National Building Code 2005; Review

Views:
 
Category: Education
     
 

Presentation Description

Review of the Electrical section of the National Building Code 2005; With suggestions received and need for consolidation of some portions from different sections for the sake of ease of application by Bhavani Prasad, Convener Electrical Section, NBC 2005

Comments

By: dineshidse (44 month(s) ago)

excellent presentation! very educative dinesh

Presentation Transcript

National Building Code : 

National Building Code UpdateSome thoughts on the Services IEI/BIS review of NBC2005 on June 19, 2006 What we set out to do? What have we achieved? What needs to be done?

Need for Update : 

IEI/BIS review of NBC2005 on June 19, 2006 2/42 Need for Update The Construction activity has changed very much during the past twenty years. Particularly in the field of Electrical & Mechanical Services the change over the years has been enormous. Developments in communication, computers has been fast & in jumps Security, Safety & Health requirements are becoming more & more important.

COMMENTS/NOTE : 

IEI/BIS review of NBC2005 on June 19, 2006 3/42 COMMENTS/NOTE The presentation which was prepared for a similar workshop held IEI DelhiSC, has been used as the base to discuss & additional slides have been inserted. Additional slides are in a different color on the screen; But the print version that may be distributed may not be in color; So the new slides carry the text in italics.

Change In Outlook : 

IEI/BIS review of NBC2005 on June 19, 2006 4/42 Change In Outlook Look at Building as a whole with all Elements, Materials, Equipment, Operational Life Cost, Efficient Life by Maintenance & Maintainability, Energy Efficiency, Health & Safety, Lessons Learnt From Past Success & Failures Cater to the needs of the user

Status in NBC 2005 Part 8 Section 2 : 

IEI/BIS review of NBC2005 on June 19, 2006 5/42 Status in NBC 2005 Part 8 Section 2 Revisions keeping in view Adoptability/Adaptability SubstationsLocated within main building to be free of oil Can be located in upper floors Inter equipment fire barriers not required with oil free equipment Can be located in first basement, with automatic fire extinguishing systems If located in separate service building can have equipment with oil

Status in NBC 2005 Part 8 Section 2 : 

IEI/BIS review of NBC2005 on June 19, 2006 6/42 Status in NBC 2005 Part 8 Section 2 Busbar Trunkingas a means of total reduction of combustible material in the electrical system Suggestions for load estimation/ diversity included Guidelines on switchgear by reference to standards Recommends full size neutral in distribution system, to cater to the effect of non linear loads & resultant harmonics.

Status in NBC 2005 Part 8 Section 2 : 

IEI/BIS review of NBC2005 on June 19, 2006 7/42 Status in NBC 2005 Part 8 Section 2 Some items to be phased out such as Hinged type boards, open switch boards, retained with a note for phase out ---- need of adoptability Use of MCB & MCCB & undesirability of rewirable fuses Earthing need clearly mentioned Inspection schedule, testing and recommended pre-commissioning insulation values Lightning protection updated

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 8/42 Status in NBC 2005 Electrical Installations cover all systems Electrical Part 8 Section 2 Lighting & Ventilation Part 8 Section 1 HVAC Part 8 Section 3 Lift & Escalators Part 8 Section 5 Fire Safety Part 4 Water Supply & Waste Disposal Part 9 Inclusion of the associated provisions for electrical equipment of the system makes system design more meaningful and complete.

Provisions for Electrical in Part 4 : 

IEI/BIS review of NBC2005 on June 19, 2006 9/42 Provisions for Electrical in Part 4 Evacuation Facilities under abnormal conditions Exit Path Lighting Distinct illumination at Lift Lobby, Fire call points, change of direction, equipment installation points Signs & Illumination Circuit Segregation Connection for emergency from neighbors Control Switch grouping for staircase Emergency Lighting to run for 90 min Separate conduits to carry wiring for Lifts, Pumps, Corridor, staircase, lift lobby.

