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Original General Order 95

 

Section III

 

Requirements for All Lines

 

Table 1

 

Basic Minimum Allowable  Vertical Clearance of Wire Above Railroads, Thoroughfares and Ground; Also clearances from Poles, Buildings, Structures or Other Objects
(Letter References Denote Modifications of Minimum Clearances as Referred to in Note Following this Table)

 

Case No


Nature of Clearance


Wire or Conductor Concerned

A
Span wires other than trolley span wires), overhead guys and messengers

B
Communication conductors (including open wire, cables and service drops), supply service drops of 0-750 volts

C
rolley Contact, feeder and span wires 0-5000 volts

D
Supply conductors of 0-750 volts and supply cables treated as in Rule 57.8

E
Supply Conductors and supply cables, 750-20,000 volts

F
Supply Conductors and supply cables more than 20,000 volts

1

Crossing above tracks of railroads which transport or propose to transport freight cars (max height 15 ft 1in) where not operated by overhead contact wires (a) (b) (c) (d)

25 ft

25 ft

22 ft

25 ft

28 ft

34 ft

2

Crossing or paralleling above tracks of railroads operated by overhead trolleys (b) (c) (d)

26 ft (e)

26 ft (e) (f) (g)

19 ft (h) (i)

27 ft (e) (g)

30 ft (g)

34 ft (g)

3

Crossing or along thoroughfares in Urban districts or crossings thoroughfares in rural districts (c) (d)

18 ft (j) (k)

18 ft (j) (l) (m)

19 ft

20 ft

25 ft (n) (o)

30 ft (o)

4

Above ground along thoroughfares in rural districts or across other areas capable of being transversed by vehicles or agricultural equipment.

15 ft (k)

15 ft (m) (n) (p)

19 ft

16 ft

25 ft (n) (o)

30 ft (o) (p)

5

Vertical ground in areas accessible to pedestrians only.

7 ft

10 ft (m) (q)

19 ft

12 ft

17 ft

25 ft (o)

6

Vertical clearance above buildings and bridges (or other structures which do not ordinarily support conductors and on which men can walk) whether attached or unattached.

8 ft (r)

8 ft (r)

8 ft

8 ft

12 ft

12 ft

7

Horizontal clearance of conductor from buildings (except generating and substations), bridges or other structures (upon which men may work) where such conductor is not attached thereto. (a) (t)

--------------

3 ft (u)

3 ft

3 ft (u) (v)

6 ft (v)

6 ft (v)

8

Distance of conductor from center line of pole, wheter attached or unattached (w) (x) (y)

--------------

15 in (a) (aa)

15 in (aa) (bb) (cc)

15 in (aa) (dd)

15 or 18 in (dd) (ee)

18 in (dd) (ee)

9

Distance of conductor from surface of pole, crossarm or other overhead line structure upon which it is supported, providing it complies with Case 8 above (x) (ee)

--------------

3 in (aa) (ff)

3 in (aa) (cc) (gg)

3 in (aa) (dd) (gg)

3 in (dd) (gg)

¼ pin spacing shown in Table 2 Case 15 (dd)

   

(a)    Shall not be reduced more than 5% because of temperature or loading  37

1.  Supply Lines    54.4-B1
2.  Communication Lines   84.4-B1

 

(b)    Shall be increased for supply conductors on Suspension insulators, under certain conditions    37
 
(c)    Special clearances are provided for traffic signal equipment    58.1-C
 
(d)    Special clearances are provided for street lighting equipment    58.2-B
 
(e)    Based on trolley pole throw of 26 feet.  May be reduced where suitably protected.    

1.  Supply Guys     56.4-B2
2.  Supply cables and messengers  57.4-B2
3.  Communication Guys     86.4-B2
4.  Communication cables and messengers   87.4-B2

 

(f)    May be reduced depending on height of trolley contact conductors.    

1.  Supply Service Drop     54.8-C5
2.  Communication service drops    84.8-D5

 

(g)    May be reduced and shall be increased depending on trolley throw    

1.  Supply conductors (except service drops)     54.4-B2
2.  Communication conductors (except service drops)    84.4-B2

 

(h)    Shall be increase where freight cars are transported.    

1.  Trolley contact and feeder conductors     74.4-B1 
2.  Trolley span wires   77.4-A

 

(i)    May be reduced for trolley contact and span wires in subways, tunnels and under bridges    

1.  Trolley contact conductors     74.4-E
2.  Trolley span wires    77.4-A

 

(j)    May be reduced at crossings over private thoroughfares and entrances to private property and over private property.

1.  Supply Service drops     54.8-B2
2.  Supply Guys     56.4-A
3.  Communication service drops    84.8-C2
4.  Communication guys    86.4-A

 

(k)    May be reduced along thoroughfares where not normally accessible to vehicles.    

1.  Supply Guys     56.4-A1
2.  Communication Guys    86.4-A1

 

(l)    May be reduced where within 12 feet of curb line of public thoroughfares    

1.  Supply Service drops      54.8-B1
 2.  Communication service drops   84.8-C1

 

(m)    May be reduced for railways signal cables under special conditions    84.4-A4
 
(n)    May be reduced in rural districts    

1.  Supply conductors, 750-20,000 volts, crossing roads or driveways      54.4-A2a
2.  Supply conductors, 750-20,000 volts, above agricultural areas and along roads  54.4-A2b  
3. Communication conductors along roads     84.4-A2

 

(o)    May be reduced for transformer, regulator or capacitor leads.    

