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Arboriculture Basic Electrical Knowledge > 1.1 > Flashcards

1.1 Flashcards

1
Q

Risk assessment process may contain the following 5 steps:

A
  • Identify the hazards
  • decide who may be hurt and why
  • evaluate the risks and decide on precautions
  • record the findings and implement them
  • review and update the assessment as necessary
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2
Q

Generic risk assessment:

A
  • use of chainsaw and machinery
  • procedures of working at height
  • procedures of live line and deadline working
  • repeated tasks and procedures
  • other
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3
Q

Site specific risk assessment:

A
  • Detailed hazards specific to site, tasks carried out, and work.
  • safety of public, property, and environment
  • details of trainees and supervisory levels.
  • other
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4
Q

Electric risk assessment:

A
  • Electric and tree related hazards clearly separated
  • Justification of any live working proposed
  • category of tree works clearly defined I.E Cat A-D
  • other
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5
Q

Requirements of appropriate site supervision may include:

A
  • name of operative(s) being supervised with age if relevant
  • operations being supervised
  • the supervisor(s)
  • level of supervision
  • details documented i.e within risk assessment
  • arrangements agreed with network operator
  • other
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6
Q

Emergency planning relevant to a work site may include:

A
  • site location
  • grid references with prefix
  • what three words
  • designated meeting place
  • nearest access point
  • street name/district
  • type of access
  • suitable for helicopter landing
  • nearest emergency services
  • phone number for closest doctors
  • works manager contact details
  • your own contact details
  • other
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7
Q

PPE that is required where appropriate:

A
  • high vis clothing
  • head protection
  • hand protection
  • foot protection
  • Eye protection
  • hearing protection
  • specialist equipment as specified by network operator
  • all ppe should comply with latest standards
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8
Q

Proximity zone one:

A
  • All trees that are to be felled within two tree lengths of any live equipment
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9
Q

Proximity zone two:

A
  • all trees to be dismantled, pruned or have other arboricultural work carried out on them that are within the following:

9m of any live equipment up to 66kv
15m of any live equipment over 66kv

  • only certified and competent operatives may work within proximity zones without any appropriate supervision of the network operator
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10
Q

Factors to consider with proximity zones when felling:

A
  • Network operator must be advised if work is to take place in proximity zones
  • distance is measures horizontally from a point directly beneath the nearest conductor to the base of the tree
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11
Q

Factors to consider in proximity zone when machinery is being used:

A
  • stated distances will be measured to the nearest point to the line that any part of the machine or load can reach
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12
Q

Factors to consider proximity zone on slopey ground:

A

Increase the distance to allow for the effect of the slope so that the task can be carried out safely
- the distance must be reassessed on the re commencement of work

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13
Q

Definition of the vicinity zone:

A
  • the zone around an exposed live circuit conductor which if maintained will prevent the danger of burn or electric shock
  • the live zone is included within the measurement of the vicinity zone
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14
Q

The vicinity zone distances for the following range of voltage:

A
  • LV = 1m
  • 11kv = 2m
  • 33kv = 2.5m
  • 66kv = 3m
  • 132kv = 3.5m
  • 275kv = 4m
  • 400kv = 5m
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15
Q

Factors to consider when applying the vicinity zone distance to a task:

A
  • different measurements for different voltages
  • the higher the voltage, the greater the distance so always select the greatest distance if in any doubt
  • if the vicinity zone distance is maintained it will prevent injury
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16
Q

Definition of live zone:

A

The zone around the exposed live circuit conductor where the danger of a burn or electric shock can occur if any part of a body or non insulated tool that is being used enters the zone.

17
Q

The live zone distances for the range of voltage:

A

**Lv = 0.3m
**11kv = 0.8m
**33kv = 0.8m
**66kv = 1m
**132kv = 1.4m
**275kv = 2.4m
**400kv = 3.1m

18
Q

How to prevent injury to site personnel:

A
  • ensure the work is carried out as defined by the risk assessment/method statement
  • maintain safety distances
  • always maintain awareness of vicinity zones, particularly when moving and handling timber and branches
  • locate underground cables and protect where necessary
  • locate other utilities I.E gas, water or sewer.
19
Q

Factors to consider when working in the designated area and when leaving the site safe for others:

A
  • ensure work does not interfere with other parties
  • always maintaining the general safe condition of site during and after work
  • ensure logs/brash/chippings are stacked clear of the line
  • acces points / Egress points kept clear
  • remove site spoil where appropriate
  • fences, ditches, paths, young trees, badger setts etc. Must be left undamaged
  • tools and equipment all removed from site
  • any hanging branches removed
20
Q

Factors to consider when carrying out ground work operations:

A
  • do not face the chipper in the direction of conductors of equipment
  • do not leave long branches on site where they can be handled later and breach vicinity zones
  • ensure a clear path is left under the conductors to allow access for future patrols and maintenance
  • do not stack timber adjacent to substation boundary fences that may allow climbing access
  • ensure that hanging branches are not left as a hazard for others
21
Q

Tree type and condition may change the electrical danger:

A
  • species different sap levels e.g willow will have high sap levels
  • spring = rising sap levels
  • full leaf/dead tree
  • trees with leaves may come into contact with the overhead line
22
Q

Factors to consider when using ladders adjacent to overhead lines may include:

A
  • do not use metal ladders
  • wet/dirt on wooden ladders increase conductivity
  • fiber glass ladders may offer better protection but they’re not rated as insulated
  • always carry in a horizontal position as close to the ground as possible
  • never allow ladders to enter the vicinity zone
  • ladders must be of a type/ construction approved by the network operator and only used in accordance with permitted procedures
23
Q

Safety considerations when using ropes adjacent to overhead lines:

A
  • rope material as no ropes are rated as insulated
  • wet ropes increase conductivity
  • dirty ropes increase conductivity
24
Q

Ways to reduce the danger when working with ropes near to overhead lines:

A
  • ropes should only be placed in trees using insulated rods
  • never use lines/ throw bags
  • never throw ropes from the ground
  • all ropes in use must be secured so they don’t enter the vicinity zone
  • all ropes used climbing must be used the side of the tree furthest from the line
25
Q

Actions to be taken in the event of an emergency in the work place may include:

A
  • stop work
  • assess the situation
  • do NOT endanger yourself or other people
  • inform first aiders
  • follow emergency procedures
  • contact emergency services
  • contact the network operator/land owner
  • inform supervisor
26
Q

Emergency equipment required on site may include:

A
  • sat phone
  • first aid kit
  • fire extinguisher
  • spill kit
  • rescue equipment
27
Q

The action to take when rescuing a person from a LV line is:

A
  • consider pulling the persons or conductors clear using approved insulated rods minimum of 3x 1.2m sections
28
Q

The action to take when rescuing a person from a HV line is:

A
  • no attempt should be made to rescue the person if they are in contact with a HV line
  • the circuit may also re-close and there will be a voltage gradient in the ground
  • only approach a casualty after the overhead line has been proven dead and earthed by the network operator

Arboriculture Basic Electrical Knowledge (1 decks)

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