double insulation symbol
 

i got a desk lamp from ebay like the one in the image link below. the
bulb is held up by two adjustable telescopic rods, exactly the same
type as you would find on the aerial of a FM radio. they are metal.

i saw the double insulated symbol on the bottom, which go me thinking.
how did they get the wiring through these rods double insulated, they
are pretty thin. then i examined the rods. they had joints in them.
they werent even hollow! there was no wiring. they were the
conductors.

a quick check with the meter gave 20V AC. thats how it was designed
to light the bulb .

my question is can you have the double insulated symbol on a product
with exposed 20V AC conductors?



http://www.flickr.com/photos/31506127@N03/3033028166

double insulation symbol
 

On Sat, 11 Dec 2010 06:19:40 -0800, s rearranged some electrons to say:

i got a desk lamp from ebay like the one in the image link below. the
bulb is held up by two adjustable telescopic rods, exactly the same type
as you would find on the aerial of a FM radio. they are metal.

i saw the double insulated symbol on the bottom, which go me thinking.
how did they get the wiring through these rods double insulated, they
are pretty thin. then i examined the rods. they had joints in them. they
werent even hollow! there was no wiring. they were the conductors.

a quick check with the meter gave 20V AC. thats how it was designed to
light the bulb .

my question is can you have the double insulated symbol on a product
with exposed 20V AC conductors?



http://www.flickr.com/photos/31506127@N03/3033028166

Yes. Google - SELV

double insulation symbol
 

On 11/12/2010 14:19, s wrote:
i got a desk lamp from ebay like the one in the image link below. the
bulb is held up by two adjustable telescopic rods, exactly the same
type as you would find on the aerial of a FM radio. they are metal.

i saw the double insulated symbol on the bottom, which go me thinking.
how did they get the wiring through these rods double insulated, they
are pretty thin. then i examined the rods. they had joints in them.
they werent even hollow! there was no wiring. they were the
conductors.

a quick check with the meter gave 20V AC. thats how it was designed
to light the bulb .

my question is can you have the double insulated symbol on a product
with exposed 20V AC conductors?



http://www.flickr.com/photos/31506127@N03/3033028166


Very easy, the 20V is supplied from a transformer, (which must meet
the primary/secondary isolation standards).

Jeff