Many thanks to those who responded to my query about the use/meanings of the words 'shall' and 'must' in product safety standards. Must and shall appear to be interchangeable. UL1950 uses both (couldn't make up there minds?), but 'must' appears a lot in the Annexes. EN60950 (IEC950) uses 'shall' consistently. From the responses I got, 'will' is thrown in for good measure. Therefore, shall, must, and will mean 'mandatory'. 'Should' is a recommendation. I must, shall, will remember this. John A. Juhasz Product Qualification & Compliance Engr.
Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-567-8320 ext. 324 Fax: 516-567-8322
