Advertisement - Content continues below
Advertisement - Content continues below

Discuss - Prospective fault current test 2391 in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hello all,

I’m now overthinking the - Prospective fault current test for the 2391 practical, the exam boards will be a 3 phase and a single phase board.

Do I test the three phase board and double the highest and use that for both DB’s or do I do one for 3 phase db1 and sep one for single phase db2
 
uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members
Advertisement - Content continues below

H

-
Arms
The three phase board will be the origin, for the office just remember to record the Zdb and ipf information, top left on the schedule of test results
 

Strima

-
Arms
Esteemed
Test as close to the source as possible with parallel paths in place.

Test all three phases to earth then all three to neutral.

If your test meter is capable then test across all phases, L1 to L2, L2 to L3 then L2 to L3.

If you can’t test phase to phase then double the highest single phase measurement.

Do you know the difference between PSSC & PEFC?
 
  • Thread Starter Thread Starter
  • #8
Test as close to the source as possible with parallel paths in place.

Test all three phases to earth then all three to neutral.

If your test meter is capable then test across all phases, L1 to L2, L2 to L3 then L2 to L3.

If you can’t test phase to phase then double the highest single phase measurement.

Do you know the difference between PSSC & PEFC?
Yes I’m ok with that, Thank you
 

Richard Burns

-
Mentor
Arms
Esteemed
Prospective fault current at origin is the highest current, further into the installation the current will drop due to circuit resistances.
If the protective devices in the next DB are able to withstand the fault current at origin there is no need to measure again at the next DB because you already know they are OK.
 
  • Thread Starter Thread Starter
  • #10
Do not flap, just chill out and concentrate
H,
I seam to remember you listed the three faults you had somewhere on here?.
Don’t suppose you can remember can you ?
 

H

-
Arms
Of course...

1) High reading on Main protective bonding conductor.

2) Low insulation resistance on the sub board / office board between neutral and earth.

3) No cpc continuity on the switch wire on one of the lights on a lighting circuit.

Also had a couple of high Zs readings due to poor connections and contact resistances.
 
D

Deleted member 26818

Looking at that test rig, there are 10 possible faults.
 
uHeat Banner - Forum Discount Available
This official sponsor may provide discounts for members
Advertisement - Content continues below

Reply to - Prospective fault current test 2391 in the Electrical Forum area at ElectriciansForums.net

Wetroom Store - Network Wetroom Suppliers
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
Advertisement - Content continues below
Top Bottom