[ARC5] 125 VAC Line? Make Your BA's Happy,

[Glen Zook]

NFPA NEC (National Electrical Code) requires ALL grounds to be connected together to the main ground electrode (ground rod) at the electric entry panel or similar position.  This per Article 800 of the code.  Such is also a BICSI requirement.  BICSI is the international organization that sets the requirements, specifications, and so forth for the telecommunications industry.


Telephone technicians are required, by the telephone company, to connect the ground wires from protector blocks, etc., to the same ground system as the AC mains.  This is for lightning protection but can also "cure" other "ills" such as r.f. interference and so forth.


It is the same with amateur radio station grounds including those for r.f. and those for lightning protection.  NFPA NEC definitely requires those ground systems to be connected to the AC mains grounding system.  Again, this is for lightning protection.  If the ground systems are not connected together, then even a nearby strike can introduce potential differences that can cause serious damage to equipment, wiring, and so forth.  When grounds are properly installed, even direct lightning strikes can be diverted, to ground, with little or no equipment damage.

 Glen, K9STH 

BICSI RCDD (retired)

Website: http://k9sth.net
 

   

   From: WA5CAB--- via ARC5 <arc5 at mailman.qth.net>
 To: arc5 at mailman.qth.net 
 Sent: Sunday, January 17, 2016 11:32 PM
 Subject: Re: [ARC5] 125 VAC Line? Make Your BA's Happy,
  
Clearly, the safest way to mount the outlets is with the socket contact for the longer ground pin up.  I've done it that way for more than half a century.

The proper location for the neutral leg to be electro-mechanically connected to the ground leg is only where there is a copper connection to an actual ground rod.  At least in residential construction, this is usually only at the pole transformer.  Ground wires for the telephone system should not be connected to the electrical system.

In a message dated 01/17/2016 22:09:14 PM Central Standard Time, neilb0627 at gmail.com writes: 

As an afterthought to my piece about the insulated pins, sockets here
are *always* mounted with the live (Active) pin and its Neutral partner
mounted uppermost. The Earth pin is therefore always downmost and
is longer so that it enters first and leaves last. If you can get the Earth
pin entered on the correct angle, the other two will follow.

Back at the fuse box, Neutral is connected to Earth and then they
connect to a metal rod driven deep into the soil outside the building.
Everyone knows that the Active wire is the dangerous one - if you
touch it, there may be enough capacitance to ground (the real earth)
to deliver a severe shock.

73 de Neil ZL1ANM


Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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