hdb-supervision guide for electrical engineering works
TRANSCRIPT
Supervision Guide for Electrical Engineering
Works
Introduction
To develop quality management system and checklists / forms for supervising Electrical Engineering Works
Quality Control
Material
Timber mock up
Trades Demonstration
Sample units
In-process checking
Delivery and storage
Testing & commissioning
Handover inspection
Specific Requirement
No Drill Zone
150mm “bandwidth” to the left, right, above and below w.r.t. all conceal electrical accessory and also below ceiling
Specific Requirement
Lightning Protection System
HDB use aluminium lightning tape on the roof top and run the aluminium down conductor on surface of external wall/column.
The aluminum down conductor is connect to copper tape using bi-metallic aluminum/copper connector at a height of 2.5m. The copper tape shall be properly concealed or embedded to prevent it from being removed
Specific Requirement
TV System
All distribution amplifiers are to be properly secured with locking device and engrossed with Serial number. All Tee units in the Telecom Riser and distribution amplifiers are to be spray painted
Submission
Services coordination drawings
First Storey trunking route and penetration
Good Practices/ Common Defects
Good Practices/Common Defects
Electrical Installation
Conceal conduits should be gradually bent and has no more than 2 nos. of 90 degree bend between two points and the crossing of conduits should be kept to a minimum so that the covering of the conduit should be sufficient
Good Practices/Common Defects
Electrical Installation
Proper conduit accessories are to be used
Location of conceal conduit w.r.t. the precast component must be checked
Good Practices/Common Defects
Electrical Installation
Conceal conduit running outside the no drill zone
X
Good Practices/Common Defects
Electrical Installation
The Consultant can consider casting the socket outlets separately to ensure that the socket outlets are in level position and also reduce the need to hack the brick wall later for the installation of conduits.
For those socket outlets to be installed at the brick wall
Good Practices/Common Defects
Electrical Installation
No cable should be exposed without the protection of a conduit, trunking or some other form of protection
X
Good Practices/Common Defects
Electrical Installation
The Consultant should inspect and paid attention on the running of the conceal conduit in block walls.
In this case, metal conduit should be used
X
X
Good Practices/Common Defects
Electrical Installation
In instances where two residential units share one common riser duct, PowerGrid meter boxes should be placed logically for identification
Good Practices/Common Defects
Electrical Installation
The Consultant should check to ensure that the main door does not hit the CCU when fully opened.
X
Good Practices/Common Defects
Earth System
The Consultant should ensure all necessary information of the earth system engraved on a durable identification tag to be fixed onto the inside top of the earth pit
Good Practices/Common Defects
ELV Installation
Proper separations between Switched socket outlet box and TV outlet box
X
Good Practices/Common Defects
Lightning Protection System
Location of the aluminium air terminal should be check and relocated appropriately with consideration of the ladder or railing installed at the roof
X
Good Practices/Common Defects
Lightning Protection System
Re-entrant loop should be avoided
CONQUAS
Finishes must be even, level, align & consistent
No stain marks and visible damages / defects
Thank You
Timber Mock Up
The Consultant should inspect and verify the position of all electrical provision, esp at toilet and balcony
- heater point at toilet
- power point for the washing machine
In Process Checking
The Consultant should verify that the Electrical Sub-contractor is
- BCA registered contractor of at least L2 grade
- Registered with Qualified Electrical Contractors Registry maintained by IES/ACES