6.1.7 Lighting, Access, and Electrical Work
The illumination shall be not less than 100 lx (10 fc) at the floor level. The lighting control switch shall be located within easy reach of the access to such rooms and located so that it can be operated without passing over or reaching over any part of the machinery.
The control equipment shall be exposed to interference levels at the test values specified for "safety circuits." The interference shall not cause any of the conditions described in 220.127.116.11.1(a) through 18.104.22.168.1(f). If enclosure doors or suppression equipment must remain installed to meet the above requirements, warning signs to that effect shall be posted on the control equipment.