IEEE C37.20.1-2002 pdf download IEEE Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear Amendment 1: Short-Time and Short- Circuit Withstand Current Tests— Minimum Areas for Multiple Cable Connections
Short-time withstand tests shall be made using one of the following arrangements:
a) The test shall be made with a circuit breaker of a type that has previously met the design test requirements for short-time current performance as specified in ANSI C37.50-1989 or IEEE Std C37.14-1999, and shall be located in the uppermost compartment. The circuit breaker shall be closed and the direct acting trip device shall be removed, or alternatively, made inoperative.
b) If a circuit breaker compartment is not physically equivalent to the qualified circuit breaker enclosure or the switchgear stationary primary disconnecting devices and insulating supports for drawout circuit breaker are not identical to the qualified circuit breaker, the short-time current test shall include a circuit breaker of the construction used. The circuit breaker shall be closed and located in the uppermost compartment, and the direct acting trip device shall be removed or made inoperative.
c) If the switchgear circuit breaker compartment is physically equivalent to the qualified circuit breaker enclosure and the switchgear stationary primary disconnecting devices and insulating supports for the drawout circuit breaker are identical to the qualified circuit breaker, no additional testing of the circuit breaker, circuit breaker compartment, or associated conductors is required. In this case, the circuit breaker compartment stationary incoming primary disconnecting devices shall be connected to the circuit breaker compartment outgoing stationary primary disconnecting devices. The connections shall be within the compartment and, in so far as possible, shall not add bracing to the structure being tested. The uppermost circuit breaker compartment shall be used for the test.
6.2.4.1 Primary bus and connections
6.2.4.1.4 Test connections
Change the first paragraph as follows:
For LV ac switchgear, the main bus terminals shall be connected to the test circuit power source, and the circuit breaker compartment outgoing terminals shall be connected together by shorting bars at the farthest point from the circuit breaker compartment terminals.
Insert the following as the last paragraph:
The short-circuit connections shall be of minimum length with cross section equal to the bus being tested.
Insofar as possible, the connections shall not add bracing to the bus structure being tested.
6.2.4.1.5 Performance
Insert the following after item c):
In addition, if the test is performed with a drawout circuit breaker, the switchgear shall comply with thefollowing:
IEEE C37.20.1-2002 pdf download
PS:Thank you for your support!
