24VDC drop on wire

Status
Not open for further replies.
H

house

Member
What is the max 'allowable' voltage allowed to be dropped due to wire resistance on a 24VDC signal wire? I believe the CEC says 6% but didn't know if NEC was the same.
 
There is a percentage of the voltage that "may" be dropped based on wiresize. I'm looking for a percentage. The load is irrelevant.
 
sorry, the load isn't irrelevant, but I can determine the drop based on the load current....I'm just looking for what the NEC says is acceptable, if it says anything at all about it.
 
NEC only suggest a limit on higher voltage and i know of no rule on 24 volts. Check the device specs for min volts. I would think 22 volts would not likely cause trouble. Been told some newer air cond units are very pick about 24 volts ac
 
There is no NEC requirement only a footnote of 5%, that is a design requirement. I work a lot with 24 and 48 volt DC plants and our standard is 2%
 
Status
Not open for further replies.
Top