OCPD feeder

[mathyou8972]

what size feeder ocpd is required for several branch circuit non motor loads utilizing 83 amps of continuous load and 135 amperes of non-continuous loads?

 

[infinity]

Is this a homework question?

Welcome to the Forum.

 

[Dennis Alwon]

what size feeder ocpd is required for several branch circuit non motor loads utilizing 83 amps of continuous load and 135 amperes of non-continuous loads?

See if this helps

215.2 Minimum Rating and Size.
(A) Feeders Not More Than 600 Volts.
(1) General. Feeder conductors shall have an ampacity not
less than required to supply the load as calculated in Parts
III, IV, and V of Article 220. Conductors shall be sized to
carry not less than the larger of 215.2(A)(1)(a) or (b).
(a) Where a feeder supplies continuous loads or any
combination of continuous and noncontinuous loads, the
minimum feeder conductor size shall have an allowable
ampacity not less than the noncontinuous load plus
125 percent of the continuous load.
(b) The minimum feeder conductor size shall have an
allowable ampacity not less than the maximum load to be
served after the application of any adjustment or correction
factors.

 

[petersonra]

The original poster asked about the overcurrent protection device rating. You have responded with the required ampacity of the conductors. They are two separate and completely different things

 

[Dennis Alwon]

The original poster asked about the overcurrent protection device rating. You have responded with the required ampacity of the conductors. They are two separate and completely different things

Once he knows the ampacity of the conductors he can choice an overcurrent protective device. The overcurrent protective device is calculated the same way

215.3 Overcurrent Protection. Feeders shall be protected
against overcurrent in accordance with the provisions of
Part I of Article 240. Where a feeder supplies continuous
loads or any combination of continuous and noncontinuous
loads, the rating of the overcurrent device shall not be less
than the noncontinuous load plus 125 percent of the continuous
load.