Hello, I'm working with an engineering team that wants to use the electrical enclosure as the bus for the bonding circuit. The item is a smallish piece of machinery for indoor industrial use. The motivation is to save the cost of a separate copper busbar and reduce the length of bonding wires inside the enclosure.
IEC 60204-1 appears to allow this with stipulations: Metal enclosures or frames or mounting plates of electrical equipment, connected to the protective bonding circuit, may be used as protective conductors if they satisfy the following three requirements: * their electrical continuity shall be assured by construction or by suitable connection so as to ensure protection against mechanical, chemical or electrochemical deterioration; * they comply with the requirements of 543.1 of IEC 60364-5-54:2011; * they shall permit the connection of other protective conductors at every predetermined tap-off point. NFPA 79 appears to not allow this (unless the enclosure were made of copper...): 8.2.2.1 Conductors used for grounding and bonding purposes shall be copper. Stipulations on stranding and flexing as outlined in Chapter 12 shall apply. What are your thoughts on connecting the bonding system this way? Is NFPA 79 as inflexible in this regard as I am reading it? Thanks in advance, Mark Stultz 10175 Philipp Parkway Senior Mechanical Development Engineer Streetsboro, OH 44241 CMSE® - Certified Machinery Safety Expert (TÜV NORD) 330-342-2402 Automated Packaging Systems [cid:[email protected]] autobag.com<https://www.autobag.com/> SealedAir.com<https://sealedair.com/> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 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]>
