RCDD · Question #122
Based on documentation contained within the Insulated Cable Engineers Association (ICEA) standard P32-382, Short Circuit Characteristics of Insulated Cable, a copper conductor is capable of safely…
The correct answer is B. Five. Per ICEA P32-382, a copper conductor can safely carry 1 ampere for 5 seconds for every 42.25 circular mils of cross-sectional area during a short circuit event.
Question
Based on documentation contained within the Insulated Cable Engineers Association (ICEA) standard P32-382, Short Circuit Characteristics of Insulated Cable, a copper conductor is capable of safely carrying one ampere for ________ second(s) for every 42.25 circular mils.
Options
- AOne
- BFive
- CTwelve
- DTwenty
- EThirty
How the community answered
(24 responses)- A4% (1)
- B75% (18)
- C13% (3)
- D8% (2)
Why each option
Per ICEA P32-382, a copper conductor can safely carry 1 ampere for 5 seconds for every 42.25 circular mils of cross-sectional area during a short circuit event.
One second is too short and does not match the duration specified in ICEA P32-382 for the 42.25 circular mils per ampere relationship.
ICEA standard P32-382 establishes that copper conductors have a short-circuit current rating of 1 ampere per 42.25 circular mils for a duration of 5 seconds before the thermal energy causes insulation damage. This relationship is used to size conductors appropriately for fault current protection in cable systems.
Twelve seconds exceeds the duration defined in ICEA P32-382 and would overstate the conductor's safe short-circuit withstand time.
Twenty seconds is far beyond the ICEA-specified duration and does not correspond to the standard's short-circuit thermal withstand rating.
Thirty seconds greatly exceeds the ICEA P32-382 specified value and would result in conductor or insulation damage if used as a design threshold.
Concept tested: ICEA P32-382 copper conductor short circuit rating
Source: https://www.icea.net/p-32-382-short-circuit-characteristics-of-insulated-cable/
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