What ACCORD & BNBC stated about Inspection of Installation!!!

 

10.13.7 Inspection of the Installation

On completion of wiring a general inspection shall be carried out by competent personnel in order to verify that the provisions of this Standard and that of the Electricity Act of Bangladesh have been complied with.

10.13.7.1 Inspection of Substation Installations: In substation installations, it shall be checked whether:

(1) Phase to phase and phase to earth clearances are provided as required
(2) All equipment are efficiently earthed and properly connected to the required number of earth electrodes
(3) The required ground clearance to live terminals is provided
(4) Suitable fencing is provided with gate with lockable arrangements
(5) The required number of caution boards, fire-fighting equipment, operating rods, rubber mats, etc., are kept in the substation
(6) In case of indoor substation sufficient ventilation and draining arrangements are made
(7) All cable trenches have covers of non-inflammable material
(8) Free accessibility is provided for all equipment for normal operation
(9) All name plates are fixed and the equipment are fully painted
(10) All construction materials and temporary connections are removed;
(11) Oil level , bus bar tightness, transformer tap position, etc. are in order;
(12) Earth pipe troughs and cover slabs are provided for earth electrodes/earth pits and the neutral and LA earth pits are marked for easy identification;
(13) Earth electrodes are of GI pipes or CI pipes or copper plates. For earth connections, brass bolts and nuts with lead washers are provided in the pipes/plates
(14) Earth pipe troughs and oil sumps/pits are free from rubbish, dirt and stone jelly and the earth connections are visible and easily accessible
(15) HT and LT panels and switchgears are all vermin and damp- proof and all unused openings or holes are blocked properly
(16) The earth bus bars have tight connections and corrosion free joint surfaces
(17) Control switch fuses are provided at an accessible height from ground
(18) Adequate headroom is available in the transformer room for easy topping- up of oil, maintenance, etc.
(19) Safety devices, horizontal and vertical barriers, bus bar covers/shrouds, automatic safety
shutters/door interlock, handle interlock etc. are safe and in reliable operation in all panels and cubicles
(20) Clearances in the front, rear and sides of the main HT and LT and sub-switch boards are adequate
(21) The switches operate freely; the 3 blades make contact at the same time, the arcing horns contact in advance and the handles are provided with locking arrangements
(22) Insulators are free from cracks, and are clean
(23) In transformers, there is no oil leak
(24) Connections to bushing in transformers are light and maintain good contact;
(25) Bushings are free from cracks and are clean
(26) Accessories of transformers like breathers, vent pipe, buchholz relay, etc. are in order
(27) Connections to gas relay in transformers are in order
(28) In transformers, oil and winding temperature are set for specific requirements to pump out
(29) In case of cable cellars, adequate arrangements exist to pump off water that has entered due to seepage or other reasons

(30) All incoming and outgoing circuits of HT and LT panels are clearly and indelibly labeled for identifications.

10.13.7.2 Inspection of Medium Voltage Installation: In Medium Voltage (MV) Installations, it shall be checked whether:

(1) All blocking materials that are used for safe transportation in switchgears, contactors, relays, etc. are removed
(2) All connections to the earthing system have provisions for periodical inspection
(3) Sharp cable bends are avoided and cables are taken in a smooth manner in the trenches or alongside the walls and ceilings using suitable support clamps at regular intervals
(4) Suitable linked switch or circuit breaker or lockable push button is provided near the motors/apparatus for controlling supply to the motor/apparatus in an easily accessible location
(5) Two separate and distinct earth connections are provided for the motor apparatus
(6) Control switch fuse is provided at an accessible height from ground for controlling supply to overhead traveling crane, hoists, overhead bus bar trunking
(7) The metal rails on which the crane travels are electrically continuous and earthed and bonding of rails and earthing at both ends are done
(8) Four-core cables are used for overhead travelling crane and portable equipment, the fourth core being used for earthing, and separate supply for lighting circuit is taken
(9) If flexible metallic hose is used for wiring to motors and other equipment, the wiring is enclosed to the full lengths, and the hose secured properly by approved means
(10) The cables are not taken through areas where they are likely to be damaged or chemically affected
(11) The screens and armors of the cables are earthed properly
(12) The belts of belt driven equipment are properly guarded
(13) Adequate precautions are taken to ensure that no live parts are so exposed as to cause danger
(14) Installed Ammeters and voltmeters work properly and are tested
(15) The relays are inspected visually by moving covers for deposits of dusts or other foreign matter.

10.13.7.3 Inspection of Overhead Lines: For overhead lines, every care must be taken so that:

(1) All conductors and apparatus including live parts thereof are inaccessible
(2) The types and size of supports are suitable for the overhead lines/conductors used and are in accordance with approved drawing and standards
(3) Clearances from ground level to the lowest conductor of overhead lines, sag conditions, etc. are in accordance with the relevant standard
(4) Where overhead lines cross the roads suitable grounded guarding shall be provided at road crossings,
(5) Where overhead lines cross each other or are in proximity with one another, suitable guarding shall
be provided at crossings to protect against possibility of the lines coming in contact with one another;
(6) Every guard wire shall be properly grounded / earthed
(7) The type, size and suitability of the guarding arrangement provided shall be adequate
(8) Stays cables must be provided suitably with the overhead line carrying poles as required and shall be efficiently earthed at the bottom and shall be provided with suitable stay insulators of appropriate voltages
(9) Anti-climbing devices and Danger Board/Caution Board Notices are provided on all HT supports
(10) Clearances along the route are checked and all obstructions such as trees/branches and shrubs are cleared on the route to the required distance on either side
(11) Clearance between the live conductor and the earthed metal parts are adequate
(12) For the service connections tapped off from the overhead lines, cutouts of adequate capacity are provided.  

10.13.7.4 Inspection of Lighting Circuits: The lighting circuits shall be checked to see whether:

(1) Wooden boxes and panels are avoided in factories for mounting the lighting boards, switch controls, etc.
(2) Neutral links are provided in double pole switch fuses which are used for lighting control, and no fuse is provided in the neutral
(3) The plug points in the lighting circuit are all 3- pin type, the third pin being suitably earthed
(4) Tamper proof interlocked switch socket and plug are used for locations easily accessible
(5) Lighting wiring in factory area is enclosed in conduit and the conduit is properly earthed, or alternatively, armored cable wiring is used
(6) A separate earth wire is run in the lighting installation to provide earthing for plug points, fixtures and equipment
(7) Proper connectors and junction boxes are used wherever joints are in conductors or cross-over of conductors takes place
(8) Cartridge fuse units are fitted with cartridge fuses only.