Provisions for Electrical in Part 4 : 

IEI/BIS review of NBC2005 on June 19, 2006 10/42 Provisions for Electrical in Part 4 Separate ducts for power to systems which are to run under abnormal conditions. -- How & what to do is not defined! 2 hrs fire rating for inspection panel doors, electrical shaft doors etc., Cable & Busbar systems to have fire stops Vertical & Horizontal for compartment integrity maintenance Substation to have separate source of power supply (other than the one it controls) Shafts to be separated from staircase or any exit path

Provisions for Electrical in Part 8 Section 1; Lighting & Ventilation : 

IEI/BIS review of NBC2005 on June 19, 2006 11/42 Provisions for Electrical in Part 8 Section 1; Lighting & Ventilation Illumination levels, energy efficiency, daylight integration, architectural design for daylight induction. Switch & circuit grouping to effect merging with daylight Recommendation of choice of lighting type

Guiding Factors : 

IEI/BIS review of NBC2005 on June 19, 2006 12/42 Guiding Factors Energy Environment Customer Service Orientation Health & Safety Standardization across the country Unification of bye-laws Guidance to cover not just clearances, but also impact on energy & environment Impact on the neighborhood

Status of Update : 

IEI/BIS review of NBC2005 on June 19, 2006 13/42 Status of Update NBC 2005: Based on current Construction activity status. Particularly in the field of Electrical & Mechanical Services the obsolete systems have removed in general & current practices are introduced. Developments in communication, computers has been fast & in jumps; NBC committee with DIT has recently been set up Security, Safety & Health requirements are have been covered to a large extent.

Change over the years : 

IEI/BIS review of NBC2005 on June 19, 2006 14/42 Change over the years Proliferation of the electrical and electronic gadgets both in the house and in the office Improved quality of life, improved communication between individuals and have contributed to a significant change in the performance of organizations. These gadgets enhance the output of individuals and organizations.

Change over the years : 

IEI/BIS review of NBC2005 on June 19, 2006 15/42 Change over the years Installation of the services has undergone a change. Many of the methods listed in the NBC 1983 are today obsolete. The energy cost has also been responsible for the change in outlook for the electrical, mechanical and electronic equipment that goes into a building.

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 16/42 Status in NBC 2005 In Electrical & Mechanical Services the obsolete systems have been removed in general & current practices are introduced. Need to augment details on Small standby Generators, UPS & Invertors. Electrical Safety – safety from shock, guidance on location of switches are required.

Change over the years : 

IEI/BIS review of NBC2005 on June 19, 2006 17/42 Change over the years Energy costs have also brought in a change in the outlook of the architectural design of buildings. We cannot afford to overlook the operating cost of the building as a whole. Closely associated with the energy are the environmental factors associated with energy usage.

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 18/42 Status in NBC 2005 Simultaneous development of Code for Energy Conservation in Buildings by Bureau of Energy Efficiency, required NBC to keep off that area. Environmental regulations for control of (1) noise and (2) exhaust emission and methods to achieve them would be a necessary addition Electrical controls – remote control, group control, sensor based controls would be welcome. Energy Storage – different forms & cost effective applications to be added.

Energy & Environment : 

IEI/BIS review of NBC2005 on June 19, 2006 19/42 Energy & Environment Global Warming which was considered to be a distant dream of a pessimistic scientist is now identified to be a reality staring at us. Energy consumption is directly associated with the production of green house gasses and global warming. We cannot afford to face the consequences on the environment

Building & Energy : 

IEI/BIS review of NBC2005 on June 19, 2006 20/42 Building & Energy Our building designs should keep energy in all its forms and stages of utilization Energy that goes into the formation of the building materials. Energy that is utilized in the construction. Energy that will be spent during the life time of the building.

Speed of Construction & Maintainability : 

IEI/BIS review of NBC2005 on June 19, 2006 21/42 Speed of Construction & Maintainability The speed of construction has also been assuming importance. Speed of construction is dependent on the method adopted and the type of structure. Maintainability is another aspect which has not been addressed in the Code. Today with the gradual but continuous increase in the labor costs it is essential that the design is such that the requirements of resources are kept to the minimum.

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 22/42 Status in NBC 2005 Construction speed – correlation with methods could be brought out. Maintenance is another area, which has become very complex. Code should cover maintenance methods, inspection frequency, standards to evaluate on replacement of obsolete components. Standards for component life.

Requirement Today : 

IEI/BIS review of NBC2005 on June 19, 2006 23/42 Requirement Today Architectural Design with emphasis on insulation, daylight utilization, natural ventilation, shielding, acoustics, window area & disposition, glazing. Structural Design including environmental factors such as weather, earthquake etc.,. Material selection & Equipment Selection as part of the basic design process. Lighting Design again has to be an integrated design effort with day lighting and artificial lighting being given a collective treatment.

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 24/42 Status in NBC 2005 Integrated approach to Design & Construction has been emphasized. Content and chapters in the NBC are also reasonably integrated. Lighting – Day Lighting & Artificial Lighting have been integrated in a reasonable manner. But principles of combined design require to be added.

