Concrete Equipment Pads
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 6
to Rev 7
in Concrete Equipment Pads.
---
title: Concrete Equipment Pads
…28 unchanged lines
### The Contractor shall not reduce pad thickness, reduce reinforcement, or alter pad dimensions without written approval from the Engineer of Record.
−### Default values in this specification represent typical conditions for the 80% case (a 6 in. thick pad reinforced with #4 bars at 12 in. on center each way, top and bottom, with ASTM F1554 Grade 36 cast-in-place anchor bolts) and are not a substitute for project-specific structural design.
+### Default values in this specification represent typical conditions (a 6 in. thick pad reinforced with #4 bars at 12 in. on center each way, top and bottom, with ASTM F1554 Grade 36 cast-in-place anchor bolts) and are not a substitute for project-specific structural design.
# Referenced Standards {toc}
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### The Contractor shall obtain the equipment manufacturer's certified anchorage drawing for the actual ordered equipment — including the actual generator frame, the actual transformer base, the actual chiller unit — and shall not place anchors based on a catalog footprint, a model-family generic, or a "typical" arrangement.
−### The anchor bolt setting drawing is the most consequential submittal for an equipment pad and shall not be inferred from a generic equipment cut sheet; differences in frame size, fuel tank configuration, mounting accessory, or shipping split between catalog and ordered equipment routinely move anchor bolt positions by inches, and a pattern poured to the wrong drawing requires demolition and replacement of the pad. {note}
+### The anchor bolt setting drawing is the most consequential submittal for an equipment pad and shall not be inferred from a generic equipment cut sheet; differences in frame size, fuel tank configuration, mounting accessory, or shipping split between catalog and ordered equipment routinely move anchor bolt positions by inches, and a pattern poured to the wrong drawing requires demolition and replacement of the pad.
## Closeout Submittals {toc}
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- "Field test reports for pad concrete (compressive strength cylinders) indexed to pad"
- "Documentation of deviations and Engineer of Record's written disposition"
−default: [As-built dimensions of each pad (plan, top-of-pad elevation, as-set anchor pattern), Field test reports for pad concrete (compressive strength cylinders) indexed to pad, Documentation of deviations and Engineer of Record's written disposition]
+default:
+ - "As-built dimensions of each pad (plan, top-of-pad elevation, as-set anchor pattern)"
+ - "Field test reports for pad concrete (compressive strength cylinders) indexed to pad"
+ - "Documentation of deviations and Engineer of Record's written disposition"
```
…410 unchanged lines
# Embedded Items {toc}
−## General {toc}
+## All embedded items — conduits, grounding electrode conductors, drains, sleeves — shall be positioned and secured before the pad is poured.
+## Field cutting or coring of placed pad concrete to add a missed embed shall not be performed without written approval from the Engineer of Record.
+## Coring after the fact frequently cuts reinforcement or anchor embedment. {note}
−### All embedded items — conduits, grounding electrode conductors, drains, sleeves — shall be positioned and secured before the pad is poured.
−### Field cutting or coring of placed pad concrete to add a missed embed shall not be performed without written approval from the Engineer of Record.
−### Coring after the fact frequently cuts reinforcement or anchor embedment. {note}
−
## Conduit Stubs {toc}
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### Pad-mounted transformer pads, generator pads, and switchgear pads commonly require a grounding electrode connected at the pad. {note}
+### Grounding shall be provided in accordance with [[sync/grounding-and-bonding]] and, for substation-class transformer installations, in accordance with IEEE 80.
+
```datasheet
label: Embedded Grounding at Equipment Pad
…7 unchanged lines
default: "Ground rod(s) driven adjacent to pad with grounding electrode conductor stubbed through pad"
```
−
−### Grounding shall be provided in accordance with [[sync/grounding-and-bonding]] and, for substation-class transformer installations, in accordance with IEEE 80.
### For pad-mounted transformers, the grounding electrode conductor shall stub through the pad at the location designated on the manufacturer's anchorage and grounding drawing and shall be left of sufficient length to terminate inside the transformer tank or at the equipment ground bus per [[sync/grounding-and-bonding]].
### Coiling excess conductor inside the pad cavity is acceptable provided the coil does not interfere with cable termination.
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### The warranty shall not apply to damage caused by equipment loads exceeding the design basis, to damage from vehicle impact or other external causes, or to settlement caused by subgrade conditions outside the Contractor's scope.
### Material warranties for proprietary anchor systems, post-installed anchors, repair mortars, and joint sealants used in the pad work shall be passed through to the Owner and included in the closeout submittals.
−### Coordinate equipment-labeling and pad-mounted equipment identification with [[sync/equipment-labeling]] and the supporting equipment specifications [[sync/generators]] and [[sync/transformers]].
+### Coordinate equipment-labeling and pad-mounted equipment identification with [[sync/equipment-labeling]] and the supporting equipment specifications [[sync/generators]] and [[sync/medium-voltage-transformers]].