×
Follow Us
Results 1 to 2 of 2

Copper cable short circuit current withstand

    #1
  1. J2019L is offline Junior Member Pro Subscriber
    Join Date
    May 2014
    Location
    Seattle, WA
    Posts
    7
    Reputation

    Copper cable short circuit current withstand

    A 70 sqmm copper cable can withstand a short circuit current of 8.05kA for 1 second. If the protection relay operates in 0.2 second, then what is the maximum fault current that the cable can tolerate?

    The solve method seems to apply: 8.05kA * sqrt(1/0.2) = 18.0 KA
    Is there someone can find the source document to proof this concept?

  2. #2
  3. Join Date
    Apr 2018
    Location
    Michigan
    Posts
    40
    Reputation
    Quote Originally Posted by J2019L View Post
    A 70 sqmm copper cable can withstand a short circuit current of 8.05kA for 1 second. If the protection relay operates in 0.2 second, then what is the maximum fault current that the cable can tolerate?

    The solve method seems to apply: 8.05kA * sqrt(1/0.2) = 18.0 KA
    Is there someone can find the source document to proof this concept?
    I2T = I2T. Damage energy remains constant.

Subscribe

Login or register to leave a reply!


Share this thread

Related Topics

  1. Here's why you should always short a CT secondary
    By SecondGen in forum Safety and Arc Flash Talk
    Replies: 8
    Last Post: January 31, 2021, 10:26 AM
  2. Determine the approximate short circuit current available
    By rasilva in forum NETA Level 3 Exam
    Replies: 5
    Last Post: December 21, 2018, 06:25 PM
  3. ARC FLash and Short Circuit Coordination Study
    By mask1290 in forum Electrical Testing Talk
    Replies: 2
    Last Post: June 14, 2017, 08:40 AM
  4. Continuous current rating of a circuit breaker
    By mainmanmerc in forum NETA Level 2 Exam
    Replies: 4
    Last Post: October 22, 2016, 07:32 PM
  5. time current curves for fedral pacific circuit breakers
    By Herc8306 in forum Technical Documents
    Replies: 3
    Last Post: June 11, 2015, 06:52 PM

Tags for this Thread

Follow us


Explore TestGuy


NETA Certification Training


NICET Electrical Power Testing


Help and Support