Posted May 21st, 2018, 02:41 PM
Normally yes, but would you touch a metal-cased power tool lacking an earth lead?
Who said there is no earth lead? Most (the exception being some older ships) cruise ship, or cargo ship outlets, whether 110v or 220v are three wire (two power leads and a ground), and three prong (even the 220v outlets, if you look carefully, will have two metal prongs on the circumference which are ground pins). People misunderstand the difference between a ground circuit on a ship and a ground circuit on land. Other people misunderstand and think there is no
ground on a ship, but there is a very large and effective one, the hull
. The only difference is that the "neutral" or "white" lead is not connected to the ground at the circuit breaker box like on land.
Think of the 110v (and the shipboard 220v as well) circuit on a ship as being the same as your electric range or water heater. It is connected to the two power leads coming into your house (to provide the 220v), and to the ground lead for safety. Yet, each power lead is not at the ground potential (just like a ship), unlike the 110v wiring in your house. I know that ranges typically also have a neutral wire to provide the 110v for controls, so lets just concentrate on a water heater. Is the water heater unsafe? Nope, because the metal casing is connected to ground, but without a ground fault
, there is no connection
between the two power leads and ground. Yet, if the water heater goes to ground, it won't shock you because the metal case and the ground wire provide a better path for current than through you to the earth. And, likewise, the circuit breaker is two pole, so any ground fault current will likely trip both power legs.
Almost every power strip I've seen has a three prong plug on it (and that does not imply surge protection). Now, if you want to plug this three prong power strip into an older two prong outlet, with a plug adapter, and decide not to use the screw tab to complete the ground, then you are creating a dangerous situation, but that is a different thing, and not caused by using a power strip with only a single pole breaker on a ship.
Again, the switch on a power strip has nothing to do with the safety of using it on a ship. Pilot lights on power strips have nothing to do with their safety on a ship. The words "surge protected", "joules of protection", "clamping voltage" are the keys to what is unsafe on a ship. If those words are not present on the packaging or the power strip itself (the fine print on the back), then the power strip is safe to use
, but it may still be banned from use by cruise line policy.
This confusion over what a non-surge protected power strip is, is why many cruise lines simply ban them altogether, rather than have the port security people trained to detect, or argue about whether the power strip is safe or not.
I would not recommend using a power strip anyway for charging a scooter as well as running a CPAP and oxygen concentrator, all night, unless you checked the amperage rating of the power strip and compared it to the max current draw of all your equipment together, especially the scooter charger.