Zsquestion

[lady electric]

~I have a word for word exam question for a mock i am doing please help:-

A final circuit is installed using single core pvc insulated copper cables in steel conduit. The steel conduit is used as the CPC. When an earth fault loop impediance test is carried out the result exceeds the maximum acceptable value of Zs.
Describe
a) 3 poosible faults that may cause the high reading
b) 1 test that may be applied to locate the fault

 

[i=p/u]

try your awnsers and i'l try and my 2pence worth and get you a star

 

[telectrix]

a.1.poor electrical connection between conduit sections.2. insufficient cable size. 3. poor earth to conduit.

b.wander lead from MET to all sections of steel containment.

 

[lady electric]

uummmm...... not the answer i was hoping for lol
wrong protective device....wrong size cpc.....uummmmm

 

[lady electric]

a.1.poor electrical connection between conduit sections.2. insufficient cable size. 3. poor earth to conduit.

b.wander lead from MET to all sections of steel containment.

Thanks telectrix

 

[telectrix]

can't have wrong size cpc as the cpc is the conduit and the size is fixed,

 

[lady electric]

can't have wrong size cpc as the cpc is the conduit and the size is fixed,

yes i saw that i did mean cable... hope i dont make that mistake if i have that question for the exam!!!