Kamstrup ULTRAFLOW 54 DN150-250, Техническое описание, Страница: 25 / 64

TECHNICAL DESCRIPTION ULTRAFLOW
®
54 DN150-250
5512-876 GB/04-2012/Rev. F1
25
230/24 V safety transformer
The 24 VAC module is especially suited for installation together with a
230/24 V safety transformer, e.g. type 66-99-403, which can be
installed in the main electrical panel before the safety relay. When the
transformer is used, the total power consumption of the meter incl.
the 230/24 V transformer will not exceed 1.7 W.
Figure 12
7.6.3 Mains supply cable
ULTRAFLOW
®
54 is available with mains supply cable H05 VV-F for either 24 V or 230 V (l=1.5 m):
Figure 13. Mains cable (2x0.75 mm²), max. 6 A fuse.
”H05 VV-F” is the designation of a strong PVC mantle, which withstands max. 70
°
C. Therefore, the mains cable
must be installed with sufficient distance to hot pipes etc.
7.6.4 Danish regulations for the connection of mains operated meters
Installation of mains connected equipment for registration of consumption ( www.sik.dk , SIK electric installation
notification 27/09, February 2009).
The consumption of energy and resources (electricity, heat, gas and water) of the individual consumer is to an
increasing extent registered by electronic meters, and often equipment for remote reading and remote control of
both electronic and non-electronic meters is used.
General regulations for carrying out installations must be observed. However, the following modifications are
permitted:
•
If meter or equipment for remote reading or remote control is double-isolated it is not necessary to run the
protective conductor to the connection point. This also applies if the connection point is a plug socket
provided that it is placed in a canning which is sealable or can be opened with key or tool only.
If meter or equipment used for remote reading and remote control is connected to a safety transformer mounted in
the panel and direct connected to the branch conductor, no on-off-switch or separate overcurrent protection in
either primary or secondary circuit is required, provided that the following conditions are fulfilled:
•
The safety transformer must either be inherently short-circuit-proof or fail-safe
•
The conductor of the primary circuit must either be short-circuit-protected by the overcurrent protection of
the branch conductor or short-circuit safely run.
•
The conductor of the secondary circuit must have a cross section of at least 0.5 mm² and a current value
which exceeds the absolute maximum current deliverable by the transformer
•
It must be possible to separate the secondary circuit, either by separators, or it must appear from the
installation instructions that the secondary circuit can be disconnected at the transformer’s terminals