In October of last year the Land Transport Safety Authority in New Zealand (who regulate on duty hours for those whose jobs involve driving) changed the maximum work period to no more than 5 1/2 hours then a 30 min break with a maximum of 13 hours in a 24 hour period and a 10 hour stand down.
The crews in some parts of St. John's central region (ie. Otaki) run a 3x3 roster. This is 7am-6pm day one, 7am-6pm day two, on call 6pm-7am then 6pm-7am day three. This 24 hour block on day three places them well outside the driving regulations. Therefore, there comes a point that they can no longer work. Fines are large and can be handed out to individuals and companies.
Additionally the Ambulance Officer (AO) is often single crewed in this area with the nearest backup being upwards of 45minutes away. An increasing problem in some areas is the only help for the AO for lifting or driving is the volunteer fire brigade who, rightly so, get miffed about having to take time off work (unpaid) to perform the work of another service.
In Wellington, where the ambulance service is provided by Wellington Free Ambulance (WFA), fire is only used for lifting assistance where the patient is exceptionally large (requiring 4+ people) and for CPR assistance at arrests.
With regards to Fire/Ambulance roles, Fire puts out fires, cuts people from things, and does CPR. Very occasionally will they provide a first response. Their training ranges from a 2 day first aid course to a 4 day advanced first aid course.
Ambulance services are provided by private, non-profit companies contracted by the Ministry of Health. Training varies, but WFA is in the process of transitioning to a 3 year undergrad degree. Most new staff have it, and many existing staff are working towards it.
In general, there is a very good relationship between fire and ambulance, especially when they invite us over for cake and scones.