MLO Grounding Report (3).pdf

MLO

NDACC

GONG

High Tower

Keeling

HELCO Transformers

Butler

Hi Tel

AEC Camera

ASIAA

Barnes

Simpson

Special Projects Panel Schnell

Ground Distribution Panel Ground Rod Chemical Ground Rod

#1

#2

#3

#4

#5

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1. A set of five ground distribution points was installed during the 1991 electrical system upgrade. Each point is connected to the next with 4/0 copper cable.

2. Each of the ground distribution points is equipped with a chemical ground rod.

3. The NDACC building is equipped with a set of eight chemical ground rods at the perimeter.

4. An additional ad-hoc ground distribution point can be found at the Special Projects Panel providing a ground tie-in for the buildings in the NE cluster (AEC, Uchida, Schnell, etc.)

5. The 1991 grounding system is properly exothermically bonded. Most ground distribution connections in the NE cluster are not properly bonded.

6. Many of the ground rods documented have become obscured by the loose surface rock or more recent construction making verification of the position and inspection of the condition of each rod problematic.

Grounding Bus #3 HELCO Transformers

Grounding Bus #2 High Tower

Grounding Bus #4 Keeling Building

Grounding Bus #5 Barnes Building

Grounding Bus #1 Butler Building

Ke el in g

De ck

Pu m p

Ro om

Ke el in g

Bu ild in g

Gr ou nd in g

Ro d

Ba rn es B ui ld in g

St ai r Bu ild in g

Co lso n Do m e

Gr ou nd in g

Ro d

Generator Pad

Camera Bldg.

Gr ou nd in g

Ro d

Bu tle r Bu ild in g

Do bs on

D om e

ML

S ol ar O bs er va to ry

Gr ou nd in g

Ro d

Hi gh

T ow er Fe nc e

Pe rim et er C ab le

Gr ou nd in g

Ro d kV A

Tr an sf or m er

0k

VA

T ra ns fo rm er Fe nc e

AEC

Bldg.

Special Projects Panel

Me t To we r

Tipping Bucket Pad

Precipitation Sample Site

Instrument Shelter

Sampling Pier

Vacant Pad

Solar Radiation Pier

Schnell Building

Uchida Building

Simpson Building

ND

AC

C Bu ild in g

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1. The five ground distribution panels were installed in the 1991 electrical upgrade

2. All runs are 4/0 copper cable

3. All cable bonds are exothermically welded to a termination lug

4. Cable clamps shown as solid dots are not exothermically welded

5. The Special Projects Panel was installed in 1987 and serves as the ground distribution point for the NE cluster

Butler Building Ground Distribution Panel High Tower Ground Distribution Panel