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NSD Sizing Your System

The following formula is an international draft guideline for the proper positioning and application of safety mats for machine guarding. This formula must be followed for all safety mat applications supplied to the European Community (CE) member nations. CEN is the European Committee for Standardization. Final draft #prEN999

The minimum distance from the danger zone shall be calculated by using the general formula: S=(K x T) +C where:

S is the safety mat minimum distance in inches/millimeters in a horizontal plane, from the danger zone to the detecting edge of the safety mat furthest from the danger zone.

K is a parameter in inches/millimeters per second, derived from data on approach speeds of the body or parts of the body. K=63 inches/second or 1600mm/second.

T is the total system stopping time performance in seconds, which includes activating the safety mat, the mat controller output signal switching device and the time required to stop the machine and remove risk. The activation time of the NSD Safety Mat System including controller is 35 msec (.035 seconds). This amount must be added to the machine stopping time to fulfill the "T" requirements.

C is an additional distance in inches/millimeters, based on intrusion towards the danger zone prior to actuation of the protective safety mat equipment. C=48 inches or 1219mm.

NSD Sizing Chart

Annex B (informative)
Walking speeds and stride lengths.
The positioning of equipment which is activated by a person walking into the detection zone by stepping onto a pressure sensitive mat is affected by speed of approach and stride length. The walking speed and stride length depend on the physical and anthropometric data of the population.

Speed of Approach
This standard assumes the approach of persons towards the danger zone will be at walking speed.

Stride Length
Available research data has shown the 95th percentile of two steps (i.e., starting and finishing with the same foot) measured from heel contact at walking speed is approximately 75 inches/1900 mm. By dividing by 2 and subtracting the 5th percentile shoe length, this gives a stride length of 28 inches/700 mm. If it is assumed that an allowance has to be made, for example, between the detection zone and the stride length of 2 inches/50 mm, this gives a minimum width of 30 inches/750 mm for the detection zone.

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Safety Light Curtains

◦	Safety Light Curtain Comparison
◦	Model SS Solid State Outputs Safety Light Curtain
◦	Model SS Product Overview
◦	Model SS Blanking Options
◦	Model SS Safety Relay
◦	Model SS Specs and Dimensions
◦	Model SS Ordering Procedure
◦	Model SS Accessories
◦	Model MG Metal Box Controller and Safety Light Curtain
◦	Model MG Product Overview
◦	Model MG Smart Controller
◦	Model MG Design Criteria
◦	Model MG Features
◦	Model MG Dimensions
◦	Model MG Blanking Options
◦	Model MG Ordering Procedure
◦	Model MG Accessories
◦	Model MG Ethernet Option
◦	Model DR DIN-rail Controller and Safety Light Curtain
◦	Model DR Product Overview
◦	Model DR Smart Controller
◦	Model DR Design Criteria
◦	Model DR Features
◦	Model DR Dimensions
◦	Model DR Blanking Options
◦	Model DR Ordering Procedure
◦	Model DR Accessories
◦	Model CE Solid State Outputs Global Safety Light Curtain
◦	Model CE Product Overview
◦	Model CE Blanking Options
◦	Model CE Safety Relay
◦	Model CE Specs and Dimensions
◦	Model CE Ordering Procedure
◦	Model CE Accessories
◦	Model CA Cascading Safety Light Curtain
◦	Model CA Product Overview
◦	Model CA Blanking Options
◦	Model CA Safety Relay
◦	Model CA Specs and Dimensions
◦	Model CA Ordering/Pricing Procedure
◦	Model CA Accessories
◦	Model PPG Perimeter Guarding
◦	Model PPG Product Overview
◦	Model PPG Dimensions
◦	Model PPG Ordering Procedure
◦	Model PPG Accessories

Safety Mats

Ergonomic Palm Buttons

◦	UltraTouch Product Overview
◦	What can UltraTouch do for you?
◦	UltraTouch Benefits
◦	Ergonomic Palm Button Comparison
◦	UltraTouch Specifications
◦	UltraTouch Dimensions
◦	UltraTouch Models Available
◦	UltraTouch Ordering Procedure and Finding a Part Number
◦	UltraTouch Accessories

Programmable Safety Controller

Safety Interlock Switches

◦	GKM Series
◦	GKN Series
◦	GKE Series
◦	GK Series
◦	GKR/GKL Series
◦	GSS Series
◦	1CPS Series
◦	2CPS Series
◦	FF3-21-DC-03
◦	FF5-21-DC-03
◦	FF6-10-DC-03
◦	FFS-11-03
◦	BX Series
◦	GSX Series
◦	CLSX Series

Fencing

◦	Fencing Overview
◦	Fencing Specifications
◦	Fencing Styles
◦	Complies with Safety Standards
◦	OSHA Table 0-10
◦	Fencing Warranty
◦	Proposal Request

E-Stops & Stack Lights

Metal Stamping / Pressroom Products

◦	Press Control Design Criteria
◦	Punch Press Clutch/Brake Controls
◦	Press Automation
◦	Die Protection
◦	Tonnage Monitoring
◦	Programmable Limit Switches
◦	Time-Based Brake Monitors

Safety Glossary

◦	Glossary A-C
◦	Glossary D-F
◦	Glossary G-I
◦	Glossary J-L
◦	Glossary M-O
◦	Glossary P-R
◦	Glossary S-U
◦	Glossary V-Z

Risk Assessment

Repair of Products

Corporate Profile

Standards and Regulations

◦	1910.211
◦	1910.212
◦	1910.213
◦	1910.216
◦	1910.217
◦	Appendix A
◦	Appendix B
◦	Appendix C
◦	Appendix D
◦	ISO and IEC Standards
◦	What Does OSHA Do?
◦	ANSI
◦	Domestic and International Standards Organizations
◦	OSHA Concept and Techniques of Machine Guarding

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