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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Conduit pipes are normally used to protect ________________ cables.
unsheated cables
armoured
PVC sheated cables
all of above
unsheated cables
Quick Summary: Conduit pipes act as a mechanical protection system for electrical conductors that lack their own external protective layers. By providing a rigid or flexible physical barrier, they shield unsheathed wires from moisture, chemical damage, and physical impact.
Conduit pipes act as a mechanical protection system for electrical conductors that lack their own external protective layers. By providing a rigid or flexible physical barrier, they shield unsheathed wires from moisture, chemical damage, and physical impact.
Rinsulation=ρAl — Insulation resistance depends on material resistivity
Icapacity=Rthermal⋅RacTmax−Tamb — Current carrying capacity influenced by environmental enclosure
In electrical installations, cables without protective sheathing are highly susceptible to insulation degradation due to environmental factors. Conduit systems enclose these conductors within a tube, effectively creating a dedicated raceway that isolates the cable from mechanical stress, abrasion, and rodent damage. This is essential for maintaining the integrity of the dielectric insulation of unsheathed wiring.
Conduits are classified as Rigid PVC, Rigid Steel, or Flexible conduits.
The primary function of a conduit is physical protection and organizing conductor runs.
In industrial environments, metallic conduits are preferred for electromagnetic interference (EMI) shielding.
The fill factor of a conduit is strictly regulated to prevent overheating due to impaired heat dissipation.
Provides high resistance to mechanical impact and crushing.
Facilitates easier cable replacement and maintenance.
Offers a pathway that is safe from fire spreading in internal building structures.
Increased labor cost during installation.
Reduced current-carrying capacity due to heat trapping inside the tube compared to open air installation.
Residential and industrial building wiring.
Protection of cables in hazardous or dusty environments.
Outdoor areas requiring weather-resistant cable housing.
Armoured cables (Option B) are designed with their own steel wire/tape armor and do not require additional conduit for mechanical strength.
PVC sheathed cables (Option C) already possess a protective outer jacket, though they may still be placed in conduits for aesthetic or localized protection.
The standard for conduit installation is governed by the National Electrical Code (NEC) or equivalent Indian Standards (IS 9537).
A is correct — Conduit pipes provide the necessary mechanical protection for wires that lack an integrated sheath.
Always remember that 'Armoured' cables are designed for direct burial and self-protection; if an MCQ asks about conduits, look for 'unsheathed' or 'bare' conductors as the primary use case.