Panduit PN380 manual DC Output Wiring Sizing, Recommended AC Circuit Breaker and Wire Sizes

PANDUIT DPoE Power System User’s Guide	Issue 1.0
	Part Number: PN380
	N+1 DC Out

Rectifiers

1

2

3

Feed 1

AC In Feed 2

Feed 3

Figure 1: Individual AC Feed Wiring Architecture

Each individual AC feed should be protected using a circuit breaker as listed in Table 4: Recommended AC Circuit Breaker and Wire Sizes.

Table 4: Recommended AC Circuit Breaker and Wire Sizes

Type of	Number of	Part Number	Maximum	Maximum	Circuit	90° C
Feed	Rectifiers		Input	Rated AC	Breaker	Minimum
	on an AC		Voltage	Current (A)	Minimum	Wire Gauge
	Feed				value (A)	(AWG) to
						use at 30° C
						ambient
Individual		DPoEPWRR500	90	7	15	14
	1	DPoEPWRR500	180	3.5	15	14
AC
		DPoEPWRR1250	90	17.6	20	12
Feed
		DPoEPWRR1250	180	8.8	15	14

DC Output Wiring Sizing

There are two main considerations for sizing DC wire: ampacity and voltage drop. Ampacity refers to the safe current-carrying level as specified by U.S.-based organizations such as Underwriters Laboratories and the National Fire Prevention Association, which publishes the National Electric Code (NEC). Voltage drop is simply the amount of voltage loss in a length of wire due to ohmic resistance of the conductor. DC wire may be sized for either ampacity or voltage drop depending on branch load loop length and conductor heating. In general, ampacity considerations will drive wire selection for short loop lengths (less than 50 feet) and voltage drop will drive wire selection for long loop lengths (greater than 50 feet). The National Electric Code table 310.16 provides ampacity values for various sizes, bundles, and insulation temperature rated wire.

4