About 28,000 Tu-Wire ballasts used with dimmable compact fluorescent lights are being recalled by the manufacturer, Lutron Electronics Co.

The company said that the ballasts, if not properly grounded, can present a risk of electric shock to persons who come in contact with the ballast or with a light fixture that incorporates the ballast, such as when a consumer changes a fluorescent lamp bulb.

No injuries have been reported.

The recalled ballast is used to dim compact fluorescent lighting fixtures. The ballasts are not visible once installed. The ballasts were included with light fixtures sold under numerous brand names.

The recalled ballasts were sold at light fixture manufacturers, electrical distributors and electrical contractors nationwide from July 1998 through May 2006 for about $120.

Consumers should not touch the fixtures since they could pose a shock hazard.

Consumers should contact Lutron Electronics to arrange for free replacement of the recalled ballasts.

Consumers can contact Lutron Electronics at 866-793-4270 anytime, or visit the firm’s Web site for more recall information.