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Discuss disconnection time permitted for protective devices? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

E

electritaz

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what is the disconnection time of the protective devices protecting :
a) a socket outlet circuit
b) a fixed water heater circuit?
 
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A

acat

  • Thread Starter Thread Starter
  • #2
If you have a copy of BS7671 regs your answer is on pages 46 to 50 if not waht system do you have ie TT TNCS TNS and do you have fuses or RCD/MCBs

Chris

Normally 0.4 seconds for domestic circuits and 5 seconds for distribution if I remember correctly

Chris
 
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S

Spudnik

  • Thread Starter Thread Starter
  • #3
As above, but the 5s disconnection time depends on the installation method of the distribution circuit.

Also, TT systems disconnection times are lower.
 
R

riotmaster

  • Thread Starter Thread Starter
  • #4
and because of that, osg says generally to achieve the disconnection times, EVERY circuit must be protected by an RCD, in one form or another...on a TT system
 
M

Mac

  • Thread Starter Thread Starter
  • #5
and because of that, osg says generally to achieve the disconnection times, EVERY circuit must be protected by an RCD, in one form or another...on a TT system
All circuits on a TT system should be RCD protected:D
 

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