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Amendment

This document, together with IEC 61643-01, is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages.

These devices are intended to be connected to the DC side of photovoltaic installations rated up to 1 500 V DC. Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.

SPDs complying with this standard are exclusively dedicated to be installed on the DC side of photovoltaic generators and the DC side of PV inverters.

SPDs for PV systems with energy storage (e.g. batteries, capacitor banks) are not covered in this standard.

SPDs with separate input and output terminals that contain specific series impedance between these terminal(s) (so called two-port SPDs according to IEC 61643-01) are not covered.

SPDs compliant with this standard are designed to be permanently connected, where connection and disconnection of fixed SPDs can only be done using a tool. This standard does not apply to portable SPDs.

NOTE 1 In general SPDs for PV applications do not contain a specific series impedance between the input/output terminals due to power efficiency considerations.

NOTE 2 Wherever reference is made to the electric power system or the power system within this document, this refers to the DC side of the photovoltaic installation.

Replacement:

This International Standard applies to the basic safety and essential performance of CT scanners, hereafter also referred to as me equipment.

If a clause or subclause is specifically intended to be applicable to me equipment only, or to me systems only, the title and content of that clause or subclause will say so. If that is not the case, the clause or subclause applies both to me equipment and to me systems, as relevant.

NOTE 1 See also 4.2 of the general standard.

The scope of this document is limited to CT scanners intended to be used for head and/or body imaging characterised by an enclosure of the X-ray source(s) and imaging detector(s) in a common protective cover in the shape of a toroid. It includes safety requirements for the X-ray generators used in CT scanners, including those where high-voltage generators are integrated with an X-ray tube assembly.

NOTE 2 This standard does not intend to address interventional systems as described in IEC 60601-2-43 and cone-beam CT scanners integrated into a radiotherapy systems as described in IEC 60601-2-68 and dental cone-beam CT scanners as described in IEC 60601-2-63.

NOTE 3 The body includes cardiac, extremities, neck, etc.

The scope of this International Standard excludes radiotherapy simulators and systems where the image is created by a source other than an X-ray tube.

Amendment