General instructions
8 NXAIR / ≤ 40 kA 110-0084.9 / 15
2.4 Personal protective equipment (PPE)
The personal protective equipment must be determined by the switchgear operator depending on the work to
be performed at the switchgear and on the IAC classification of the switchgear. To select the personal
protective equipment, the local laws and regulations, among others, must be complied with.
If covers are opened or removed from a switchgear in operation, the IAC classification according to IEC
62271 Part 200 is no longer fulfilled. The switchgear operator must take this into account when selecting
personal protective equipment. In case of internal arc, full personal protection is then not provided, even if
the personal protective equipment is worn.
3 Due application
The air-insulated medium-voltage switchgear type NXAIR is a type-tested and metal-clad switchgear for indoor
installation, with type of accessibility A and internal arc classification (IAC): IAC A FLR ≤ 40 kA 1 s or IAC
A FL ≤ 40 kA 1 s according to IEC 62271 Part 200.
The switchgear can be used as indoor installation according to IEC 61936 (Power Installations exceeding
AC 1 kV) in lockable electrical service locations. A lockable electrical service location is a room or a place that
is exclusively used for installing electrical equipment and which is kept under lock and key. Access to such a
room is restricted to skilled electricians.
In the basic version, the degree of protection of the enclosure of NXAIR medium-voltage switchgear is IP3XD
according to IEC 60529.
When the switchgear is operated within the technical parameters defined in these instructions, the air-insulated
switchgear type NXAIR is suitable for rated voltages up to U
r
≤ 17.5 kV and a maximum rated short-time
withstand current of I
k
= 40 kA.
The circuit-breaker to be used in a circuit-breaker panel must only be the Siemens type 3AE.
The air-insulated medium voltage switchgear type NXAIR is suitable for operational switching of AC circuits in
transformer substations of public power supply systems or in industrial plants.
The medium-voltage switchgear NXAIR is available with the panel types:
• Circuit-breaker panel
• Disconnecting panel
• Metering panel
• Contactor panel
• Busbar current metering panel
• Bus sectionalizer
• Busbar connection panel
• Switch-disconnector panel
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