Electrical Inspection and Testing C&G 2391 Module 2 Initial

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Electrical Inspection and Testing CG 2391

• Module 2
• Initial Verification

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Initial Verification 711-01-01

• Every installation shall, during erection and on
  completion before being put into service be
  inspected and tested to verify , so far as is
  reasonably practicable that the requirements of
  the Regulations have been met.
• Precautions shall be taken to avoid danger to
  persons and damage to property and installed
  equipment during the inspection and testing

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Avoid Danger to Persons

• Have you checked to see if any essential services
  are supplied from the board e.g emergency
  lighting,
• fire alarms, life-support equipment, UPS
  systems,
• gas monitoring systems, etc.
• Have you isolated the circuit correctly
• Have you discharged any capacitors
• Is the test equipment appropriate for the
  environment e.g intrinsically safe
• Are you using long test leads that could cause
  people to trip over
• Have you informed people of the dangers

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Avoid Damage to Property

• Is there an RCD in the circuit
• Are there computers on line
• Is there electronic equipment in the circuit
• Could gaskets be damaged when removing covers
• Are all the loads disconnected
• Is there any equipment or processes which may be
  damaged if disconnected for long periods of time
• Is there any essential equipment which cannot be
  turned off

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HSE Guidance Note GS38Approved Voltage Tester

• Adequate insulation
• Have coloured leads to distinguish one lead from
  the other
• Have finger barriers
• Maximum of 2mm exposed probe
• Flexible and Robust
• Sheathed leads to prevent damage
• Long enough for their purpose
• No accessible parts even if the lead is loose
• Have fused leads

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HSE Guidance Note GS38
Approved Voltage Tester
Sheathed
Fused leads
Finger guards
Note If the instrument does not have a built in
test facility a proving unit will be required
Colour identified
Max 2mm tip
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International Protection Code

• First Column
  Indicated by number protection against
  ingress of solid foreign bodies
• Second Column
  Indicated by number protection against
  ingress of water
• Third Column
  Indicated by letter protection offered
  to a person against contact with a dangerous part
  within an enclosure

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Third Column

• A The back of the hand is protected against
  touching dangerous parts within an enclosure
• B A finger (12mm x 80mm) is protected against
  touching dangerous parts
• C A tool (2.5mm x 10mm) is protected against
  touching dangerous parts
• D A piece of wire (1.00mm2 x 100mm) is protected
  against touching live parts

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Examples

• IP2X Full penetration of 12.5mm dia sphere
  not allowed and protection against finger
  (12mm x 80mm)
• IPXXB Protection against finger contact only
  i.e (12mm x 80mm)
• IP4X Protection against solid objects (tools,
  wires 1.00mm dia)
• IPX8 Indefinite immersion shall not allow
  water to enter the enclosure
• i.e submersion

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Information Required for Initial Verification
711-01-02

• Maximum Demand of the installation
• Number and type of live conductors
• Type of Earthing arrangements
• Nominal Voltage
• The nature of the current and the frequency
• Prospective fault current at the origin
• External phase to earth loop impedance Ze
• Suitability of the supply for the installation
• Type and nominal rating of the overcurrent device
  at the origin

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• Diagrams, charts or tables providing adequate
  information relating to the type and composition
  of each circuit including points served, type of
  wiring and the number and size of the circuit
  conductors
• Information regarding the identification and
  location of isolation and switching devices
• Identification of any circuit and/or equipment
  liable to damage by a typical test
• Identification of the method used for and means
  of compliance with Reg 413-02-04

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Inspection 712-01-01

• Inspection shall precede testing and shall
  normally be done with that part of the
  installation under inspection disconnected from
  the supply

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Inspection 712-01-02

• The inspection shall be made to verify that the
  installed electrical equipment is
• In compliance with Section 511 (this may be
  ascertained by mark or by certification furnished
  by the installer or by the manufacturer), and
• Correctly selected and erected in accordance with
  the Regulations, and
• Not visibly damaged or defective so as to impair
  safety

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Inspection Checklist 712-01-03

• Connection of conductors
• Identification of conductors
• Routing of cables in safe zones or protection
  against mechanical damage, in compliance with
  Section 522
• Selection of conductors for current-carrying
  capacity and voltage drop, in accordance with the
  design
• Connection of single pole devices for protection
  or switching in phase conductors only

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• Correct connection of accessories and equipment
• Presence of fire barriers, suitable seals and
  protection against thermal effects
• Methods of protection against electric shock
  (a)protection against both direct and indirect
  contact, i.e SELV or limitation of energy
• (b)protection against direct contact
  protection by insulation of live parts
  protection by a barrier or an enclosure
  protection by obstacles
  protection by placing out of reach
  protection by PELV
  

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• (c) protection against indirect contact
  Earthed Equipotential Bonding and Automatic
  Disconnection of Supply
• presence of earthing conductors
• presence of protective conductors
• presence of main equipotential bonding
  conductors
  