Requirement Today : 

IEI/BIS review of NBC2005 on June 19, 2006 25/42 Requirement Today Natural Ventilation has to be integrated with controlled Heating, Ventilation & Air Conditioning and should cover assisted & natural ventilation, where relevant and should also cover the overall energy aspects in the context of heat inflow associated with daylight induction. Lighting & Ventilation for safety & health aspects should be covered as an essentiality.

Requirement Today : 

IEI/BIS review of NBC2005 on June 19, 2006 26/42 Requirement Today Acoustics is another area which today in general is attended to only in the case of auditorium or conference hall etc. Aspects such as traffic noise, its shielding are also to be covered. Acoustic separation of adjoining rooms, in particular between rooms for discussions and work rooms in adjoining spaces is also in important environmental factor which should be covered in the design schemes.

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 27/42 Status in NBC 2005 Today we have far more people working round the clock. Apart from Industrial factories more are working in IT & ITES. Lighting & exposure to day light, temperature & humidity control, acoustics and controlled variation of these parameters during the shift period are today considered essential. To adopt them we have to put them in the codes. Environmental aspects of disposal from construction, operation & maintenance aspects and proper disposal or recycling can be added.

Electrical : 

IEI/BIS review of NBC2005 on June 19, 2006 28/42 Electrical Wiring systems in the present code have become obsolete and are better dispensed with. Use of a large number of gadgets the need for socket outlets has increased. Gadgets which consume non-linear current & reflect harmonics on to the system have also increased. As a result the distribution system associated with has also undergone a change.

Electrical : 

IEI/BIS review of NBC2005 on June 19, 2006 29/42 Electrical Distribution system changes have also come up due to the changes in the fault energy feed. Fuses have generally been replaced by Miniature Circuit Breakers, Molded Case Circuit Breakers. Air Circuit breakers at medium voltages and Vacuum as well as SF6 circuit breakers at higher voltages.

Electrical : 

IEI/BIS review of NBC2005 on June 19, 2006 30/42 Electrical Fire hazard associated with the power transformation has let us to change over to oil free switch gear and transformers. Cable based distribution systems have given way to Busbar & Compact Busbar based systems reducing the combustible material and also enhancing the reliability, while reducing the maintenance effort.

Electrical : 

IEI/BIS review of NBC2005 on June 19, 2006 31/42 Electrical Dry type transformers are becoming common and are also being installed in upper floors. Increased cost of labor have led to system design and component selection with long service life. Energy considerations and technology have brought in a whole set of new control devices. Remote control switches for lights fans etc., based on infra red or radio frequency Passive infra red movement detector Light sensitive switching devices Central control systems based on computer & Lan

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 32/42 Status in NBC 2005 New systems of distribution – busbar standard & compact trunking are now included. Recommendations for use fire survival cable system to feed services required to remain in service even in the event of an abnormal condition are to be added. Provision for connection from the neighbor's property for emergency power requirements could be added.

Drivers for the Change : 

IEI/BIS review of NBC2005 on June 19, 2006 33/42 Drivers for the Change Changes driven by energy, environment and fire have been made possible by a major change in the technology. Standards for most of the power equipment have also been standardized and many of them have been harmonized with IEC standards Benchmark for energy consumption or energy efficiency of equipment are to be established and incorporated.

Allied Systems:Communication : 

IEI/BIS review of NBC2005 on June 19, 2006 34/42 Allied Systems:Communication Telephone System, PABX, Cordless (WLL) Systems Intercom, Paging, General Announcement System Data Communication Local Area Network, VoIP Satellite, VSAT, Dish Antennae Hard wired networks Copper - UTP, Co-Axial Optical Multiplexed network cabling systems Wireless Networking Infra red networks Radio Frequency Networks

Security & Access Control : 

IEI/BIS review of NBC2005 on June 19, 2006 35/42 Security & Access Control Access to & within buildings for persons Vehicular access, Parking Control CCTV Surveillance Movement Detection & linkage to Access, CCTV, Air Conditioning, Lighting etc., Announcement Systems Emergency Announcements under conditions of fire etc., Operational announcements, Functional announcements, Soft Music distribution Exit Signs and Escape route marking & lighting

Status in NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 36/42 Status in NBC 2005 Power consumption benchmarks from ECCB (BEE) can be incorporated. Green Building concepts, evaluation in Indian conditions & related design, recycle, construction practices can be added. BIS & DIT are working on Data & Voice communication systems. Surveillance, Security & Access Control systems are common features of buildings. NBC should cover these in greater detail. Non Conventional Energy sources & their integration with building elements.

