What are the "conditions" that have to be met to be able to install alcohol-based hand rub (ABHR) dispensers in egress corridors?

Any examples are for illustrative purposes only. 

Alcohol-based hand rub (ABHR) gel dispensers can be installed in egress corridors as follows:

• The corridor width is 6 feet or greater
• Dispensers are installed no less than 4 feet apart (horizontal spacing)
• Dispensers are not installed directly above an electrical outlet or switch
• Dispensers are not installed less than 1 inch adjacent to an electrical outlet or switch 
• Dispensers installed directly over carpeted surfaces are permitted only in sprinklered smoke compartments
• ABHR does not contain more than 95 percent alcohol content by volume
• Operation of the dispenser complies with NFPA 101-2012: 18/19.3.2.6(11)
• Each smoke compartment may contain a maximum aggregate of 10 gallons (37.8 liters) of ABHR gel, in dispensers and a maximum of 5 gallons (18.9 liters) in storage
• Maximum individual dispenser fluid capacity is 0.32 gallons (1.2 liters) for dispensers in rooms, corridors, and areas open to corridors
• Maximum dispenser size for individual dispensers in areas designated as suites of rooms is 0.53 gallons (2.0 liters)
• And also with other requirements contained in NFPA 101-2012: 18/19.3.2.6

Where aerosol containers are used:

• Maximum capacity of the aerosol dispenser is 18 ounces (0.51 kg) and limited to Level 1 aerosols defined by NFPA 30B
• A maximum of 1135 ounces (32.2 kg) of Level 1 aerosols, or a combination of gel and Level 1 aerosols not to exceed, in total, the equivalent of 10 gallons (37.8 L) in use in a single smoke compartment

Hand wipe containers are not included in the 10-gallon limit per smoke compartment.  These products may not contain alcohol, and some may not list the alcohol content.  Caution should be used when adding hand wipes to areas as they are still a potential addition to the combustible fire load.  Depending on the disinfecting ingredient, the hand wipes could be reviewed as a hazardous chemical; the SDS should be reviewed and appropriate actions taken.  A risk assessment while not required, is recommended as a best practice.

Reference NFPA 101-2012: 18/19.3.2.6