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Safety Rules > Rules 1,2,3,6,7,8 mixture > Flashcards

Rules 1,2,3,6,7,8 mixture Flashcards

1
Q

What is rule 1

A
  • Application of rules
  • safety rules shall be applied when working on or near to items of equipment which are part of a system
  • equipment shall be added and removed as in accordance with a management procedure.

Management procedure - NSI 33 (add/remove of equipment to/from the system)

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2
Q

What is rule 2

A
  • approach to exposed HV conductors and insulators
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3
Q

What is rules 2.1

A

No body or object shall approach within specified safety distances to exposed HV conductors / insulators.

  • unless live line working and rule 2.2 or rule 2.3
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4
Q

What is rule 2.2

A

Only objects permitted to encroach safety distance ( within zone established points of isolation)

  • voltage type measuring devices

And

  • earthing devices and associated application device.
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5
Q

What is rule 2.3a

A
  • POI’s established
  • danger excluded by earthing
  • encroachment is permitted under an appropriate safety document
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6
Q

What is rule 2.3b

A

Encroachment permitted within safety distance without a document

  1. POI established for equipment in interlock cages Not RP to maintain safety distance.
    - individuals may encroach no closer than 1 metre from exposed HV conductors for application/removal of (TRD)type registered devices ( R2.2)
  2. POI established in indoor 132kv subs Where not RP to maintain safety distance with zone.
    - within the zone individuals may encroach to apply/remove TRD to the bus bar isolators, bus coupler and bus section isolators.
    - providing HV conductor to be approached is earth via a fully rated earthing device.
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7
Q

What is rule 2.4

A 
Safety distances
Up to 33 - 0.8m
66kv - 1 m
132kv - 1.4m
275kv- 2.4m
400kv - 3.1m
  • 300mm to be maintained from the part of insulators supporting exposed unearthed HV conductor which are outside specified safety distance.
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8
Q

What is rule 3

A

Safety precautions Work on or near to HV equipment

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9
Q

What is rule 3.1

A
  • work carried out on Or near to HV equipment
  • SAP assesses the means of achieving safety from the system (SFTS)
  • SFTS achieved by limiting scope of work or work area, Instructions clearly defining limitations shall be given.
  • if SAP decides it necessary to confirm the instruction in writing, he shall consider a LAC.
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10
Q

What is rule 3.2

A

When SFTS can’t be achieved by limitation following apply.

  • HV equipment ID by planning process / SAP & CP (O) 1 shall prepare and release from operational service
  • CP (O) 1 pass to CPS (S) 1 via SSC
  • CP(s)1 shall ensure equipment is isolated and POI established for work and where practicable locked.
  • PE’s shall be applied within zone established by POI’s. WRP PE’s shall be locked.
  • Modern GIS kit has combined isolation/earth switch, means PE may be applied within an isolated zone before POI established.
  • contents adjusted to a level to avoid danger. If drain valves exists the SWP be locked.
  • HV equipment shall be vented and locked WRP, if danger could arise from pressurisation.
  • HV equipment shall be purged of dangerous contents if internal access is required. Equipment shall be restored to atmosphere when purging is complete.
  • when danger could arise from released stores energy, action shall be taken to contain equalise or dissipate this energy safely.
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11
Q

What is rule 3.3

A

Where work doesn’t require earths removed issue a PFW.

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12
Q

What’s is rule 3.4

A

Where working on HV equipment and it’s essential to ROMP for approved work whist PFW out.

A - approve ROMP procedure shall be used, specifying requirements to maintain SFTS

B - no other HV documents to be in force on same equipment.

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13
Q

What is rule 3.5

A

When HV earths require removal of PE’s SFW shall be issued.

  • providing SFTS maintained precautions shall be applied.
  • PE’s to be removed shall be identified
  • essential supplies which may be restored to enable work shall be defined using ROMP procedure
  • work carried out to approved SFW procedure NSI 9
  • no other HV document shall exist within the same isolated zone unless under approved procedure.
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14
Q

What is rule 6

A

The operation of equipment shall never involve pre- arranged signals or use of time intervals.

Acceptable for operational switching

E.g - if a POI is to be create in the tomorrow morning 6am on L23,in readiness for a PFW issue. CP (O) can issue instructions to maintain voltage control.

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15
Q

What is rule 7

A

Demarcation of work areas - NSI 6

Work shall be clearly defined and where necessary physically protected to prevent danger to individuals in the area from system hazards

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16
Q

What is rule 8

A

Identification of equipment

  • work shall only be permitted to start on equipment that is readily identifiable.
  • if necessary temporary labels shall be fixed to the equipment for duration of the job
  • SAP responsibility

Safety Rules (16 decks)

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