APPENDIX A

Table A-I

M&E l\f&Ei Group (mmlm) (ft) Category

I 305mm 1.0: Support Anns

/,., Effectively Grounded Equipment Cases

.. 0 Insulated Communication Conductors and II 455mm i1; Cables ' .. ' .... .... ,. Messengers

l .. , ........ .. Surge Protection Wires ...... , .... < Grounded Guys

~ ... :".. iI.' 230El

~23OCI III 610 mm URLP, 0 V to 750 V

< Noninsulated Communication Conductors

I' ...... ' .......... 23OC2, 0 V to 750 V Ii .. ,. . . ,. 23OC3, 0 V to 750 V .'/>i Ungrounded Cases of Equipment at 0 to 750 V

IV 760mm I. 2,5 23OC2, Greater than 750 V

I . ................... , 23OC3, Greater than 750 V

I:.,.. Open Supply Conductors, 0 to 750 V V 1.2 m ..... ~ t' URLP, Greater than 750 V to 22 kV

< i.' Ungrounded Cases of Equipment at Greater than ..... 750V to 22 kV

Open Supply Conductors, Greater than 750 V to VI 1.37 m . 4~5 22kV

LEGEND: URLP - Unguarded rigid live parts

R - Rigid = 305 mm (1.0 ft) NR - Nonrigid = 155 mm (1.5 ft) GI - Grounded or insulated = 0.0 m (0.0 ft) a - Bare, ungrounded, or open conductor or part = 152 mm (0.5 ft) M - Mechanical component = RlNR plus GIla E - Electrical Component

Grounded & Communication Conductor = 0.0 m (0.0 ft) Supply Line 0 V to 750 V = 152 mm (0.5 ft) Supply Line Greater than 750 V to 22 kV =760 mm (2.5 ft)

M&E - Sum of M and E values

RlNR GIIO M E

1.0/- 0.0/- 1.0 0.0

1.0/- 0.0/- 1.0 0.0

-/1.5 0.0/- 1.5 0.0

-/1.5 0.0/- 1.5 0.0

-/1.5 0.0/- 1.5 0.0

-11.5 0.0/- 1.5 0.0

-/1.5 0.0/- 1.5 0.0

/1.5 0.0/ 1.5 0.0

1.0/- -/0.5 1.5 0.5

-/1.5 -/0.5 2.0 0.0

-/1.5 0.0/- 1.5 0.5

-/1.5 0.0/- 1.5 0.5

1.0/- -/0.5 I.5 0.5

-/1.5 0.0/- I.5 1.0*

-/1.5 0.0/- 1.5 1.0*

-11.5 0.0/- 2.0 0.5*

1.0/- -/0.5 I.5 2.5

1.0/- -/0.5 1.5 2.5

-/1.5 -/0.5 2.0 2.5

NOTES: (1) Ungrounded guys and ungrounded portions of guys between guy insulators have clearances based on the highest voltage to which they are exposed. (2) An asterisk (*) beside a value indicates an exception to the legend.

229