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demands of all points of utilisation and where appropriate making allowance for diversity. A note should
be made of the power of any electrical items such as electrical showers, electrical cooker etc. to assist in
diversity calculations.
5. A current limiter is available as an accessory (Part No. 5132431). In most cases it has been found not
to be required, however if required it can be fitted where the diversity and / or incoming fuse rating would
not be sufficient in normal cases. The current sensing accessory will monitor the incoming current to the
consumer unit and at a predetermined level will reduce the current required by the Ambiflo™ Heat Pump
to a maximum 15A (this must be assumed for diversity to be 100%).
Usage
1
Lighting
2
Cooking appliances
3
Water heaters (instantaneous
type)
4
Water heater thermostatically
controlled (Immersion heater)
5
Floor warming installations
6
Thermal storage or space
heating installations
7
Socket-outlets
NOTE: This is an example and a competent electrical engineer should produce their own calculation
based on the latest editions of all regulations.
* consider for discharge lighting power factor, control gear losses, etc ...
** items below 5VA such as shaver points, bell transformer, etc ... can be ignored.
Fig. 14
Example calculations,
Diversity Allowable
66 % of total current demand (see note *)
10 amps + 30% of full load of cooking appliance if in excess of 10 amp,
add an additional 5 amp if socket and outlet incorporated in control unit
100% of the largest load appliance and 100% of 2nd then 25% of full
load of any remaining appliances
No diversity allowed
No diversity allowed
No diversity allowed
100% of amps required for the largest load then 40% of all other uses
(see note **)
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