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Solar Voltaics
411.3.2.2
The maximum disconnection time shown in Table 41.1 applies to circuits not exceeding 32A. 0.4s TN System & 0.2s TT Systems.
551.4.1
Fault protection shall be provided for of each source of supply or combination of sources of supply.
(Also, refer to chapter 55, regulation group 551- LowVoltage Generating Sets)
551.5.1
Over current protection should be located as near as practical to the generator terminals (where required).
712.537.2.1.1
To allow maintenance of the PV Inverter, means of isolating the PV inverter from the DC side and the AC side shall be provided.
(Also, refer to chapter 53, regulation group 537- Isolation and Switching)
712.434.1
The PV supply cable (AC side) shall be protected against fault current by an overcurrent protective device installed at the connection to the AC
mains. Also, refer to Part 7, all regulations in Section 712- Solar Photovoltaic (PV) Power Supply Systems)
712.411.3.2.1.1
The PV Supply cable (on the AC side) shall be connected to the supply side of the protective device for automatic disconnection of circuits
supplying current-using equipment.
314.1
Every installation shall be divided into circuits as necessary to: (ii) facilitate safe inspection testing & maintenance (vi) prevent the indirect
energising of a circuit intended to be isolated.
314.4
In an installation comprising more than one final circuit, each final circuit shall be connected to a separate way in a distribution board.
The wiring of each final circuit shall be electrically separate from that of every other final circuit, so as to prevent the indirect energising of a final
circuit intended to be isolated.
522.6.101 522.6.102 & 522.6.103
Installers must consider the need for Additional Protection by 30mA RCD in accordance with regulations (Previously 522.6.6 & 522.6.8) that
relate to concealed cables in walls & partitions.
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Solar Voltaics in Domestic Installations
Cables with a power supply at each end need special considerations.
Using Double pole RCBOs on a dedicated circuit could be the simplest answer.
PV Ready Consumer Unit
(with DP RCBO & meter)
PV Ready
Consumer Unit
(with meter)
Dual Supply PV
/Main Supply
Switch
Combination DC/AC
PV Isolator
Circuit protection for both power supplies may be required (subject to inverter operating
characteristics)
PV supplies with an RCD providing additional protection for the final circuit must be DP and disconnect
Line and Neutral conductors (e.g. Double pole RCBO). Use of DP RCBOs may negate the need to take
account of inverter shut down times
PV supplies require DC and AC Isolators so that the inverter can be isolated from both supplies for
maintenance
PV supplies should be connected to a dedicated circuit at the consumer unit (not share a final sub circuit)
PV Meters must comply with MID2004/22/EC B&D or B&F
A new range of Wylex products is available to help installers meet the above
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