Bonding & Grounding http://ecmweb.com/taxonomy/term/19741/more en 55 Volts from Hot to Metal Box http://ecmweb.com/forums/electrical-101/bonding-grounding/55-volts-hot-metal-box <div class="node-body forum-body"><p>HI all can not understand how I get 55 volts from hot to a metal box that does not have grounds but is gfci protected and on arc fault breakes from a sub panel with 4 wire going to it neutral and ground seperated checked the neutral and ground at service with ohm meter clear everything seems to work fine but do not see why I would be getting it .thanks hope someone can help me understand</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/55-volts-hot-metal-box#comments Bonding & Grounding Sun, 30 Oct 2016 21:07:05 +0000 141961 at http://ecmweb.com Conductive Flooring http://ecmweb.com/forums/electrical-101/bonding-grounding/conductive-flooring <div class="node-body forum-body"><p>I have&nbsp;three questions.</p> <p>1)&nbsp;It appears that 25,000 ohms and below are no longer required by NFPA 77, but they are deferring to PPE, that is proper footwear.</p> <p>2)&nbsp;What are the requirements for testing in the NEC?</p> <p>3)&nbsp;Are there only requirements for conductive flooring in medical facilities now, NFPA 99?</p> <p>Thanks</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/conductive-flooring#comments Bonding & Grounding Fri, 19 Aug 2016 14:44:23 +0000 139251 at http://ecmweb.com grounding/ bonding http://ecmweb.com/forums/electrical-101/bonding-grounding/grounding-bonding <div class="node-body forum-body"><p>Why is it that the&nbsp;main panel has to be bonded to neutral wire when the neutral wire is already bonded in the meter pan, which in a lot of cases is just a foot or two away from each other?&nbsp;This is&nbsp;for a 200A,&nbsp;120/240V residential service.</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/grounding-bonding#comments Bonding & Grounding Tue, 19 Jul 2016 12:50:28 +0000 138031 at http://ecmweb.com Bonding Pools - Section 680.26 of the NEC http://ecmweb.com/forums/electrical-101/bonding-grounding/bonding-pools-section-68026-nec <div class="node-body forum-body"><p>I&#39;m looking for clarification of the requirements of Sec. 680.26 - specifically, what distance should a bonding conductor be from the edge of the pool? 680.26(1)(4) says 6 in., while 680.26(2)(4) says 18 in. to 24 in.</p> <p>I&#39;m looking at my 2008 Code book, but I don&#39;t think it changed in the 2014 edition of the Code.&nbsp;The topics are conductive shells and perimeter surfaces - there seems to be a difference in these two categories that I don&#39;t get.</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/bonding-pools-section-68026-nec#comments Bonding & Grounding Mon, 16 Nov 2015 11:23:11 +0000 129531 at http://ecmweb.com High potential shock from POS receipt. http://ecmweb.com/forums/electrical-101/bonding-grounding/high-potential-shock-pos-receipt <div class="node-body forum-body"><p>I have been racking my brain trying to come up with a solution to an issue at a car wash we recently installed a new POS System for. All equipment is grounded and bonded per the manufacturer&#39;s instructions. There are two POS computers, two gates and 5 in ground parking lot loop detectors. There have been multiple reports of customers getting shocked off of one of the machines when they take the receipt from the printer. It does not happen every time, and I have never been able to replicate or test for any stray voltages.</p> </div><p><a href="http://ecmweb.com/forums/electrical-101/bonding-grounding/high-potential-shock-pos-receipt" target="_blank">read more</a></p> http://ecmweb.com/forums/electrical-101/bonding-grounding/high-potential-shock-pos-receipt#comments Bonding & Grounding Sat, 15 Aug 2015 02:01:12 +0000 126221 at http://ecmweb.com Isolated Ground for DC Instruments http://ecmweb.com/forums/electrical-101/bonding-grounding/isolated-ground-dc-instruments <div class="node-body forum-body"><p><a name="_GoBack"></a>The term &ldquo;Isolated Ground&rdquo; seems to have a very specific meaning per the NEC. Article 250.146(D) specifies that for isolated receptacles, &ldquo;an insulated equipment grounding conductor [shall be] run with the circuit conductors.&rdquo;</p> <p>Implicit in this specification is the necessity to reduce the impedance in the isolated ground conductor for AC systems so that the over current protective device (OCPD) can function in the event of a short. This requirement is designed to provide safety and to reduce electrical noise.</p> </div><p><a href="http://ecmweb.com/forums/electrical-101/bonding-grounding/isolated-ground-dc-instruments" target="_blank">read more</a></p> http://ecmweb.com/forums/electrical-101/bonding-grounding/isolated-ground-dc-instruments#comments Bonding & Grounding Thu, 23 Jul 2015 17:52:50 +0000 125461 at http://ecmweb.com Tubs for Therapuetic Use http://ecmweb.com/forums/electrical-101/bonding-grounding/tubs-therapuetic-use <div class="node-body forum-body"><p>In 680.62(2)(B), what other metal parts,&nbsp;that &nbsp;are&nbsp;not part of the&nbsp;tub, are required&nbsp;to be bonded to the motor?&nbsp;Are water valves to be bonded to the motor if they are being fed by PVC water pipe?</p> <p>&nbsp;</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/tubs-therapuetic-use#comments Bonding & Grounding Thu, 09 Apr 2015 20:04:14 +0000 113611 at http://ecmweb.com Step-up transformer grounding http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-grounding <div class="node-body forum-body"><p>Hello to all,</p> </div><p><a href="http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-grounding" target="_blank">read more</a></p> http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-grounding#comments Bonding & Grounding Sat, 03 Jan 2015 03:01:10 +0000 105681 at http://ecmweb.com Step-up transformer for dedicated equipment http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-dedicated-equipment <div class="node-body forum-body"><p>I am involved with manufacturing a system used in industrial plants. (Sorry need to be vague, but this is a general question.) &nbsp;The system requires 3-phase, 380V-480V, 50/60hz supply at 30kVA. Some locations do not have this voltage available, so we require a step-up isolation transformer. I need to make the schematic that shows the basics of how to install the equipment.</p> </div><p><a href="http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-dedicated-equipment" target="_blank">read more</a></p> http://ecmweb.com/forums/electrical-101/bonding-grounding/step-transformer-dedicated-equipment#comments Bonding & Grounding Fri, 05 Sep 2014 21:29:19 +0000 52151 at http://ecmweb.com RV Park http://ecmweb.com/forums/electrical-101/bonding-grounding/rv-park <div class="node-body forum-body"><p>At an RV site, a recepticle has the hot tied to the 120V hot at bottom of meter and neutral and ground terminated to the neutral of meter at RV site. This is common at all sites. The main service has been bonded and there is only two hots (120/240V) and a neutral to each RV site. Any sugestions on the fix?</p> </div> http://ecmweb.com/forums/electrical-101/bonding-grounding/rv-park#comments Bonding & Grounding Wed, 09 Jul 2014 16:56:37 +0000 48681 at http://ecmweb.com