1.  Transformer Leads     58.3-B1a
2.   Regulator or Capacitor Leads    58.4-B1

 

(p)    May be reduced across arid or mountainous areas    

1.  Supply Conductors of more than 20, 000 Volts   54.4-A1 
2.  Communication conductors    84.4-A1

 

(q)    Shall be increased or may be reduced under special conditions.    

1.  Increased for supply service drops on industrial or commercial premises    54.8-B3a
2.  Supply service drops on residential premises     54.8-B3b
3.  Communication conductors     84.4-A3
4.  Increased for Communication service drops on industrial or commercial premises    84.8-C3a
5.  Communication service drops on residential premises    84.8-C3b

 

(r)    May be reduced above roofs of buildings under special conditions    

1.  Supply overhead guys     56.4-G
2.  Supply service drops      54.8-B4
3.  Communication overhead guys    86.4-F
4.  Communication conductors and cables    84.4-E
5.  Communication service drops   84.8-C4

 

(s)    Also applies at fire escapes, etc.    

1.  Supply Conductors     54.4-H1
2.  Supply service drops on industrial or commercial premises     54.8-B4a
3.  Supply service drops on residential premises    54.8-B4b
4.  Communication Conductor    84.4-E

 

(t)    Special Clearances where attached to buildings, bridges or other structures    

1.  Supply conductors of 750-20,000 volts     54.4-H2
2.  Trolley Contact Conductors     74.4-E
3.  Communication Conductors   84.4-F

 

(u)    Reduced clearances permitted under special conditions    

1.  Supply service drops on industrial or commercial premises 54.8-B4a   
2.  Supply cables, grounded     57.4-G
3.  Communication cables beside buildings, etc.    84.4-E
4.  Communication conductors under bridges, etc.  84.4-F  
5.  Communication service drops.    84.8-C4

 

(v)    May be reduced under special conditions.    

1.  Supply conductors of 750-7500 volts     54.4-H1
2.  Supply transformer lead and bus wires where guarded    58.3-B2

 

(w)    May be reduced at angles in lines and transportation points    

1.  Supply conductors     54.4-D1
2.  Communication Conductors    84.4-D5

 

(x)    May be reduced for suitably protected lateral or vertical runs.    

1.  Supply bond wires     53.4
2.  Supply ground wires     54.6-B
 3.  Supply lateral conductors      54.6-C
4.  Supply vertical pins     54.6-D
5.  Supply risers     54.6-E
6.  Communication Ground Wires     84.6-B
7.  Communication lateral conductors     84.6-C
8.  Communication vertical runs     84.6-D
9.  Communication risers  84.6-E

 

(y)    Increased clearances for certain conductors     

1.  Unattached conductors on colinear lines and crossing lines 32.3  
2.  Unattached supply conductors      54.4-D3
3.  Supply Service drops on clearance crossarms     54.8-C2
4.  Supply Service drops on pole top extensions     54.8-C3
5.  Unattached Supply service drops     54.8-D
6.  Communication lines, collinear, conflicting or crossing     84.4-D3
7.  Communication conductors passing supply poles and unattached thereto    84.4-D4
8.  Communication service drops on clearance crossarms    84.8-D2
9.  Communication service drops on pole top extensions     84.8-D3
10.  Unattached Communication service drops   84.8-E

 

(z)    Special provisions for police and fire alarm conductors require increased clearances    92.2

(aa)    May be reduced under special provisions.    

1.  Supply conductors of 0-750 volts in rack configuration     54.4-D5
2.  Supply service drops from racks      54.8-F
3.  Supply cables and messengers attached to poles     57.4-F
4.  Communication conductors on communication poles     84.4-D
5.  Communication conductors on crossarms     84.4-D1
6.  Communication conductors attached to poles     84.4-D2
7.  Communication service drops attached to poles     84.8-B
8.  Communication cables and messengers     87.4-D
9.  Supply or communication cables and messengers on jointly used poles  92.1-B  
10.  Communication service drops on pole top extensions  92.1-C

 

(bb)    May be reduced for Class T conductors of not more than 750 volts and of the same potential and polarity    74.4-D

(cc)    Not applicable to trolley span wires    77.4-E

(dd)    Special clearances for pole-top and dead-end construction    

1.  Conductors dead-ended in vertical configuration on poles      54.4-C4
2.  Conductors dead-ended in horizontal configuration     54.4-D7
3.  Conductors in pole-top construction   54.4-D8

 

(ee)    Clearance requirements for certain voltage classifications    54.4-D2

(ff)    Not applicable to communication conductors    84.4-D

(gg)    Clearance from crossarms may be reduced for certain conductors    

1.  Suitably insulated leads to protected runs     54.4-E
2.  Leads of 0-5000 volts to equipment     54.4-E
3.  Leads of 0-5000 volts to cutouts or switches    58.5-C