How best to eval heat risk from AC adaptors

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WHat P=VI values are safe to leave plugged in indefinitely (clock or phone)?

I still remember a 1970s Readers Digest on a fire from a 1950s
telephone adaptor..

- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm http://www.facebook.com/vasjpan2
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]

 

[mike]

WHat P=VI values are safe to leave plugged in indefinitely (clock or phone)?

I still remember a 1970s Readers Digest on a fire from a 1950s
telephone adaptor..

- = -
Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm http://www.facebook.com/vasjpan2
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]

nonsense question
P<>VI unless they're complex numbers.
All devices are safe according to the regulatory agency that approved
them using whatever standards they used.
ALL DEVICES FAIL.
Some catch fire.

I once read in readers digest that a house can catch fire. Does that
allow me
to make blanket statements about which houses are safe?
Hint: NO.