Original Version

Rule 21.4

21.4    Insulated means separated from other conducting surfaces by a dielectric substance (including air-space) offering a high resistance to the passage of current. When an object is said to be insulated, it is understood to be insulated in a suitable manner for the condition to which it is normally subjected.

Strikeout and Underline Version

Rule 21.4

21.4    Insulated means separated from other conducting surfaces by a dielectric substance, (including air-space) offering a high resistance to the passage of current.  Air space when used as insulation shall be maintained by permanently forming the conductor or by adding additional mechanical means (e.g. spreader bar).  When an object is said to be insulated, it is understood to be insulated in a suitable manner for the condition to which it is normally subjected.

Final Version

Rule 21.4

21.4    Insulated means separated from other conducting surfaces by a dielectric substance, (including air-space) offering a high resistance to the passage of current.  Air space when used as insulation shall be maintained by permanently forming the conductor or by adding additional mechanical means (e.g. spreader bar).  When an object is said to be insulated, it is understood to be insulated in a suitable manner for the condition to which it is normally subjected.