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12.3.4.2. Connecting Requirement
• The equipment's power supply 1 complies with IEC/EN 61000-3-12 provided that the short-circuit power S
sc
is greater than or
equal to 787.57kW (for WH-SDC12C6E5/UD12CE5**, WH-SDC14C6E5/UD14CE5** and WH-SDC16C6E5/UD16CE5**) at the
interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with
a short-circuit power S
sc
greater than or equal to 787.57kW.
• This equipment's power supply 1 shall be connected to a suitable supply network, with the following maximum permissible
system impedance Z
max
at the interface for models:
WH-SDC12C6E5/UD12CE5**, WH-SDC14C6E5/UD14CE5** and WH-SDC16C6E5/UD16CE5**: 0.244Ω.
Please liaise with supply authority to ensure that the power supply 1 is connected only to a supply of that impedance or less.
• The equipment's power supply 2 complies with IEC/EN 61000-3-12.
• This equipment's power supply 2 shall be connected to a suitable supply network, with the following maximum permissible
system impedance Z
max
at the interface for models:
WH-SDC12C6E5/UD12CE5**, WH-SDC14C6E5/WH-UD14CE5** and WH-SDC16C6E5/UD16CE5**: 0.236Ω.
Please liaise with supply authority to ensure that the power supply 2 is connected only to a supply of that impedance or less.
• This equipment’s power supply 3 complies with IEC/EN 61000-3-12.
• This equipment’s power supply 3 shall be connected to a suitable supply network, with the following maximum permissible
system impedance Z
max
at the interface for models:
WH-SDC12C6E5/UD12CE5**, WH-SDC14C6E5/UD14CE5** and WH-SDC16C6E5/UD16CE5**: 0.464Ω.
Please liaise with supply authority to ensure that the power supply 3 is connected only to a supply of that impedance or less.
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