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Joe_winter
As no R&D, ppap is necessary in our inc.But where chronically unstable processes in ppap manual I.2.2.9.2? We just offer cpk over time and never ppk for short-term studies, and I can not find one example. Pls help me!
Welcome to the Cove, JoeJoe_winter said:
UL 917
STANDARD FOR SAFETY FOR CLOCK-OPERATED SWITCHES
Scope
These requirements cover clock-operated switches rated 600 V or less, to be used in ordinary locations designed to close and open circuits to a load at predetermined intervals, and intended to be employed in accordance with the National Electrical Code, ANSI/NFPA 70.
These requirements cover only clock-operated switches in which the switching contacts are actuated by a clock-work, by a gear-train, by hand, by electrically-wound spring motors, by electric clock-type motors, or by equivalent arrangements. In addition to closing and opening the switching contacts, the devices may also indicate the time of day or time interval.
These requirements do not cover devices incorporating electronic timing circuits or switching circuits without separable contacts.
A clock-operated switch, which is incomplete in construction features or restricted in performance capabilities, is acceptable for use as a factory-installed component provided that the restrictions established for the component are eliminated when the component is installed.
Specific provisions are included in these requirements for TV rated clock-operated switches. A product that contains features, characteristics, components, materials, or systems new or different from those in use when the Standard was developed, and that involves a risk of fire, electric shock, or injury to persons, shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the level of safety for the user of the product as originally anticipated by the intent of this Standard.
Joe_winter said:Thanks remsqa as well as Howard!
Howard, your 'looseness of speech' greatly illumines me. sometimes, there are actually difficults to separate where ppk or cpk, as routine processes cpk are adequate, otherwise ppk will get more risks to be attained although it would provide your more informations important.
Don't got in long/short term? that is good idea,but I would have to face requirements from my customers. and my co. is not 6sigma without R&D, that is a small one, the usual reqest is cpk, except the recent ppk from a new customer.