2 Differences between Physical and Protective Barriers For security purposes, the organizations tend to implement some form of barriers to reduce the possibility of access to the installations. The physical barriers define the boundaries to delay or prevent access. In the same case, the barrier is necessary to ensure that the person only reaches a particular area at any particular …
Sep 07, 2021 · A physical barrier to communication can be defined as an element or a physical factor that acts as a distraction to hinder the flow of communication. A physical barrier can be natural or human-made and is easy to spot. Noise, bad architecture and closed doors are all physical barriers to listening. Even a network disturbance due to a thunderstorm can be …
Aug 05, 2020 · When the movable barrier device is used as a risk reduction measure, that specific portion of the machine control function is now a safety-related part of the control systems (SRP/CS). Additionally, the measure would also meet the definition of a “safety function” (function of a machine, the malfunction of which would increase the risk of ...
Oct 31, 2020 · Any physical object that creates a barrier to unauthorized access. This includes: locks and latches, safe’s, alarms, guards and guard dog, doors and doors strikes/frames/closers, windows, ceilings and floors, walls and fences. Refers to safeguards placed as delaying mechanism between a prospective intruder and the target installation.
When interlocked guards utilize devices with a guard locking function , the only applicable reaching distance considerations are related to the mechanical restrictions. In other words, reaching over, through and under the physical barrier as discussed. However, when using guard locking interlocks, the time to achieve a safe condition (a.k.a. stopping time) must be accounted for when determining when the guard locking device can be unlocked – via the safety-related parts of the control system (SPR/CS) – and allow access to the hazard zone.
ANSI B11.19 establishes minimum performance criteria for each of the different functions physical barriers can fulfill when used for reducing risk to individuals . Additionally, each barrier must be evaluated based on the task/hazard pair (s) it is intended to address. If a hanging rubber curtain is used only to keep hazards (such as noise, exhaust, or swarf) away from individuals, then it could possibly be considered as a “shield.” However, if it is used to prevent individuals from accessing a hazard zone by reaching around, under, through or over the barrier, additional requirements apply before it will fulfill the conditions of a “guard.” If the barrier provides only simply contact to an individual, but does not prevent access, additional training must be provided in order to fulfill the requirements of an “awareness barrier.”
When a person can enter and be completely inside the risk reduction measures defining a perimeter or safeguarded space, the situation is referred to as “whole body access.” The new edition of ANSI B11.19 now includes an entire clause (9.11) addressing the various approaches which can be applied to effectively reduce risk. This section includes requirements for the interlocking device (including guard-locking interlocks) as it relates specifically to the ability to escape from a hazard zone. When this approach is used to address whole body access, an initiation warning system must also be applied to notify the individual with sufficient warning that they must exist the area.