Wall penetration seals for hazardous locations

Firestopping may not be the first thing that comes to mind for an electrical engineer designing a power system. Too often, the solution to firestopping a bank of conduits is left to the architect or contractor. This can lead to costly construction workarounds and delays in getting a building occupancy permit. Ideally, the electrical engineer will be working with the architect to understand where the rated assemblies walls and floors are in a building and designing their power system with those assemblies in mind. This consideration taken into account early in the design can save a lot of construction cost and angst at the end of the project.

Login or Sign Up. Posts Latest Activity. Page of 2. Filtered by:. Previous 1 2 template Next. Good afternoon guys, I have this intercom unit that has 2 lines coming out the bottom or possibly just one if we can fit the audio and power cables through the one hole that is positioned in a Class 1 Division 2 hazardous zone on the outside of the cabin of a drilling rig. We have ordered some conduit sealing fittings, but the problem arises with the actual process of passing the conduit line through the wall.

Seven experts explain the hazardous and extreme circumstances that require the extra cable and wire protection in the form of conduit outside the enclosure. As the Industrial Internet of Things IIoT continues to gain mindshare and acceptance, the roles of the cables, connectors and wires that move the data become more important. There are also some armored cable types that can be used in Div. Conduit and conduit seals are necessary when connecting to NEMA 7 explosion-proof enclosures.

The electric utility will have an approved method and material to seal ducts in all new, altered or retro-fitted cable installations. The picture opposite shows unsealed electrical ducting and void openings located at a waste water treatment WTW plant — the open cable ducts undermine the purpose of the nearby fire door and should be sealed using fire rated cable duct seals. Penetration Seals — the integrity and insulation protection provided by the fire rated duct sealant will ensure up to 4 hours fire resistance in ducts. The seals can be customised to suit fire rated sealing applications including substation ducts, partitions, walls, floors, and construction systems including MV-HV switch rooms and transformer grids. Duct seals suitable for LV-HV power cables in single, trefoil or multiple configurations, including 11kV Triplex and 33kV high voltages.