• presence of supplementary equipotential bonding
  conductors
• presence of earthing arrangements for combined
  protective and functional purposes

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• Use of Class II equipment or equivalent
  insulation
• Non-conducting locations
  absence of protective conductors
• Earth free-local equipotential bonding
  presence of earth-free equipotential bonding
  conductors
• Electrical separation

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• Prevention of mutual detrimental influences
• Presence of appropriate devices for isolation and
  switching correctly located
• Presence of undervoltage protective devices
• Choice and setting of protective and monitoring
  devices (indirect contact and/or overcurrent)
• Labelling of protective devices, switches and
  terminals
• Selection of equipment and protective measures
  appropriate to external influences

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• Adequacy of access to switchgear and equipment
• Presence of danger notices and other warning
  signs
• Presence of diagrams, instructions and similar
  information
• Erection methods

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Conduit

• Fixings (correct number and type of saddle)
• Ends of tube reamed
• Couplings tightened
• Running couplings locknuts tightened
• Box lids fitted complete with screws
• Vice marks removed
• Damaged finishes restored
• External protective conductors installed

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(1)Regarding the Initial verification of a NEW
installationState the documentation that(a)
Should be available(b) Will need to be completed

• (a) Charts / diagrams or similar information
  regarding the type of circuit, the number of
  points served, type of wiring and conductor size
  etc.
• b) i)Inspection schedule
• ii)Test results schedule
• iii)Electrical installation certificate

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(2) State(a) TWO statutory documents that have
a direct influence upon inspection and
testing(b) The legal status of HSE GS38 document
on electrical test equipment for electricians

• (a) Health and Safety at Work Act and the
  Electricity at Work Regulations
• (b) This is a Guidance note and therefore cannot
  be statutory i.e
  Non-Statutory

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(3) State THREE methods of protection against
direct contact

• There are FOUR methods of protection against
  direct contact stated in BS7671
• Insulation of LIVE parts
• Barriers or Enclosures
• Use of Obstacles
• Placing out of reach
• Any three of these would be acceptable

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(4) State three human senses that could be used
during an inspection of an installation

• All of the senses could be used-
• Sight,
• Smell,
• Hearing,
• Touch (give examples) Some smells taste

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(5) State THREE methods of protection against
indirect contact

• There are FIVE methods of protection against
  indirect contact listed in BS7671
• EEBADS (Earthed Equipotential Bonding and
  Automatic Disconnection of Supply)
• Protection by Class II Equipment
• Protection by non-conducting location
• Protection by earth-free local equipotential
  bonding
• Protection by electrical separation
• Any three will be acceptable

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(6) With reference to the Electricity at Work
Regulations State-(a) Title of the person who
has control of an electrical installation(b)
Status of the person identified above(c)
Responsibilities of this person when carrying out
the inspection and testing

• Duty Holder
• Competent
• Carry out the work safely, no danger or injury to
  persons or livestock and no damage to equipment

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(7) State three requirements of the Electricity
at Work Regulations regarding test instruments
Equipment must be Constructed, Maintained and
Used in a way to prevent danger
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(8) State the three general requirements to which
the installed equipment must conform when
carrying out an initial inspection

• The equipment is in compliance with standards
  i.e. To the correct BS or BSEN
• Correctly selected and erected in accordance
  with BS7671
• It is not visibly damaged

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• (9) State the legal status of each of the
  following-
• BS7671
• The On Site Guide
• The Electricity at Work Regulations

• Non-Statutory
• Non-Statutory
• Statutory

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(10) List three requirements of GS38 regarding
the construction of an approved test lamp

• Fused leads
• Maximum of 2mm exposed tip
• Finger guards

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(11) a) Within the code IP2X what is represented
by i) 2 ii) X b) State the level of
protection offered by IP4X

• i) standard finger 80mm long x 12mm diameter and
• no penetration by 12.5mm diameter sphere
• ii) unspecified regarding the protection
  provided
• b) Protection against small items 1.0mm diameter

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• (12) State the form of protection provided by-
• Insulation of live parts
• SELV

• Protection against DIRECT contact
• Protection against both Direct and Indirect
  contact

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• (13) State-
• The meaning of
• i) EEBADS
• ii) Indirect contact
• b) One other method of protection against
  indirect contact

a) i) Earthed Equipotential Bonding and
Automatic Disconnection of supply ii)
Contact with parts made live by a fault, b) Any
of the other four e.g. Class II Equipment
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(14) BS7671 gives a list of items to be checked,
where relevant, during an initial inspection.
List three of these.
There are 18 items listed in the inspection check
list of 712-01-02, any three of these would
do e.g.- Connection of conductors Identification
of conductors Routing of cables in safe
zones Selection of conductors for current
carrying capacity Connection of single pole
devices in phase conductor only Correct
connection of accessories. etc
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• (15) State
• When an initial inspection and test should be
  carried out
• The precautions to be taken during an inspection
  and test

• During and on completion, before being put into
  service
• Avoid danger to persons, livestock and damage to
  property