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ELECTRICAL CONNECTIONS
Electric Boilers
The supply cable to the boiler should be of sufficient size to carry the load capacity required. It should be wired
through a linked isolator switch with minimum contact gaps of 3mm in every pole, and the system protected by
a suitably rated circuit breaker.
It is essential that the boiler is properly earthed, and the wiring tested to current IEE regulations.
The following table shows the specification for the full selection of Strom Boilers, please check carefully your
model and read off from the table below. Calculations should always be done to ensure that the information is
correct for your circumstances, as variences in installations can change the breaker size and or cable size, for
instance voltage varies from property to property and does not necessarily follow any regional variences.
Rated Boiler Output
7kW
11kW
14.4kW
18kW
21kW
24kW
Single / Three Phase
Single
Single
Single
Three
Three
Three
Rated Voltage
230VAC
230VAC
230VAC
400VAC
400VAC
400VAC
Current (A) @ Rated Voltage
32
55
63
27.3
31.8
36.4
Minimum MCB/RCB (A)
40
63
63
32
40
40
Minimum Cable Size (mm
2
)
4
10
10
3 x 4.0
3 x 6.0
3 x 6.0
The terminal connection block is at the top right-hand side of the boiler and is accessible via the removal of the
front panel. The supply cable should be safely routed to this point through the cable entry point at the top of the
right-hand panel of the boiler.
Ensure the connection cables are correctly wired into the correct terminals and are securely in position.
POWER SUPPLY:
CABLE TYPE:
For ease of installation Strom always recommend a multi strand high temperature flexible cable such as HO7
cable, please consult your electrical distributor, and always make sure that size of cable is correct for the number
of amps used as different cables can have different ratings at different core sizes.
