Machinery Safety 101

ISO/DIS 13849 – 1 Available for Public Review

Decision tree used to determine PL based on risk parameters.

Update 2020-10-11: The next three-day ISO/TC 199/WG8 meet­ing runs Tues­day-Thursday this week. Our com­mit­tee mem­bers will be wad­ing into the next 1 600 com­ments along with expert mem­bers from around the…

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Brexit’s impact

Brexit: UK and EU Flags against a blue sky

The UK Con­ser­vat­ive Party win last week has finally drawn an end to the ongo­ing uncer­tainty cre­ated by the Brexit ref­er­en­dum and the dither­ing that fol­lowed the UK Par­lia­ment. Prime…

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Using Form C relays in safety circuits

I recently had a dis­cus­sion with a col­league who wanted to know if it was OK for a design to include a form C relay in an e‑stop cir­cuit. You might recall that e‑stop func­tions…

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EU Machinery Directive Public Review

Rule books stacked up on a table in a library.

If you ship machinery products to the EU the Machinery Dir­ect­ive affects you. You have a chance to con­trib­ute to the review of this doc­u­ment.

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Force and injury — How hard is too hard? ISO/TR 21260 will help

ISO/TS 15066 body model
This entry is part 5 of 5 in the series Hier­archy of Con­trols

Force rep­res­ents the mech­an­ic­al energy that causes injury to the human body. ISO/TC 199 has been work­ing on answer­ing that ques­tion since 2012.

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Instructions for Use – the New ISO 20607

Instruc­tions are one of the basic items that users expect to get when they pur­chase a product, and yet these import­ant doc­u­ments are often poorly writ­ten, badly trans­lated, and incom­plete. Key…

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More E‑Stop Questions

This entry is part 17 of 16 in the series Emer­gency Stop

Here are some more ques­tions I’ve been asked regard­ing emer­gency stop require­ments. These ones came to me through the IEEE PSES EMC-PSTC Product Com­pli­ance For­um mail­ing list. Primary Sources There…

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Can Emergency Stop be used as an “on/off” control?

Emergency Stop Button
This entry is part 16 of 16 in the series Emer­gency Stop

Every couple of months I get an email ask­ing me if there is any reas­on why e‑stop func­tions can­’t be used as the primary power con­trol (on/off but­ton) for machinery. Fol­low­ing…

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Introduction to Functional Safety Seminars

Man training a group of people, pointing to Functional Safety topics on the whiteboard

If you are inter­ested in func­tion­al safety, and I know many read­ers are based on the stat­ist­ics I see for my oth­er func­tion­al safety-related posts, I think you will be inter­ested in this.…

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1,000,000

1 Million Views!

1,000,000 views! Today marks a fant­ast­ic mile­stone for the Machinery Safety 101 blog – 1,000,000 views! When I star­ted writ­ing this blog back in Octo­ber 2008, I had high hopes that a few dozens,…

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