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# Design Current

Discuss Design Current in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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#### hossamozi

Welcome to ElectriciansForums.net - The American Electrical Advice Forum

hi all
I want to ask you How can I calculate the design current of the motors such as Air conditioning ,
washing machine ,dishwasher? and what the rating of Each?

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D

#### DanBrown

You can normally find a nameplate on the appliance that tells you the relevent information.

M

hi all
I want to ask you How can I calculate the design current of the motors such as Air conditioning ,
washing machine ,dishwasher? and what the rating of Each?
hi there
with air conditioning you have to be carefull as the heat pump side tends to be more than the cooling on some types of condensing units.

but these days design of AC units has come along way most run ona 13 amp supply but for bigger units check with the manufacturer

rest as name plate allow for a higher start up current c type mcbs

cheers

H

#### hossamozi

hi there
with air conditioning you have to be carefull as the heat pump side tends to be more than the cooling on some types of condensing units.

but these days design of AC units has come along way most run ona 13 amp supply but for bigger units check with the manufacturer

rest as name plate allow for a higher start up current c type mcbs

cheers
can you give me formule to apply it to calculate the design current of it for example if we have 1.5 hp AC how can i calculate the design current?

D

#### desertbootz

On single phase it's easy peasy lemon squeezy to calculate current drawn ( I = P/V)
Three phase is a bit trickier, try this The 3 Phase Power Resource Site - Three Phase Power Solutions

Proper motors generally have the FLMC (Full Load Motor Current) on the Rating Plate. This is the current drawn at full power (not start-up!)

Size yr CB for FLMC (Type C or D are common options to handle Inrush or Startup Currents).

Size Overload Relays (if fitted) as per manufacturers charts (each manufacturer should publish Heater Characteristics to enable proper choice)

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