Which bacterial cultures are not dangerous for human handling in lab?

 I want to know which bacterial cultures are not dangerous for human handling in lab?

Anyone having this knowledge?

 There are lot many bacterial strains that are not harmful, even they are beneficial for us. For example, one can find lot many bacterias growing on our skin. in our gut. Detailed information can be accessed at http://en.wikipedia.org/wiki/Human_flora

Most bacterial cultures typically used in a standard research laboratory are not harmful to a human being. The fact that you are using protective equipment (gloves, etc) when handling these cultures makes them truly not harmful.

If you are looking for bacteria that can be harmful to humans, look at biological safety level laboratories (BSL2, 3 and 4). If a bacteria is listed under one of these safety level laboratories, then it is harmful to humans and special precautions are required for their use. 

http://www.unh.edu/ehs/pdf/UNH-BSL-2-Pamphlet.pdf here is the information for bio Safety Level 2

Ivan is right in telling about these levels and safety precautions.

Lactic acid bacteria. They come under GRAS (Generally recognized as safe ) status, FDA. 

A very good tutorials for biosafety levels is given on wikipedia at http://en.wikipedia.org/wiki/Biosafety_level

There it has been given about the various BSLs:-

Biosafety level 1: It includes several kinds of bacteria and viruses including canine hepatitis, Escherichia coli, as well as some cell cultures and non-infectious bacteria.

Biosafety level 2: It includes various bacteria and viruses that cause only mild disease to humans, or are difficult to contract via aerosol in a lab setting, such as C. diff, hepatitis A, B, and C, influenza A, Lyme disease, dengue fever, Salmonella, mumps, Bacillus subtilis, measles, HIV,  scrapie, MRSA, VRSA,etc.

Biosafety level 3: It includes various bacteria and viruses that can cause severe to fatal disease in humans, but for which vaccines or other treatment exist, such as Mycobacterium tuberculosis,Bacillus anthracis, West Nile virus, Venezuelan equine encephalitis virus, Eastern equine encephalitis virus, Hendra virus, SARS coronavirus, Salmonella typhi, Coxiella burnetii, Rift Valley fever virus, Rickettsia rickettsii, and yellow fever virus.

Biosafety level 4: This level is required for work with dangerous and exotic agents that pose a high individual risk of aerosol-transmitted laboratory infections, agents which cause severe to fatal disease in humans for which vaccines or other treatments are not available, such as Bolivian and Argentine hemorrhagic fevers, Marburg virus, Ebola virus, Lassa fever, Crimean-Congo hemorrhagic fever, and other various hemorrhagic diseases.