Omega WI8XX-U - Manual (Page 17)

2.1.5 Electrical Installation
2.1.5.1 Power Connections
Warning: Do not connect ac power to your meter until you have
completed all output connections. This meter must only be installed by a
specially trained electrician with corresponding qualifications. Failure to
follow all instructions and warnings may result in injury!
Connect the main power connections as shown below.
Figure 2.7 Main Power Connections
Table 2.3 Fuse Requirement (See Specifications Section)
For the low voltage power option, in order to maintain the same degree of
protection as the standard high voltage input power units (90 - 240 Vac),
always use a Safety Agency Approved DC or AC source with the same
Overvoltage Category and pollution degree as the standard AC unit (90 -
240 Vac).
The Safety European Standard EN61010-1 for measurement, control,
and laboratory equipment requires that fuses must be specified based on
IEC127. This standard specifies for a Time-lag fuse, the letter code “T”.
The above recommended fuses are of the type IEC127-2-sheet III. Be
aware that there are significant differences between the requirements
listed in the UL 248-14/CSA 248.14 and the IEC 127 fuse standards. As a
result, no single fuse can carry all approval listings. A 1.0 Amp IEC fuse is
approximately equivalent to a 1.4 Amp UL/CSA fuse. It is advised to
consult the manufacturer’s data sheets for a cross-reference.
FUSE Connector Output Type For 115Vac For 230Vac DC
FUSE 1 Power N/A 100 mA(T) 100 mA(T) 100 mA(T)
FUSE 2
Power
N/A N/A N/A 400 mA(T)
24 Vac or
20 to 36 Vdc
90 to 240 Vac 110 to 375 Vdc
OR
11
Use copper
conductors only for
power connections