When used as the enclosure for higher voltage equipment, it is standard practice to use a rotary disconnect with a mechanical interlock to prevent the door from being opened unless the equipment has been isolated from the supply.
When using standard 2 door enclosures, this creates a potential safety issue in this application. Although a rotary interconnect may be fitted to door #1, door #2 could be opened when the equipment is still live despite door #1 being fitted with a mechanical interlock.
To address this potential safety issue, Hammond Manufacturing has developed a simple safety interlock, the MIKIT, as an optional accessory for its 1422N4 and HN4WM wall mount and HN4FM floor standing mild and stainless steel two-door cabinets that feature centre-posts.
The 304 stainless steel MIKIT mounts onto the interior lock cams to prevent door #2 from being opened unless door #1 has safely been opened. It can easily be retrofitted in the field; it maintains the enclosure’s approval ratings and either the right or left door can be designated as the master, thereby taking into account the requirements of specific installations.
For more information, visit: www.hammfg.com.