FireSecure Tools
Engineering Tools for Life Safety Systems
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DIP
Volt drop
PoE
CCTV storage
Ohm’s law
Battery (BS5839)
Voltage drop calculator
Basic copper resistivity estimation.
System
DC
AC
Supply voltage (V)
Current (A)
Route length one-way (m)
Conductor CSA (mm²)
0.5
0.75
1
1.5
2.5
4
6
10
Length model
Out + return
One-way
Limit (% drop)
Calculate
Notes: These calculators are for engineering estimation / planning. Verify critical results with standards, manufacturer data, and site measurement.