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Ask the Technician

Douglas Krantz -- Fire Alarm Engineering Technician, Electronic Designer, Electronic Technician, Writer





K Wrote:

Is there any clear info on the marking as to Font size? As for 10.6.5.2.3 is there a better description for a red marking, one that is uniform with code?

Thanks for any help. Thanks for you continued writings.


10.6.5.2.1 The location of the branch circuit disconnecting means shall be permanently identified at the control unit.
10.6.5.2.2 System circuit disconnecting means shall be permanently identified as to its purpose in accordance with the following:
(1) "FIRE ALARM" for fire alarm systems
(2) "EMERGENCY COMMUNICATIONS" for emergency communications systems
(3) "FIRE ALARM/ECS" for combination fire alarm and emergency communications systems
10.6.5.2.3 For fire alarm and/or signaling systems, the circuit disconnecting means shall have a red marking.
10.6.5.2.4 The red marking shall not damage the overcurrent protective devices or obscure the manufacturer's markings.

Douglas Krantz Wrote:

Mostly, the Code is there to enforce the use of common sense.

I'm not sure there is anything else in the code except an unwritten command that says "Make Sure the Labels Can Be Read and Understood by Normal People Under Normal Circumstances".






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Electrical Flow


On this website, most references to electrical flow are to the movement of electrons.

Here, electron movement is generally used because it is the electrons that are actually moving. To explain the effects of magnetic forces, the movement of electrons is best.

Conventional current flow, positive charges that appear to be moving in the circuit, will be specified when it is used. The positive electrical forces are not actually moving -- as the electrons are coming and going on an atom, the electrical forces are just loosing or gaining strength. The forces appear to be moving from one atom to the next, but the percieved movement is actually just a result of electron movement. This perceived movement is traveling at a consistent speed, usually around two-thirds the speed of light. To explain the effects of electrostatic forces, the movement of positive charges (conventional current) is best.

See the explanation on which way electricity flows at www.douglaskrantz.com/
ElecElectricalFlow.html
.