Service Entrance
Residual current protective device can not be used at this point.
Owing to parallel return path for the fault current
Residual Current Sense
N 
With reference to IEC
Earthing arrangements and protective conductors - Symmetra MW in TT installation |
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| See: |
| IEC | § 413.1.4 |
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Switchgear |
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| Q3 |
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| Residual Current Sense | Residual current protective device |
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| can be used. | |
Q5 |
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| External | Q6 |
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| Bypass - input |
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| Bypass - output |
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| L1 |
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| L1 |
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| L2 |
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| L2 |
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| L3 |
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| L3 |
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| Main Protective Earthing Terminal |
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| PE |
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| PE | Q4 |
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| PE | |
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| Symmetra MW |
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Q1 |
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| Mains - input |
| i | Delta | UPS - output |
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| Inverter |
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| L1 |
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| i | L1 |
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| L2 |
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| L2 |
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| EarthingProtectiveConductor | L3 |
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| L3 |
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| u |
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| u | u |
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| M |
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| Main |
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| inverter |
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| N |
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| N |
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| E |
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| PE |
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| Main Protective Earthing Terminal |
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| PE |
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| PE |
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| + | - | + | - |
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| Battery 1 |
| Battery 2 |
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Suitable earth electrode: RA x | Ia | < 50V | Battery |
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breaker |
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| Q8 |
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With reference to IEC | § 413.1.4.2 | box Q7 |
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| PE |
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| Battery |
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| rack |
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| Battery 1 |
| Battery 2 |
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| PE |
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