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Discuss Zs over max zs in the Industrial Electrician Talk area at ElectriciansForums.net

K

KNIPEX

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Hi guys, done a test today on a ringmain circuit only 4 sockets but the zs was over the max zs as to bs7671.

now this was on a type c rcbo, so as its on an rcbo not mcb i believe this still complies.

if it was an mcb it would have to be changed to type b.

just wanted to double check.

thanks guys.
 
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jeremy

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Mentor
Arms
Why are there type c's on a ring final; are there lots of motors on the circuit? What's the Ze and how long are the legs from source to mid ring? I know!! question after question!!
 
K

KNIPEX

  • Thread Starter Thread Starter
  • #3
Why are there type c's on a ring final; are there lots of motors on the circuit? What's the Ze and how long are the legs from source to mid ring? I know!! question after question!!
all the rcbo are spec as type c 32a 30ma. that usual mate on loads of jobs.

no motors that would be type d wouldnt it???

i say the legs to mid point abot 20m.

havnt got the ze to hand sorry.
 
S

smoggy

  • Thread Starter Thread Starter
  • #4
all the rcbo are spec as type c 32a 30ma. that usual mate on loads of jobs.

no motors that would be type d wouldnt it???

i say the legs to mid point abot 20m.

havnt got the ze to hand sorry.
Normally type B, IMO cause it's on rcbo would say it complies
 

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