lots
They are not at all. The danger all comes from the operator.
Keeping his/her vessel and crew out of danger
The DANGER tag is a red tag. They are used to prevent the operation of equipment that could jeopardize your safety or endanger the equipment systems or components. Under no circumstances will it be operated.
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and crew out of danger
Keeping his/her vessel and him/herself out of danger
It is not clear who specifically warned the oncoming train of danger ahead as the situation may vary. In some cases, it could be a signal operator, a bystander, or another train operator. The specific circumstances and individuals involved would determine who issued the warning.
Well it looks like you are going to have to wait to play with the equipment. He can't come out today because he is grounded. But really, if it is grounded then the equipment is not going to electrocute you. You need to ground they equipment. If it is ungrounded then there is danger
An oxygen concentrator takes oxygen from the air we all breathe and concentrates it. Unlike a tank of concentrated oxygen it has little risk of causing an explosion or a fire. In fact oxygen concentrators are the preferred system for rescue personell because there is far less danger to the operator.
The primary responsibility for a vessel operator assisting a boat in distress is keeping his/her vessel and him/herself out of danger.