P54x/EN SS/H11 Safety Section
(SS) - 8
6. TECHNICAL SPECIFICATIONS FOR SAFETY
Unless otherwise stated in the equipment technical manual, the following data is applicable.
SS
6.1 Protective fuse rating
The
recommended maximum rating of the external protective fuse for equipments is 16A,
high rupture capacity (HRC) Red Spot type NIT, or TIA, or equivalent. The protective fuse
should be located as close to the unit as possible.
DANGER - CTs must NOT be fused since open circuiting them may
produce lethal hazardous voltages.
6.2 Protective class
IEC 60255
-27: 2005 Class I (unless otherwise specified in the
equipment documentation).
EN 60255-27: 2005 This equipment requires a protective
conductor (earth) connection to ensure user safety.
6.3 Installation category
IEC 60255-27: 2005
Installation category III (Overvoltage Category III):
EN 60255-27: 2005 Distribution level, fixed installation.
Equipment in this category is qualification tested at
5 kV peak, 1.2/50 µs, 500 , 0.5 J, between all
supply circuits and earth and also between
independent circuits.
6.4 Environment
The equi
pment is intended for indoor installation and use only. If it is required for use in an
outdoor environment then it must be mounted in a specific cabinet of housing which will
enable it to meet the requirements of IEC 60529 with the classification of degree of
protection IP54 (dust and splashing water protected).
Pollution Degree - Pollution Degree 2 Compliance is demonstrated by reference to safety
Altitude - Operation up to 2000m standards.
IEC 60255-27:2005
EN 60255-27: 2005
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