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|  DOE-HDBK-1092-98
4. Electric transmission lines (carrying 69 kV or more) and the tower or poles supporting them
shall be located not closer to explosives than:
a. Inhabited-building distance if the line in question is part of a system serving a large, offsite
area.
b. Public traffic route distance if loss of the line shall not create serious social or economic
hardships.
c. Underground utility separation distance criteria found in Table 5-1.
Table 5-1. Quantity-distance separation for
protection of underground service installations.a,b
Quantity of explosive
Distance, m (ft)
(maximum pounds)
100
26 (80)
200
26 (80)
500
26 (80)
1,000
26 (80)
2,000
26 (80)
5,000
26 (80)
10,000
26 (80)
20,000
28 (85)
50,000
36 (110)
100,000
46 (140)
250,000
62 (190)
a
If the planned building is designed to contain
the effects of an explosion, the formula D
(distance) = 3.0 w1/3 (w=weight) can be used to
determine separation distances for less than
20,000 lb.
b
Source: "DOE Explosives Safety Manual"
5.1.5.4 BUILDING SERVICE ENTRANCE
The electrical service entrance for explosives facilities shall be provided with:
1. An intermediate, metal-oxide surge lightning arrester on the primary side of the transformer
per ANSI/IEEE C62.11.
2. Surge arresters and surge capacitors on the supply side of the main service disconnect.
3. Interconnected grounding between the lightning arrester, surge arrester, surge capacitors,
service entrance ground, and building ground.
5-7
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