Richard Having had a look at 60950, my own quick reading of the requirement takes me to the following:
- the 2nd & 3rd paras of Cl 17.1 where it talks about operator access areas for locations of markings - Cl 2.6.2 which talks about disconnect devices The next step would be reference to Installation Regulations - and thus I refered to a copy (not the latest!) of the IEE Wiring Regs (BS 7671), which are now based on the IEC 364 model and thus will probably be pretty similar in most other European countries. Section 537 deals with "Isolating and Switching Devices", and I think the most relevant item is 537-04 E" Devices for Emergency Switching" para 537-04-04 which reads: "The operating means for the device for emergency switching shall be clearly identifiable and preferably coloured red. It shall be installed in a readily accessible position where the hazard might occur and, where appropriate, further devices shall be provided where additional emergency switching may be needed." The underlined words (begining "It shall be...." ) appear to be the crux of the matter since the ability to isolate/shut-down of the equipment in an emergency is probably one of the most important elements of a safe installation. The ability to isolate the equipment for installation, functional and service purposes are also important - but would take a secondary seat to the potential emergency situation in my book and that is the attitude I take with our own equipment designers. What good is any such device if you can't actually reach and operate it when you really need to? I am sure that other people will be able to find similar requirements in their own national regs - and it would be useful if someone can identify these in the US NEC and Canadian CEC. Regards John Allen Racal Defence Electronics Ltd ---------- From: [email protected][SMTP:[email protected]] Sent: 09 March 2000 16:08 To: [email protected] Subject: Disconnect Device Clause 1.7.2 of IEC 60950 and its clones requires the installation instruction to state that permanently connected equipment must have a "readily accessible" disconnect device incorporated in the fixed wiring if the equipment does not have a disconnect device. What is the criteria for assessing if the disconnect device is "readily accessible"? Richard Woods ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