Non Conventional Energy Applications : 

IEI/BIS review of NBC2005 on June 19, 2006 37/42 Non Conventional Energy Applications Non Conventional energy today appears to be expensive; But for many applications where a high quality of power is required it could work out to be cost effective, as most of the non conventional energy systems such as Solar Photo voltaic Systems, Solar Hot water Systems, have very high reliability. For an escape route & exit sign system or a computer system requiring a UPS, SPV system is a fair cost effective competitor.

Mechanical Systems : 

IEI/BIS review of NBC2005 on June 19, 2006 38/42 Mechanical Systems Ventilation & Evaporative Cooling Vertical Transportation Systems (Lifts or Elevators) Standby Diesel Generating Sets Water Pumping Systems Sewage Pumping & Aeration Systems Air Conditioning, Heating & Refrigeration Wet Riser Sprinkler De-Watering Travellators Escalators

Air Conditioning : 

IEI/BIS review of NBC2005 on June 19, 2006 39/42 Air Conditioning Air Conditioning highly energy intensive (electrical, absorption, mechanical compression) type of energy source used (Electricity or Fuel) type of compressor (reciprocating, centrifugal, screw, scroll), type of refrigerant (R-11, R-12, R-22, R-123, R-134a, R-407, Water, Ammonia) The choice of refrigerant is influenced by the Ozone depletion potential. Refrigerant choice is also governed by the energy efficiency and energy consumption affects global warming. Ammonia & Water based systems which are environment friendly give certain other problems.

Air Conditioning : 

IEI/BIS review of NBC2005 on June 19, 2006 40/42 Air Conditioning Air distribution and control can have alternatives (AHU, Fan Coil, High pressure air, Constant volume, Variable air volume). Integration of controls of the air distribution systems with the fire detection and alarm system as well as smoke extraction systems are essential in large air conditioned buildings. Heating and De-humidification can also have alternatives such as electrical strip heaters, hot water system based on either electricity or fuel. R-11, R-12 are CFCs are most objectionable, R-22, R-123 are HCFCs which are less damaging and the others are least damaging from the aspect of Ozone Hole.

Architecture & Air Conditioning : 

IEI/BIS review of NBC2005 on June 19, 2006 41/42 Architecture & Air Conditioning Integration of architectural design aspects such as shading, use solar passive elements, daylight, use of glass, thermal insulation Reduces solar load or heat gain, which will ultimately reduce the air conditioning load and thereby energy consumption. With the growing pressure on urban space and construction restrictions in bye laws, air conditioning water chilling or direct expansion plants of sizes upto 240 TR are being installed on the terrace

BAS, DG Sets, & Physiological Aspects : 

IEI/BIS review of NBC2005 on June 19, 2006 42/42 BAS, DG Sets, & Physiological Aspects Standby Diesel Generating Sets Building Automation System Monitoring the operation of all types of equipment covering power system, lifts, air conditioning, water supply, sewage disposal & treatment, lighting, access control, fire detection etc., Recent research indicates that the human body does require a rhythmic variation of temperature and light.

Fire Protection & Detection : 

IEI/BIS review of NBC2005 on June 19, 2006 43/42 Fire Protection & Detection While the separate section for Fire Related Systems exists, the design of electrical systems & communication systems have to be covered with the particular aspects of continued performance of the essential services even in the event of an abnormality in a small portion or compartment of the building.

Installation Practices & Safety : 

IEI/BIS review of NBC2005 on June 19, 2006 44/42 Installation Practices & Safety Today the training of the architects has changed and the general needs and the restrictions imposed are reasonably well known to qualified architects and they take them up from the concept stage itself. Without proper provision for services and good maintainability, the overall operational cost of the building during its life shoots up and it becomes uneconomical in the long run

Complexity, Specialization, Licensing : 

IEI/BIS review of NBC2005 on June 19, 2006 45/42 Complexity, Specialization, Licensing Services equipment today has grown in complexity. builders /contractors override or neglect the safety provisions with regard to electricity rules, earthquake resistant design, lift rules Tragedies like the Uphaar Cinema, Bhuj etc., have brought these things out clearly. Code to prescribe controls for the building envelope, insulation, fenestration, air conditioning design parameters, equipment selection, lighting and daylight induction including optimization for different latitudes and longitudes, ventilation aspects, energy efficiency of equipment, motors, lighting levels, light sources, motors for other services such as pumps etc.,.

