NESC Line Relations: Clarifying Section 220.B.2.b

In summary, the conversation is discussing a confusing section (220.B.2.b) of the NESC, which deals with supply circuits on support structures. There is confusion about the requirement of a 30 inch climbing space from the ground and whether it refers to the ground conductor or not. The phrase "climbing space" refers to the space left for a worker to climb the pole for maintenance purposes.
  • #1
MitYeltu
8
0
I have a question about a confusing section of the NESC (not that many sections are not confusing, but this is my current issue).

Section 220.B.2.b reads as follows
That the supply circuits be placed on the end and adjacent pins of the lowest through signal
support arm and that a 750 mm (30 in) climbing space be maintained from the ground
up to a point at least 600 mm (24 in) above the supply circuits. The supply circuits shall be
rendered conspicuous by the use of insulators of different form or color from others on the
pole line or by stenciling the voltage on each side of the support arm between the pins carrying each supply circuit, or by indicating the voltage by means of metal characters.

This section has to do with supply lines of 600V or less and carrying less than 5kW coming to a support structure carrying other classes of lines. I believe there is a word missing, but can't prove it.

The confusion, at least for me, is the 30 climing space from ground. I suspect that must be the ground CONDUCTOR, but since the code is notoriously anal about its application, I can't justify that thought. Can somone provide some clarification?

Thanks.
 
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  • #2
Ping @Tom.G can you make sense of this spring clean post? I don't understand the phrase "climbing space".
 
  • #3
The space left open for a worker to climb the pole to do maintenance.
 
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Related to NESC Line Relations: Clarifying Section 220.B.2.b

1. What is NESC Line Relations?

NESC Line Relations is a set of guidelines and rules established by the National Electrical Safety Code (NESC) for the safe installation and operation of electric power and communication lines.

2. What does Section 220.B.2.b of NESC Line Relations clarify?

Section 220.B.2.b of NESC Line Relations clarifies the requirements for minimum vertical clearance between power and communication lines and other structures or objects.

3. Why is clarifying Section 220.B.2.b important?

Clarifying Section 220.B.2.b is important because it helps to prevent accidents and injuries by ensuring that power and communication lines are installed and maintained at a safe distance from other structures or objects.

4. What are the minimum clearance requirements outlined in Section 220.B.2.b?

Section 220.B.2.b states that the minimum vertical clearance between power and communication lines and other structures or objects must be at least 8 feet for voltages up to 50kV, and 10 feet for voltages over 50kV.

5. Who is responsible for ensuring compliance with Section 220.B.2.b?

The responsibility for compliance with Section 220.B.2.b lies with the owners and operators of electric power and communication lines, as well as contractors and workers involved in their installation and maintenance.

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