exam answer.
if you have a Zs that is too high on a cicuit protected by a B type Bsen60898 MCB, then youhave the followibng options, assuming no loos connections, as by this time you woul have already carried out all dead tests, and ruled that out.
a) Replace MCB with an RCBO to bsen61009
b) Replace CPC with one of a larger CSA.
c) Rewire the circuit.
d) use supplementary bonding to reduce your Zs.
e) reduce the length of the circuit
f) if the MCB is overrated for the load, then reduce the rating of the MCB.
end of exam answer
ifthere is little differencee between the measured Zs and the corrected Zs is minimalm, then you may carry out more detailed calculations to arrive at a more accurate figure otabulated Zs, in otherwords more accurate than the rule of thumb.
Also, Loop testers are affected by noise on the electrical system, and you may find that Zs= Ze +R1+R2 is a better method arriving at Zs. You will probably notice this, as your measured Zs will be higher than the above calc, and it should be the same, or lower (90% of the time lower)
if you have a Zs that is too high on a cicuit protected by a B type Bsen60898 MCB, then youhave the followibng options, assuming no loos connections, as by this time you woul have already carried out all dead tests, and ruled that out.
a) Replace MCB with an RCBO to bsen61009
b) Replace CPC with one of a larger CSA.
c) Rewire the circuit.
d) use supplementary bonding to reduce your Zs.
e) reduce the length of the circuit
f) if the MCB is overrated for the load, then reduce the rating of the MCB.
end of exam answer
ifthere is little differencee between the measured Zs and the corrected Zs is minimalm, then you may carry out more detailed calculations to arrive at a more accurate figure otabulated Zs, in otherwords more accurate than the rule of thumb.
Also, Loop testers are affected by noise on the electrical system, and you may find that Zs= Ze +R1+R2 is a better method arriving at Zs. You will probably notice this, as your measured Zs will be higher than the above calc, and it should be the same, or lower (90% of the time lower)
