Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Power Distribution Units and Plug-In Devices
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### Busway plug-in tap boxes (bus plugs) are listed under UL 857 and installed under NEC Article 368. {note}
−### Both families are the same product category from a procurement standpoint -- a device that derives plug-connected branch power -- and are specified together here, with sub-type requirements called out where the listings diverge. {note}
+### Both families are the same product category from a procurement standpoint — a device that derives plug-connected branch power — and are specified together here, with sub-type requirements called out where the listings diverge. {note}
## The Contractor shall furnish PDUs and plug-in devices complete with the cord sets, inlet and outlet connectors, integral overcurrent protection, metering or monitoring intelligence, and mounting hardware required for a complete and operable installation.
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| Standard | Title |
|----------|-------|
−| NFPA 70 (NEC) Art. 368 | Busways -- plug-in busway and tap device installation, overcurrent protection, grounding, accessibility |
+| NFPA 70 (NEC) Art. 368 | Busways — plug-in busway and tap device installation, overcurrent protection, grounding, accessibility |
| NFPA 70 (NEC) Art. 645 | Information Technology Equipment (645.4 room qualification, 645.14 derived systems, 645.17 branch-circuit sizing) |
| NFPA 70 (NEC) Art. 240 | Overcurrent Protection (240.24(A)(1) busway plug-in accessibility per 368.17(C)) |
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| UL 60601-1 | Medical Electrical Equipment (PDUs in patient care vicinities) |
| IEC 60320 | Appliance Couplers for Household and Similar General Purposes (C13/C14, C19/C20) |
−| NEMA WD 6 | Wiring Devices -- Dimensional Requirements (NEMA locking and straight-blade configurations) |
+| NEMA WD 6 | Wiring Devices — Dimensional Requirements (NEMA locking and straight-blade configurations) |
# Submittals {toc}
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## Operating Environment {toc}
−### Specify the installed environment so the enclosure rating and temperature qualification can be confirmed. {note}
+### Specify the installed environment so the enclosure rating and temperature qualification can be confirmed.
```datasheet
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# Electrical Ratings {toc}
−## Input ratings shall be selected for the connected load with the continuous-load derating required by code, not for the nameplate ampacity. {note}
+## Input ratings shall be selected for the connected load with the continuous-load derating required by code, not for the nameplate ampacity.
## The Contractor shall load each unit such that the continuous load does not exceed 80% of the input circuit rating, per NEC 210.19(A)(1) and 210.20(A).
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## Input Voltage and Ampacity {toc}
−### The 80% case for data center racks is 208 V single-phase at 30 A (NEMA L6-30P inlet), delivering 24 A continuous. {note}
+### The most common configuration for data center racks is 208 V single-phase at 30 A (NEMA L6-30P inlet), delivering 24 A continuous. {note}
+### The input voltage of the plug-in unit shall be specified to match the connected load and the branch circuit serving the rack.
+
```datasheet
label: Input voltage
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```
+### The input circuit rating of the plug-in unit shall be specified to match the branch-circuit overcurrent protection serving the rack.
+
```datasheet
label: Input circuit rating
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```
+### The phase configuration of the plug-in unit shall be specified to match the input voltage and branch circuit serving the rack.
+
```datasheet
label: Phase configuration
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### Busway plug-in tap boxes are furnished across a wide ampacity span; select the standard rating that protects the tap conductors and matches the connected load. {note}
+### The busway plug-in tap rating shall be specified to protect the tap conductors and match the connected load.
+
```datasheet
label: Busway plug-in tap rating
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```
+### The short-circuit current rating of the busway plug-in tap box shall be specified to withstand the available fault current at its point of connection.
+
```datasheet
label: Short-circuit current rating (SCCR)
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# Connectors and Outlets {toc}
−## The inlet connector shall match the upstream branch circuit or busway tap and the unit's input rating. {note}
+## The inlet connector shall match the upstream branch circuit or busway tap and the unit's input rating.
### Specifying a 15 A NEMA 5-15P inlet on a rack PDU feeding high-density servers leaves no headroom; data center units shall use a 20 A or 30 A inlet on a matched circuit. {note}
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### IEC C13 outlets are rated 10 A / 250 V per IEC 60320, de-rated for North American use under UL 1363A; C19 outlets are rated 16 A / 250 V IEC. Loads exceeding roughly 1.5 kW per outlet shall be served from C19 outlets. {note}
−### GPU-dense and high-draw racks need a higher C19 count; ordering the wrong C13/C19 ratio forces field re-procurement and schedule delay. The 80% case for a 30 A 208 V unit is a 24-outlet mix of 16 x C13 and 8 x C19. {note}
+### GPU-dense and high-draw racks need a higher C19 count; ordering the wrong C13/C19 ratio forces field re-procurement and schedule delay. The usual configuration for a 30 A 208 V unit is a 24-outlet mix of 16 x C13 and 8 x C19. {note}
## Outlets in vibration-prone or high-traffic industrial environments shall provide cord retention, by IEC locking outlets or outlet retention clips, so friction-fit cords do not back out.
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# Construction and Finish {toc}
−## Enclosure and chassis materials shall suit the mounting form factor and environment. {note}
+## Enclosure and chassis materials shall suit the mounting form factor and environment.
### Vertical 0U units are typically extruded-aluminum bodies; horizontal and floor units are typically formed steel. Powder-coat finishes suit data center and commercial environments; anodized aluminum suits the extruded vertical units. {note}
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# Cord Sets and Cable Management {toc}
−## Each cord-and-plug connected unit shall be furnished with an input cord of the specified length and connector; the cord shall reach the upstream receptacle without splices or extension. {note}
+## Each cord-and-plug connected unit shall be furnished with an input cord of the specified length and connector; the cord shall reach the upstream receptacle without splices or extension.
−### The 80% case for a rack PDU input cord is 10 ft. Longer cords are special-order and shall be confirmed against the receptacle location before ordering. {note}
+### The most common rack PDU input cord is 10 ft. Longer cords are special-order and shall be confirmed against the receptacle location before ordering.
## For busway plug-in tap boxes, the supplied cord set or drop shall reach the served equipment from the engagement height without trip hazard or tension on the plug.
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### Where the engagement height is set by the busway elevation, indicate it on the drawings rather than fixing it here. {note}
+### The busway tap box engagement height shall be specified in feet above finished floor, or indicated on the drawings where governed by the busway elevation.
+
```datasheet
label: Busway tap box engagement height
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default: []
```