The values given in Table 2-3 are approxi-
mate, and actual current draw will vary based
on specific equipment. It’s always best to use
an inductive amp clamp and create your own
log of current draw for every circuit on a boat.
This log can become a useful diagnostic aid
when problems do arise.
Measuring current draw with an inductive
amp clamp is not too time consuming. Before
testing any appliance for current draw, disconnect
the appliance from the boat circuitry and connect
it directly to a good battery with a pair of jumper30 electrical systems troubleshooting
cables. (The gauge of battery jumper cables is
usually sufficient to carry all the needed current
and obtain valid readings.) Set the inductive amp
clamp around the DC positive conductor to
measure the current draw and log the value. This
will provide the benchmark value to effectively
use the inTELLECT once the appliance is recon-
nected to the boat’s circuitry; if the inTELLECT
indicates anything less than the benchmark value,
there is excessive voltage drop in the circuitry.
This could be due to a loose or corroded connec-
tion or a wire that is too small for the job.The electrical load requirement worksheet from ABYC Standard E-11.
(Courtesy ABYC)