formal inspection when manager goes on site to review and record evidence of safe working procedure.

35

36

LEIA Safety Charter 

Protect yourselves and others from falls and falling objects.



Use and verify Stop and other devices when accessing, egressing and working on car tops and in lift and escalator pits to ensure total control of the equipment.



Electrically isolate and lock off when power is not required and when working close to unguarded machinery.

37

LEIA Safety Charter 

Now being incorporated into the new edition of the LEIA Site Safety Handbook.



We ask you to sign in this handbook, to commit to the three elements of the Safety Charter

38

Thank You for attending

39