| 摘要 |
<p>Electrical currents and potentials in test leads associated with underground piping, cables and the like are monitored by a test station apparatus which essentially includes a collar supported by a tubular plastic conduit for subterranean implantation or carried aboveground by a carrier plate. A plastic tube projecting from diametrically-opposed sides of the conduit provides one form of anchor means to maintain the conduit within the ground while in another form the anchor means consists of a collar retained on the lower end of the conduit by a sleeve. Further embodiments include two different forms of carrier plates for aboveground support of the test station. A collet-type compression fitting is used to attach a collar onto the upper end of the conduit. Pedestals extend vertically from the end wall at opposed sides of an annular opening in the collar. The pedestals support a terminal block extending across the annular opening so that test leads pass through the collar for attachment at either side of the terminal block to terminals which are normally enclosed by a dome-shaped cover secured to the collar by threads or by one of different embodiments of interlocking members.</p> |
