In regard to the access of hazardous voltage parts by the operator, Amendment 2 of IEC 1010 changes the wording of clause 6.1.1 to the following:
"If it is not feasible for operating reasons to prevent the following parts being both accessible and hazardous live, they are permitted to be accessible to the operator during normal use while they are hazardous live." The standard then lists lamp sockets, batteries and terminals that are allowed to be accessible. There is no mention in this clause of allowing other hazardous circuits in the equipment to be accessible to the operator. Other circuits must comply with clause 6.2, which determines accessibility after operator access panels have been removed. Patty Elliot TUV Rheinland of N.A. 11995 El Camino Real, Suite 101 San Diego, CA 92130 (619) 792-2770 X37 [email protected] At 09:24 AM 9/20/96 MST, Ray Russell wrote: > Dear Friends, > > I've received some contradicting information in relation to the need > for interlocks, and would like to bring it up to the group for > discussion. We have an instrument that has a removable side panel. A > tool is required to remove the panel and there is hazardous voltages > behind the panel. The user is instructed to remove the panel for > installing options, and maintenance. > > Opinion 1 - Access is restricted by a tool, so no interlock is > required. EN61010-1 sec 6.1.1 states: > > The following Hazardous live parts are permitted to be accessible to > the operator during normal use: > > - parts intended to be replaced by the operator (e.g. batteries) and > which may be Hazardous live during the replacement or other operator > action, but only if they are accessible only by means of a tool and > have a warning marking.. > > Opinion 2 - When an operator is instructed to remove the panel, an > interlock is required. An agency told me that once an operator is > instructed to remove a panel, it is treated as if no tool was required > to remove it. > > Also, if anyone has information on high integrity components, such as > interlock switches and relays, I would appreciate some information. > > Thank you for your thoughts. > > Ray > > [email protected] > >
