All: A couple of weeks back I posted a message regarding a CENELEC Decision that impacted the use of varistors between mains conductors and ground. I have appreciated the resulting messages / dialogues, but I still am unclear about my initial questions:
1) Is this Decision only for pluggable equipment type A, or is the spark-gap / fuse requirement in effect for pluggable equipment type B as well? 2) Will Denmark, UK, and Sweden accept varistors to ground if the circuit contains a spark-gap and two fuses? If this Decision means DK, UK, SE will simply not accept varistors to ground, then a lot of small pluggable type A equipment intended for sale in DK, UK, SE will have to either: 1) discontinue using varistors, or 2) become pluggable equipment type B (which would be onerous, given the IEC 309 plugs I've seen). I appreciate your input. John Boucher jpbouc...@lucent.com Decision text: Varistors Transient suppressors between the mains and the protective earth cannot be accepted by the following countries: * pluggable equipment type A: Austria, Belgium, Denmark, Finland, Norway, Sweden, UK pluggable equipment type B: Belgium, Denmark, Norway, UK A combination of a varistor in series with a spark gap (gas tube,) complying with basic insulation, and with a fuse will be accepted for: a) pluggable equipment type B and permanently connected equipment: * by all countries b) pluggable equipment type A: * by all countries except Denmark, UK, and Sweden For pluggable equipment type A two fuses are required. (to ensure that even by non-polarized plugs a fuse is provided) Permanently connected equipment connected to protective earth: * accepted by all countries --------- 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, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
