Hazardous Location Brigde Crane
Hazardous Location Brigde Crane
(OP)
We are installing a 3 ton explosion proof bridge crane here at our plant. The area is rated Class I Division 1 Group D and Class II Division 1 Group F & G. According to the NEC the cabling should be rated extra hard usage. This would be like SO cable. We would like to use a festoon system with flat ribbon cable because it has less problems when coiling and uncoiling. Is there a flat ribbon cable made rated for extra hard usage? What others are doing for bridge cranes in hazardous locations?
Thanks
Thanks






RE: Hazardous Location Brigde Crane
It would be best to have the crane supplier's fingerprints on the explosion-proof rating all the way back to your fixed power disconnect switch.
RE: Hazardous Location Brigde Crane
Thanks
RE: Hazardous Location Brigde Crane
In additon to power cable I think your going to need an air line to pressurize the big enclosures and at least two wires to operate the breaker that feeds the crane.
Enclosures on the crane are pressurize slightly over atmospheric. If any on them are opened a pressure switch is used to shut down all power to the crane.
RE: Hazardous Location Brigde Crane
For the hazardous location, we are installing the controls in the equipment room rather than up on the crane. Our previous experience with having the controls on the crane is that it becomes very laborious removing all of the bolts used for explosion proof enclosure.
We have used the Bebco style pressure switches on other equipment when can't purchase something rated for the hazardous environment.
Thanks again
RE: Hazardous Location Brigde Crane
What requirement is there for your mechanical componet design under this hazardous classification. The festooning for example has sliding metal components. Is there a code that determine what designs/materials you select?
What about the wheels, is there a code that determines if the crane wheels are suitable for this environment