D
Ducksy
Hey all I would like some feed back on my companies guide to testing procedures.
We only repair electric showers or replace like for like.
My issues are
we never issue a MWC when replacing shower units.
No Zs reading are taken and main earth bonding is not checked, though we do IR tests.
And lastly no safe isolation procedure, all we are asked to do it switch off mcb or isolator switch, then test for dead at shower terminal block, no locking off.
I personally think it needs updating to at least checking Zs what do you guys think here the procedure below
Many thanks
STANDARD ELECTRICAL TEST PROCEEDURES FOR ELECTRIC SHOWERS
1. Conduct visual inspection of front cover. (Has cover been fitted correctly?)
2. Isolate unit via isolation switch or consumer unit before removing the cover.
3. At terminal block test L – N (Ensure 0 volts).
Conduct visual inspection of wiring connections (Ensure supply cable is adequate for kW rating of unit and terminal block connections are fully tightened)
4. At terminal block test for zero ohms (Establish no closed circuit switches)
5. At terminal block conduct insulation resistance test L – E, N – E (Ensure above 2M ohms. If below 2M ohms disconnect supply L - N and retest. Identify if supply or unit fault)
6. Where possible fit magnet and test for leaks and correct flow adjustment.
7. Dead test components where possible (Check continuity/ohms readings of switches, solenoid and elements)
8. Replace failed components as required.
9. Turn on power to unit. Test L – N, L – E, N – E (Establish correct polarity and supply earth connected)
10. Ohms test between unit earth terminal and incoming metal pipe. (Should be 0.1 ohm. Advise customer if no earth bonding to metal pipe).
11. Where applicable complete voltage tests for electronic/pcb functions. (Replace parts as necessary)
12. Repeat insulation resistance tests if replacement part/s fitted.
13. Complete unit functional tests (Volt drop reading to be less than 10v – ensure outlet thermal cut-out operates at 50°C ±3°)
14. Establish circuit protection fuse/mcb is correct size for unit. (Advise customer if incorrect size fitted)
15. Where a shower circuit is deemed to be unsafe leave the unit isolated at the fuse/mcb.
We only repair electric showers or replace like for like.
My issues are
we never issue a MWC when replacing shower units.
No Zs reading are taken and main earth bonding is not checked, though we do IR tests.
And lastly no safe isolation procedure, all we are asked to do it switch off mcb or isolator switch, then test for dead at shower terminal block, no locking off.
I personally think it needs updating to at least checking Zs what do you guys think here the procedure below
Many thanks
STANDARD ELECTRICAL TEST PROCEEDURES FOR ELECTRIC SHOWERS
1. Conduct visual inspection of front cover. (Has cover been fitted correctly?)
2. Isolate unit via isolation switch or consumer unit before removing the cover.
3. At terminal block test L – N (Ensure 0 volts).
Conduct visual inspection of wiring connections (Ensure supply cable is adequate for kW rating of unit and terminal block connections are fully tightened)
4. At terminal block test for zero ohms (Establish no closed circuit switches)
5. At terminal block conduct insulation resistance test L – E, N – E (Ensure above 2M ohms. If below 2M ohms disconnect supply L - N and retest. Identify if supply or unit fault)
6. Where possible fit magnet and test for leaks and correct flow adjustment.
7. Dead test components where possible (Check continuity/ohms readings of switches, solenoid and elements)
8. Replace failed components as required.
9. Turn on power to unit. Test L – N, L – E, N – E (Establish correct polarity and supply earth connected)
10. Ohms test between unit earth terminal and incoming metal pipe. (Should be 0.1 ohm. Advise customer if no earth bonding to metal pipe).
11. Where applicable complete voltage tests for electronic/pcb functions. (Replace parts as necessary)
12. Repeat insulation resistance tests if replacement part/s fitted.
13. Complete unit functional tests (Volt drop reading to be less than 10v – ensure outlet thermal cut-out operates at 50°C ±3°)
14. Establish circuit protection fuse/mcb is correct size for unit. (Advise customer if incorrect size fitted)
15. Where a shower circuit is deemed to be unsafe leave the unit isolated at the fuse/mcb.