Safety
Consider
safety at the design stage:
+
Keep power devices and junctions away and/or above any potential water
spillages/ floods.
+
Determine whether the electrical lines can handle the current draw.
+
Where multiple lamps are being lit ensure to stagger start up times. HID
lamps draw large amounts of electricity therefore safety must be a
priority.
+ As
an overall safety measure, install a miniature circuit breaker (MCD) and
residual current device (RCD). If there is a faulty circuit these will cut
the power supply (Fig 6.23).
Calculating electricity costs
Cost of
power per day = Cost of power per kilowatt* x Total kilowatts** x daily
duration.
e.g. If
the cost of power is $0.10 per kW and there are 2 x 600W lamps (1.2kW)
alight for 12 hours per day, the daily cost of electricity is $1.44 (i.e.
$0.10 x 1.2kW x 12hrs)
*Refer
to your last power bill. **1,000 watt = 1 kilowatt (kW)
