You can be sure that integrated safety standards with very broad scope would
be large, complex and very costly. For example, IEC 60335, for 'household
appliances and similar' alone, consists of 111 separate standards at
present. Few cost less than USD100.

With best wishes DESIGN IT IN! OOO - Own Opinions Only
www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England

Is there a homeopathic remedy for excessive gullibility?


-----Original Message-----
From: Richard Nute [mailto:[email protected]] 
Sent: Monday, July 11, 2016 9:22 PM
To: [email protected]
Subject: Re: [PSES] Fire requirements in standards

> Why would they need to limit scope to just
business
> machines and the like?   Why couldn't this be
applicable
> to a broad range of electrical equipment, from
television
> receivers to solar inverters?

Traditionally, product safety standards have been
written for a specific product.   Few product
safety practitioners have worked with different products, so have not seen
the common threads between the different products.  Those that have seen the
common threads are unwilling to step up to the plate and write standards
based on energy sources rather than on products.  In 1961, James J. Gibson
postulated: 

"Injuries to a living organism can be produced only by some energy
interchange. Consequently, a most effective way of classifying sources of
injury is according to the forms of physical energy involved. The analysis
can thus be exhaustive and conceptually clear. Physical energy is either
mechanical, thermal, radiant, chemical, or electrical."

We could have safety standards based on injury, such as an electric shock
safety standard, applicable to ALL products.  Most of my colleagues would
object to such a safety standard.

Most safety standards are "inversions of bad experiences," as colleague
Ulrich Sattler said.
Indeed, UL was founded by bad experiences.  


Rich

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