Richard - The requirement applied below is due to the largest commercially available fuse size for a form factor. The smallest branch circuit protection fuse form factors (both Edison base and cartridge) serve up to 30A. Interesting that they'd require a time-delay fuse, but that must be because you can fit a time-delay fuse into a nontime-delay fuse holder.
I'm more surprised that an Edison base was required, rather than allowing a cartridge type. Was there a particular rationale for this? Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA [email protected] From: Richard Pittenger Sent: Wednesday, January 29, 2003 4:58 AM Rich and group, Just one interesting point continuing the thought of fuse sizes for branch circuit protection. Awhile back, I was conducting a series of UL tests on a household food mixer. For one of the abnormal tests, UL required me to use a 30 A time-delay branch circuit fuse (lamp base) in the power supply to the unit under test. I thought this was extreme, believing that a 20 A fuse would be the maximum anyone would ever use. When questioned, I was told that such fuses are available and still in use, primarily in old residential areas. I visited my local hardware store and, sure enough, they were readily available, right along with the other more common sizes. You may want to consider this when considering such tests in the future. Good day, Richard Pittenger Agency Approval Engineer Hobart Corporation This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
