Brian,
I assume 24 Vdc derived from a secondary isolated circuit. Like a transformer in a switch mode power supply, the motor can be evaluated to the end-product standard, it does not have to be an approved component. However as part of their investigation, the NRTL or other certification body may be asking for the blower construction details such as winding wire size, insulation class, polymeric materials used, etc. Depending on the NRTL or certification body, some or all of these parts may be tied down as critical components. During the NRTL or certification body follow-ups, these critical components become subject to inspection. Depending on the inspector visiting the factory, he/she may be asking to verify the parts meet the specs in the critical component list. This can be easily resolved by obtaining a CoC for every shipment from the blower manufacturer. The CoC can show drawings of the blower construction (magnet wire manufacturer, type and class, polymeric material manufacturer and grade designation, etc. To make the story short, no the blower does not have to be approved. It can be evaluated as part of the end-product standard. Best Regards, Peter --- On Wed, 6/25/08, Kunde, Brian <[email protected]> wrote: From: Kunde, Brian <[email protected]> Subject: DC Brushless Blower Motor To: [email protected] Date: Wednesday, June 25, 2008, 5:58 AM Our engineering group wants to use a small cross flow blower that has a brushless DC motor rated 24Vdc at only 1 amp. The blower assembly and motor does not have any safety agency approvals though it is built by a reputable motor company. Our company has a general rule that all motor devices must have UL, CSA and either TUV or VDE agency approval. Unfortunately, this blower assembly is not common and engineering cannot locate a compatible blower that has agency approvals. Being that the blower motor is only 24Vdc at 1 amp and it is brushless, I assume the risk of fire is low. We could perform the locked rotor test and limit the input current. What other safety tests could be performed to adequately evaluate the use of this blower? Are there any safety standards specific to dc brushless motors? Would an NRTL require this kind of motor to have agency approvals? Thanks in advance, The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
