On 7/31/2011 3:09 PM, John S wrote:
On 7/31/2011 4:02 PM, Owen Duffy wrote:

Owen

PS: hams universally ignore the guidance of NFPA 70 which makes
recommendation on conductors for antennas.

Maybe because NFPA 70 costs $150 US?

John

Free at the library, and at various sites for California Title 24.
http://rrdocs.nfpa.org/rrserver/brow...tricalCode2010

And the sections on antennas are widely quoted. I don't think cost of a
copy of the code is why hams don't follow it.

here you go:
II Receiving Equipment - Antenna Systems
Article 810.16 Size of Wire-Strung Antenna -Receiving Station
(A) Size of Antenna Conductors. Outdoor antenna conductors for
receiving stations shall be of a size not less than given in Table 810.16(A)
Table 810.16(A) Size of Receiving Station Outdoor Antenna Conductors
Minimum size of Conductors (AWG) where Maximum Open Span Length is:
Less than 11m 11m to 45m Over 45m
Al Alloy, hard
drawn copper 19 14 12

Cu Clad Steel,
Bronze, other high
strength matl 20 17 14

Or
III Amateur Transmitting and Receiving Stations - Antenna Systems
less than 45 m over 45 m
Hard drawn copper AWG 14 AWG 10
CCS, bronze, etc. AWG 14 AWG 12