add_action( 'init', 'my_deregister_heartbeat', 1 ); function my_deregister_heartbeat() { global $pagenow; if ( 'post.php' != $pagenow && 'post-new.php' != $pagenow ) wp_deregister_script('heartbeat'); }

П-274М по ТУ 16-505.221-78. Провод полевой связи (полевка)



Провод предназначен для полевой связи. Допускается прокладка в грунте, по земле, подвеска на опорах, кратковременная прокладка через водные преграды.


ТОКОПРОВОДЯЩАЯ ЖИЛА – скручена из 3-х стальных оцинкованных проволок диаметром 0,3 мм и 4-х медных проволок диаметром 0,3 мм. В центре расположена стальная проволока, в наружном повиве – медные и стальные проволоки по схеме: 2 медные + 1 стальная + 2 медные + 1 стальная.
ИЗОЛЯЦИЯ – светостабилизированный полиэтилен высокой плотности толщиной 0,5 мм.
СКРУТКА – две изолированные жилы максимальным диаметром 2,3 мм скручиваются в пару с шагом 80-100 м.

Электрическое сопротивление токопроводящей жилы не более 65 Ом/ км.
Электрическое сопротивление изоляции после 1 часа пребывания в воде при температуре 20°С не менее 1000 Мом/км.
Рабочая температура – от -50°С до + 65°С.
Разрывное усилие изолированной жилы не менее 392Н.
Масса провода не более 15 кг/км.
Строительная длина – 500м±10 м.
Срок службы проводов не менее 15 лет.



Число и номинальное сечение жил, мм2

Конструкция токопроводящей жилы

Радиальная толщина изоляционно-защитной оболочки, мм, не менее

Наружный диаметр изолированной жилы, мм, не более

Расчетная масса, кг/км







диаметр, мм



диаметр, мм

П-274 М









П-274 М1









П-274 М2










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