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Dynamic elaboration on the Art & Science of Hazardous Area Protection
To use..or NOT to use ..Conduit-Hub or Cable-Gland
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CONDUIT HUBS
Conduit Hubs are used to terminate the conduits into an enclosure .
Hub is installed, through a drilled hole into the certified enclosure and fastened by means of the lock-nut.The conduits are threaded onto this hub .
Hubs provide a convenient means for installing a threaded conduit on a junction box or device enclosure.
Example: Intrinsic Safety (is) Enclosures. (NFPA 70 Art. 504 , IEC 60079-14)
In case a conduit HUB is being installed then conduit seals should be installed about 15 cm, from the boundary of the electrical enclosure, into the conduit.
Proper installation requires :
- Mounting (by screwing) of the SEAL onto the conduit (pipe)
- Proper adjustment of the electrical wires inside the SEAL
- placement of suitable quantity of fiber at inside the seal in order to stop the flow of the compound
- Pouring in the Sealing Compound .
- Closing the SEAL opening.
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