IM-P408-04
EMM Issue 7
21
B850-W and B850-P Boiler House Energy Monitor
9.2 Important -
Please read the following general mains wiring notes:
1.
The wiring connections are identified on the label inside the terminal cover of the
wall mounting version.
2.
Fuses should be installed in all live conductors.
Disconnect device conforming to IEC 60947-1 and IEC
60947-3 or UL 60947-1 and UL 60947-3
L
N
L1
L2
240/100 Vac from
supply
1 A fuses
Single phase supply with neutral at earth potential
3.
Double or reinforced insulation must be maintained between:
-
Hazardous live conductors (mains and relays circuits)
and
-
Safety extra low voltages
(All other components/connectors/conductors).
4.
The wiring diagrams show relays and switches in the power off position.
Mains and signal wiring:
For cable/wire recommendations see IM-P408-03 Boiler House Energy Monitor
Installation and Maintenance Instructions.
Screen connection
An earth current loop is created if a wire or screen is connected between two earth
points, which are at different potential (voltage). If the instructions are followed
correctly, then the screen will only be connected to the earth at one end.
The earth terminal is a functional earth rather than a protective earth.
A protective earth provides protection from electric shock under a single fault
condition. This product has double insulation and therefore does not require a
protective earth. A functional earth is used in order for the product to operate. In this
application, the earth is used as a sink or drain for any electrical interference. The
screens must be connected to the earth terminal in order to conform to the EMC
directive.
Disconnect device conforming to IEC 60947-1 and IEC
60947-3 or UL 60947-1 and UL 60947-3
L
N
L
N
1 A fuse
B850-W
240/100 Vac from
supply
B850-W