Conclusions : 

IEI/BIS review of NBC2005 on June 19, 2006 46/42 Conclusions Energy considerations are driving us towards the total integration at the design stage for sustained energy efficiency The Electrical & Allied systems have been undergoing fast technological change and the code requires to be updated on these aspects. Air conditioning systems have a very wide set of alternatives with benefits and penalties and the code has to bring out the various alternatives available with High cost of urban land is driving us to install DG Sets, Air conditioning plants etc., on the top of the buildings. While many installations have been successfully serving proper analysis and codal provisions to ensure safety have to be provided.

Conclusions : 

IEI/BIS review of NBC2005 on June 19, 2006 47/42 Conclusions Environmental considerations are also bringing emphasis on energy and also on making the buildings or building complexes to be self reliant or self sustainable, with reduced dependency on the central systems provided by the local bodies (Municipality, Electrical Distribution, Water Supply, Sewage Disposal, Communications). Building Automation systems are affordable and are a necessity today to ensure efficient operation of buildings and to provide proper maintenance.

Change In Outlook : 

IEI/BIS review of NBC2005 on June 19, 2006 48/42 Change In Outlook Standards/Code to be such that they are adoptable/adaptable Enforcement Vs Voluntary Use Dynamic – Accept changes as new techniques, equipment & materials become available Lessons Learnt From Past Success & Failures Cater to the needs of the user

Conclusions - NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 49/42 Conclusions - NBC 2005 NBC 2005 has been updated. There is need for a few more essential additions to the code. Today the changes are taking place very fast and the method or procedure for updating the code has also to undergo a change for fast response. Accessibility to the document should be improved. Web based access could be considered. Many Educational Institutions are not aware of the revised NBC.

Conclusions - NBC 2005 : 

IEI/BIS review of NBC2005 on June 19, 2006 50/42 Conclusions - NBC 2005 Dynamic updating is required Accessibility to the document should be improved. Web based access could be considered. Objective based codes should be introduced to encourage innovation, induction of new methods, materials Failure documentation on a wide scale so that we learn from our mistakes.

Next Generation of Codes : 

IEI/BIS review of NBC2005 on June 19, 2006 51/42 Next Generation of Codes Move Towards Objective-Based Codes New Code Development Process Current Code Documents 2005

Objective-Based Codes : 

Objective-Based Codes Why Objective-Based Codes? What are they? How do they work? When will they come into effect? What are the benefits? Summary Objective-Based Codes

What’s new? Functional Statements : 

IEI/BIS review of NBC2005 on June 19, 2006 53/42 What’s new? Functional Statements Each provision is linked to one or more functional statements, which: describe the conditions to be achieved in more detail than objectives do are qualitative Objective-Based Codes

What’s new? Functional Statements : 

IEI/BIS review of NBC2005 on June 19, 2006 54/42 What’s new? Functional Statements Each provision is linked to one or more functional statements, which: describe the conditions to be achieved in more detail than objectives do are qualitative Objective-Based Codes

Division A Compliance, Objectives and Functional Statements : 

IEI/BIS review of NBC2005 on June 19, 2006 55/42 Division A Compliance, Objectives and Functional Statements Table of Contents Part 1. Compliance Part 2. Objectives Part 3. Functional Statements Objective-Based Codes

Division A Compliance, Objectives and Functional Statements : 

IEI/BIS review of NBC2005 on June 19, 2006 56/42 Division A Compliance, Objectives and Functional Statements Table of Contents Part 1. Compliance Part 2. Objectives Part 3. Functional Statements Objective-Based Codes

Intent Example from the database : 

IEI/BIS review of NBC2005 on June 19, 2006 57/42 2) Interior and exterior walking surfaces that are within a barrier-free path of travel shall a) have no opening that will permit the passage of a sphere more than 13 mm diam, b) have any elongated openings oriented approximately perpendicular to the direction of travel ... Intent Example from the database NBC 3.8.1.3.(2) Intent To reduce the probability that a wheelchair or other mobility assistance device used by a person will be trapped in a walking surface, which could lead to loss of balance of the person, which could lead to harm to the person or persons nearby. Objective-Based Codes

Summary : 

IEI/BIS review of NBC2005 on June 19, 2006 58/42 Summary Objectives - are top level Functional Statements - describe conditions to be achieved Intents - give detailed reason for each specific requirement/solution in plain language Acceptable Solutions - are current and future prescriptive and performance requirements Alternative Solutions - no change in current approach for compliance with National Codes Objective-Based Codes

National Building Code 2005 : 

National Building Code 2005 Thank you IEI/BIS review of NBC2005 on June 19, 2006 What we set out to do? What have we achieved? What needs to be done?