User Guide
Landcal Blackbody Source
Type R1500T
Page 5
4 Electrical Supply
4.1 Electrical connections
A suitable single phase a.c. electrical supply with earth (ground) will be
necessary. The supply may be live to neutral non reversible, live to neutral
reversible or live to live. The furnace must be connected to the electrical supply
for which it was ordered. Details of the voltage, current and frequency required
are stated on the furnace plate attached to the furnace. The supply point must
be within reach of the operator and must incorporate either an isolating switch
or a quickly removable plug.
If the furnace is supplied with a mains cable tted then it may be wired directly to
an isolator or tted with a line plug. Supply rated fuses will be internally tted.
If the furnace is supplied without a mains cable, the specication for suitable
cable for 220/240V operation is:
300/500 volt, PVC insulated 3 core cable. Each core 4mm ² for 110/120V
operation.
300/500 volt, PVC insulated 3 core cable. Each core 2.5mm ² for 220/240V
operation.
The colour code for the cable is:
Brown lead Live
Blue lead Neutral
Green Yellow lead Earth (ground)
As no internal supply rated fuses are tted, a permanent connection to an
appropriately fused and isolated supply must be made to the internal terminals
after temporary removal of the furnace panel.
4.2 Fuses
Refer to the circuit diagram, Fig. 2.
F1 Internal supply fuses are only tted if a mains cable is tted. The supply to
the furnace should be fused to the same rating.
110/120V 40 amp fuse
220/240V 25 amp fuse
F2 Instrument circuit fuses 32mm x 5mm glass, 2 amp
F3 Heat light fuses 32mm x 5mm glass, 2 amp
Not tted for 220/240V operation
Fitted for 110/120V operation
4.3 Earth leakage
Warning
It is recommended that this furnace is not used in conjunction with an
earth leakage trip switch. At elevated temperatures all ceramic materials
become slightly conductive. This may mean that at temperatures
above 1000°C a leakage current in excess of 30 milliamps is present.
This will cause an earth leakage trip switch to activate.
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