Ergonomics
tech guide & how tos..
| Sl. No. | Item | Standards |
|---|---|---|
| 01 | Width of stair | 900 mm (minimum) |
| 02 | Slope Angle (pitch) | 30-37 degree to horizontal |
| 03 | Effective free going of on stair | > 250 mm and constant at each step |
| 04 | Riser | < 190 mm and constant at each step |
| 05 | Railing | a) All stairs having > 4 Risers to have railings at open side b) Height of railing at 840 mm with intermediate railing at 600 mm c) Toe guard of 100 mm height at railing side |
| 06 | Landing Platform | a) At a height of maximum 3.7 meter b) Headroom of at least 2.2 meter vertically c) Width of landing to be same as width of stair |
| 07 | Tread | a)Minimum 230 mm width with a non slip nosing of 25 mm. |
1. Material of Staircase: Fire resistance material
2. Illumination level: 30 to 50 lux
3. Steps: Non slippery
| Task | Visual Requirements | Motor Input Requirements | Continuity of Requirements |
|---|---|---|---|
| Data Entry | High (source & screen) | High (keyboard) | Few Interruptions |
| Data Acquisition | High (screen) | Medium (keyboard) | Varies |
| Word processing | High to medium (source, screen & keyboard) | High (keyboard) | Few Interruptions |
| Interactive communication | Medium (screen) | Medium | Varies |
| CAD | High (screen & source) | Low | Frequent interruptions |
| Object | First Strategy | Second Strategy | Third strategy | |
|---|---|---|---|---|
| All adjustable | Support for keyboard fixed. All other adjustable | Seat fixed, all other adjustable | ||
| 1. | Seat Pan | 37-50 | 50-55 | Fixed at 50 |
| 2. | Support surface for keyboard or other data entry device | 53-70 | Fixed at 70 | 65-70 |
| 3. | Centre of display | 93-122 | 106-127 | 106-122 |
| 4. | Foot rest | Not needed | 0-18 | 0-13 |
All dimensions in Centimeter
| United States | Europe | |
|---|---|---|
| Lighting | IES Handbook, Illumination Engineering society (IES) of North America |
|
| Noise |
|
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| Climate |
| ISO Publications. e.g. ISO 7243 (1982) BSI publications (reactions to surface temperatures) |
| Manual Handling |
| University of Surrey, U.K. Force Limits in Manual Work European Community (EC) Directive on manual handling (19910 HSC (Health & safety Commission, U.K). Proposals for Regulation and guidance, 1992 |
| Seating/VDTs | ANS/ HFS 100-1988 National Standard for Human Factors Engineering of VDT Workstations | EC directive on Work with Display Screen Euipment,1990 HSC Proposals for Regulation and Guidance, 1992 |
| Anthropometry | NASA Anthropometric Source Book | Pheasant, 1986 |
| CTDs | ANSI Z365 |
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Rajeev Kumar is the primary author of How2Lab. He is a B.Tech. from IIT Kanpur with several years of experience in IT education and Software development. He has taught a wide spectrum of people including fresh young talents, students of premier engineering colleges & management institutes, and IT professionals.
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