Lighting Safety Considerations
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SEMINAR PRESENTATION ON
Lighting Safety Considerations
Presented By:
Navnath K. Magar
(20140278)
Guided By:
Dr. U. V. Patil
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Lighting and Illumination Introduction
Electrical lighting Non-Electrical lighting
1. Clean in operation 1. Dirty in operation
2. Easy to control 2. Control is difficult
3. Reliable 3. Non-reliable
4. Steady output 4. Varying output
5. High efficiency 5. Low efficiency
6. Low cost 6. High cost
7. Less hazardous 7. More hazardous
8. Low possibility of fire 8. High possibility of fire
9. e.g. Fluorescent lamp, discharge lamp 9. e.g. Candle, oil lamp, fire
• Definition of Illumination• Color of Object
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Importance of Lighting Safety Considerations.
o Improper Lighting effect:-
1. Eye irritation
2. Headache
3. Reduction in mental alertness
4. Discomfort
5. Reduction in productivity & quality of work
6. Injury to person
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Injury Trend Based On Lighting Level
Source: Lighting safety considerations by Mathew F.(IEEE Transactions on Industry Applications)
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Luminous Flux(Lumens): Total quantity of light energy radiated per second.
Illumination(Lux): Luminous flux received by a surface per unit area of surface.
Lamp efficiency(lm/w): Ratio of luminous flux to power input.
Depreciation factor: Ratio of illumination with clean lamp to illumination under working conditions.
Space to height ratio: Ratio of horizontal spacing between two lamps to the height of the lamp above working plane.
Glare
Shadow
• Terminologies
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Safety Aspects
Lighting Design:- Adequate lighting, glare & shadows, flickers
Maintenance Issues:- Re-lamping, de-energize, environmental factors
Location and Installation:-
Hazardous Locations:- Flameproof & explosion proof lighting , restricted breathing
Maintenance Ergonomics:- Static load , body postures
IE Rules
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Adequate Illumination
Over Illumination
Definition
Health Effects:-
1. Headache
2. Fatigue
3. Stress
4. Performance effect
Lighting Design
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Under illumination
Definition
Health Effects:-
1. Headache
2. Fatigue
3. Stress
4. Performance effect
• Design factors
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Glare and Shadows
Definition
Solution
Power Quality (Flickers)
Definition
Causes
Solution
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Design Procedure
1. Identify the requirements
2. Determine the method of lighting
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3. Select the lighting equipment
4. Calculate the lighting parameters and adjust the design as required
5. Determine the control system
6. Choice of luminaries
7. Inspect the installation upon completion
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Maintenance Issues Re-lamping
Frequency of re-lamping Improper servicing
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De-energize
Advantages:-
• Quick removal
• Safe and quick replacement
• Eliminating shock and burn hazards
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Environmental Factors
A. Corrosion : Alloy of Cu free Al , finishing with epoxy powder.
B. Moisture : Fixture with NEMA 4X rating.
C. Dust: Cone fixtures
LED with heat sink
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Location and installation
Frequency and accessibility at maintenance site
Space restrictions and temperature relations
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Maintenance Ergonomics Static Loads Awkward working position
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Flame proof and Explosion proof Lighting :
o Contain explosion within itself
o Escaping gases released at below ignition temp. of external area
o Heat is released through lens
o Housed in flameproof enclosures
o Made up of Non-metallic materials
Hazardous Locations
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Restricted Breathing
o Prevent entry of flammable gases
o Done by using external sealing that prevent in and out of air
o External material should bear high temperature
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Indian Standard Code for Lighting Indian Standard CODE OF PRACTICE FOR INDUSTRIAL
LIGHTING IS : 6665 – 1972
FACTORS INFLUENCING GOOD INDUSTRIAL LIGHTING PRACTICE :
A good industrial lighting should take into account:
a) adequate quantity of illumination, and
b) good quality of illumination.
o A general lighting system should be designed to provide a uniform distribution of light over the entire work area.
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o In locations where dirt will collect very rapidly on luminaries surfaces and where adequate maintenance is not available, they should maintain periodically.
• Quality of Illumination : To reduce direct glare in industrial areas, the following steps should be taken :
1. Decrease the luminance of light sources or lighting equipment, or both
2. Reduce the area of high luminance causing the glare condition
3. Increase the angle between the glare source and the line of vision
4. Increase the luminance of the area surrounding the glare source and against which it is seen.
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High reflectance surfaces are generally desirable to provide the recommended luminance relationships and high utilization of light. They also improve the appearance of the work space. It is also desirable that the background is slightly darker than the seeing task.
In uniform illumination, the distribution of light with a maximum and minimum illumination at any point should not be more than one-sixth above or below the average level in the area.
Colour discrimination and colour matching are a part of the work process, the light source selected should have the desired colour rendering properties.
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Required Illumination Level In Industry
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Conclusion
Lighting design is not simple and straight forward as one may think. It needs to start safety centered approach.
Safety is affected by the reliability , longevity and maintainability of the designed system.
End users must do their research and should
achieve the best and safest design possible.
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For your attention