Videotec NXPTZT - Manual (Page 8)

EN - English - I
nstruc
tions manual
8 MNVCNXPTZT_1343_EN
• Never, under any circumstances, make any
changes or connections that are not shown in
this handbook. Improper use of the appliance
can cause serious hazards, risking the safety of
personnel and of the installation.
• Use only original spare parts. Non-original spare
parts could cause fire, electrical discharge or other
hazards.
• Before proceeding with installation check the
supplied material to make sure it corresponds
to the order specification by examining the
identification labels (4.2 Product markings, page
11).
• This device was designed to be permanently
installed on a building or on a suitable structure.
The device must be installed permanently before
any operation.
• Use a Class 2 listed UL tranformer, compliant with
the Standards in force, only for products marked
UL, powered at 24Vac.
• A disconnecting device, readily and easily
accessible, must be incorporated in the electrical
system of the building for rapid intervention.
• Installation category (also called Overvoltage
Category) specifies the level of mains voltage
surges that the equipment will be subjected to.
The category depends upon the location of the
equipment, and on any external surge protection
provided. Equipment in an industrial environment,
directly connected to major feeders/short branch
circuits, is subjected to Installation Category III. If
this is the case, a reduction to Installation Category
II is required. This can be achieved by use of an
insulating transformer with an earthed screen
between primary and secondary, or by fitting
listed Surge Protective Devices (SPDs) from live
to neutral and from neutral to earth. Listed SPDs
shall be designed for repeated limiting of transient
voltage surges, suitable rated for operating voltage
and designated as follows: Type 2 (Permanently
connected SPDs intended for installation on the
load side of the service equipment overcurrent
device); Nominal Discharge Current (In) 20kA min.
For example: FERRAZ SHAWMUT, STT2240SPG-CN,
STT2BL240SPG-CN rated 120/240Vac, (In=20kA).
Maximum distance between installation and
reduction is 5m.