The rapid growth of 12 volt
outdoor lighting using plastic stakes should make safety
a great concern to consumers. Plastic ground stakes used
to support 12 volt metal outdoor lighting fixtures are a
devastating accident waiting to happen!
My transformer campaign for
fire prevention a few years back has been credited with
forcing the industry to change transformer design to a safer
design in use today. I am compelled to take the industry
to task for the use of plastic stakes. Yes, they are cheaper
also durable. The problem with using plastic is it’s
insulating qualities. Placing a metal electrical fixture
in a plastic stake isolates the fixture from the earth (electrical
ground). In the event that a live current carrying wire
touched the metal fixture the entire fixture would become
a source for a severe electrical shock.
Being deeply involved in
the industry for almost a half century gives me the knowledge
and experience to speak out. I'm concerned about the future
of our industry. However, I am more concerned about the
possibility of a single fatal accident caused by using a
plastic stake.
How could this happen you ask? After all we are only dealing
with 12 volts and UL says that 15 volts or less is OK. The
heart of any 12 Volt system is the transformer, the item
that reduces 120 Volt household electricity to a safe 12
Volt. The transformer is an electrical device containing
two coils of copper wire, one for the 120 Volt while the
other is isolated for the 12 Volt.
In the event of a lighting
strike or power surge causing one of the 120 Volt wires(within
the transformer) to touch one of the 12 volt wires the transformer
could continue to provide 12 Volt for the fixtures. However
from the 12 volt wires to ground (earth) the voltage would
be a deadly 120 Volt.
Should the installing mechanic
accidentally remove a small section of insulation from the
12 Volt wire allowing the bare wire to touch the metal fixture
support, instantly the fixture becomes electrified with
120 Volt to ground. The 12 Volt lamp will continue to burn
even though the fixture surface is charged with deadly 120V
to ground making it possible for the unsuspecting to receive
a deadly shock.
Because the accidentally
skinned wire is touching the metal fixture stem the metal
parts become dangerously charged with 120 Volts. Should
a person not knowing the danger of this 120 Volt be kneeling
on the wet ground ( knees touching the wet ground) use the
12 Volt fixture as an assist to "getting up" they
would be subject to a full 120V AC, far greater than the
deadly 100 Milliamps, the minimum for possible electrocution.
Had a metal spike been used
the scenario would be entirely different, it would have
been SAFE! When the skinned wires from the fixture were
inserted into the metal spike and then placed in the ground
(earth), as the electricity was applied to the fixture immediately
a fuse, circuit breaker or the GFCI would have interrupted
this dangerous 120 Volt.
I invite you in public service,
professionals that are installing 12V AC outdoor lighting,
Wholesale/retail businesses that are selling 12V (low voltage)
outdoor lighting. E-mail
me to receive a CD of a real live demonstration which
will show you the need for a 12V AC installations either
existing or new to be grounded at each individual fixture,
either by metal spike or some other approved method. We
do not need one single person maimed or killed "because
it is cheaper".
This is the “Shocking
Truth”.