-----Original Message----- From: JENKINS, JEFF [SMTP:jeff.jenk...@aei.com] Sent: Thursday, August 12, 1999 3:09 PM To: 'emc-p...@ieee.org' Subject: NEMA 4 cabinet questions
Some questions about using a NEMA 4 cabinet: (1) Is the environment inside the cabinet considered pollution degree 1, no matter what the external environment is? I believe Pollution Degree 1 is intended for potted or encapsulated parts (2) We need to install a water drain at the bottom of the cabinet. Can we use a positive-acting valve without violating the cabinet's NEMA 4 rating? As long as it meets the requirements in UL 50 or the equivalent NEMA standard (3) The cabinet doors will need to be opened periodically for maintenance. How does this affect the pollution degree inside the cabinet? If dust or other pollution is present when the doors are open, I suspect Pollution Degree 3 would apply By the way, these questions are in the context of certifying the product under the CB 950 scheme. You may want to concentrate on an IEC 60529 IP rating for international use. The Certification Body should be able to advise you of any specific country deviations. Thanks, Jeff Jenkins Advanced Energy Industries, Inc. Best Regards, Jody Leber jle...@ustech-lab.com http://www.ustech-lab.com U. S. Technologies 3505 Francis Circle Alpharetta, GA 30004 770.740.0717 Fax: 770.740.1508 --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
