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Safety Questions

Question Asked:

I have a robot cell with a large steel structure inside of it. The robot's workspace is inside of this structure. Access to one side of the structure is needed very rarely (maybe once a year) for maintenance on different parts of the structure. We have put "drop-n-lock" style fencing (requires a tool to lock and unlock the panels) with no movable panels (gates, etc..) on this side. Access to this area is only possible if fence panel(s) are removed. If maintenance/repair is needed, the operator will need to remove a panel (using a tool) to gain access. Is the fact that a tool is needed to do this sufficient? or do the panels that are deemed "removable" for maintenance need to be interlocked?

2 Answers

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Erik Johnson - Innovation Manager
WireCrafters LLC
ejohnson [at] wirecrafters [dot] com
(502) 357-7264

Good afternoon David, Fence panels that can only be removed by the use of a tool are referred to as Fixed Guards in ANSI B11.19-2019. Fixed guards do not require the use of an interlock. Movable guards, guards which can be opened without the use of tools, as defined by ANSI B11.19-2019. Thanks, Erik Johnson

Lee Burk - Manager, Training & Standards
Pilz Automation Safety L.P.
l [dot] burk [at] pilzusa.com
(734) 354-0272

"Removable" panels do not require interlocks. Prior to this access for maintenance, full LOTO is required.

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