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Topic Title: Maximum Earth Loop Impedance Values For Common Devices
Topic Summary: What About the Uncommon Devices
Created On: 02 February 2017 11:19 PM
Status: Read Only
Linear : Threading : Single : Branch
 Maximum Earth Loop Impedance Values For Common Devices   - keithredpath - 02 February 2017 11:19 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - Legh - 02 February 2017 11:36 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - alancapon - 03 February 2017 12:14 AM  
 Maximum Earth Loop Impedance Values For Common Devices   - leckie - 03 February 2017 07:17 AM  
 Maximum Earth Loop Impedance Values For Common Devices   - John Peckham - 03 February 2017 11:32 AM  
 Maximum Earth Loop Impedance Values For Common Devices   - keithredpath - 09 February 2017 06:11 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - weirdbeard - 19 February 2017 07:45 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - mapj1 - 19 February 2017 11:16 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - sparkingchip - 26 March 2019 10:40 PM  
 Maximum Earth Loop Impedance Values For Common Devices   - Alcomax - 27 March 2019 02:03 PM  
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 02 February 2017 11:36 PM
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Legh

Posts: 4427
Joined: 17 December 2004

Manufacturers of mccbs provide charts of time-current characteristics.
although not always as easy to find as the energy let-through for the larger OCPDs.

they specify leading to trailing edge currents for instantaneous disconnection where standard devices in the regs only give trailing edge disconnection currents.

3-5 Ia for type B
5-10 Ia for type C
10-20 Ia for type D

Legh

-------------------------

http://www.leghrichardson.co.uk

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