Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
When they say to only load fire alarm circuit to 60% how is that figured without knowing power supply or how much each device draws? Trying to determine how devices on a ckt. TY!
Typically it is based on the capacity of the circuit. On a Siemens Firefinder XLS SLC loop, for example, you can have 252 addressable devices. If you limit the design to 60%, that would be only 151 devices allowed in your design. For notification appliance circuits, the limit would be based on current draw. Again, the Siemens ZIC-4A card has 4 notification appliance circuits on it with a max of 3 amps per circuit. Your design can't put more than 1.8 amps worth of notification appliances on any circuit.When they say to only load fire alarm circuit to 60% how is that figured without knowing power supply or how much each device draws? Trying to determine how devices on a ckt. TY!
Horizontal IDC & NAC circuits from DGPWhat kind of circuits? Are you referring to the tap connections of FA panels to a riser?
engineerWho is 'they'?
Please see post #4.you can't design a circuit without knowing what you are using, It's like anything else we do.
look up the amp draw of the devices and then your panel or power supply and go from there. I never knew the circuit load could not be more than 60 %. I thought it was 20 or 25% extra reserve capacity.