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2.4
Electrical Connections
Connection by a qualified electrician is recommended.
The 3 litre models are designed for single phase electrical supplies with or without neutral. Larger
models are designed for 3-phase use.
The voltage or range of voltages on which the furnace may be operated is given on the furnace
rating label. Check that the supply voltage is compatible with the voltage on the label, and that the
current capacity is sufficient for the amperage on the label, before connection to the supply. A
table of the most common ratings is given in section 8.1 of this manual.
Supply cables may be fitted to special order; when fitted, supply-rated fuses are internally fitted,
and the cable may be directly wired to an isolator or fitted with a line plug. Where no supply cable
is fitted there are no internal supply-rated fuses, and a permanent connection should be made from
a fused and isolated supply to the internal terminals after temporary removal of the furnace back
panel.
The supply point must be within reach of the furnace operator and must incorporate either an
isolating switch which operates on both conductors (single phase) or on all live conductors
(two/three phase), or a quickly removable plug.
The supply MUST incorporate an earth (ground).
CONNECTION DETAILS
Supply
1-phase
supply
3-phase
DO NOT connect a furnace ordered for three phase use to a single phase supply or to the wrong
type of three phase supply.
3.0
MF23
Terminal label
Cable colour
L
Brown
N
Blue
PE
Green/Yellow
Terminal label
Cable colour
L1
Black
L2
Black
L3
Black
N
Light Blue
PE
Green/Yellow
supply type
Live-Neutral
Reversible or Live-Live
To live
to either power conductor
To neutral
to the other power conductor
To earth (ground)
to earth (ground)
to phase 1
to phase 2
to phase 3
to neutral except delta
to earth (ground)
BLF
5
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