low voltage dimmer

[Bobhook149]

why can't you use a regular dimmer sometimes?

 

[Dennis Alwon]

On some electronic low voltage dimmers you can use a standard dimmer. Why? That's a question for the geek squad. :grin:

 

[StephenSDH]

On some magnetic low voltage lights you can use a standard dimmer. Why? Another question for the geek squad.


"To control transformer, install ON/OFF switch or good quality
line voltage dimmer on 120V side of transformer."
-Seagull Lighting Magnetic Transformers

 

[infinity]

Here's some good info from Lutron about dimming LV fixtures:

http://www.lutron.com/applicationnotes/362219b.pdf

Here's an excerpt:

Dimming Magnetic Transformers
Why Use Lutron Magnetic Low-Voltage
Dimmers?
Magnetic transformers are inductive loads and are
sensitive to DC voltages. A magnetic transformer
subjected to DC voltage can overheat.
Do not use regular incandescent dimmers for
magnetic low-voltage lighting. Regular incandescent
dimmers often contain a small amount of DC voltage,
which is harmless to a regular incandescent load but
may damage magnetic transformers. Lutron MLV
dimmers are specifically designed to prevent DC
voltage from being applied to the transformer.