Hi Alan:
> We have recently had an EN60950 safety report from a local consultant on a
> piece of IT equip we designed which commented that a fuse may be required
> on both the live and neutral of the mains input for certain countries in
> Europe.
EN 60950, Sub-clause 2.7.1 states:
"Protection in PRIMARY CIRCUITS against overcurrents, short
circuits and earth faults shall be provided, either as an
integral part of the equipment or as a part of the building
installation, subject to the following, a), b), c), and d):
.
.
.
.
"d) If reliance is placed on protection in the building
installation, the installation instructions shall comply
with 1.7.11, except that for PLUGGABLE EQUIPMENT TYPW A
the building installation shall be regarded as providing
protection in accordance with the rating of the wall
socket outlet and 1.7.11 does not apply."
Consequently, the product may rely on the building installation
for earth faults and need not have double-pole fusing.
This requirement applies to CENELEC countries. Other European
countries MAY have different requirements. Hence, your local
consultant was quite astute and responsible to point this out to
you in his report.
> Does everybody else fit a single pole fuse? I'd appreciate your comments.
We use one fuse. We do not know of any European countries that
double-pole fusing for single-phase equipment rated up to 16 A.
Best regards,
Rich
-------------------------------------------------------------
Richard Nute Product Safety Engineer
Hewlett-Packard Company Product Regulations Group
AiO Division Tel : +1 858 655 3329
16399 West Bernardo Drive FAX : +1 858 655 4979
San Diego, California 92127 e-mail: [email protected]
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