{"version":"1.0","provider_name":"Electrical Riddle","provider_url":"https:\/\/electrical-riddle.com\/fa","author_name":"Electrical Riddle","author_url":"https:\/\/electrical-riddle.com\/fa","title":"Transformer Riddle No.90 - Ground resistance to restrict 750 mA - Electrical Riddle","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"6450PVUWJa\"><a href=\"https:\/\/electrical-riddle.com\/fa\/forums\/topic\/1064\/\">Transformer Riddle No.90 &#8211; Ground resistance to restrict 750 mA<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/electrical-riddle.com\/fa\/forums\/topic\/1064\/embed\/#?secret=6450PVUWJa\" width=\"600\" height=\"338\" title=\"&#8220;Transformer Riddle No.90 &#8211; Ground resistance to restrict 750 mA&#8221; &#8212; Electrical Riddle\" data-secret=\"6450PVUWJa\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/electrical-riddle.com\/wp-includes\/js\/wp-embed.min.js\n<\/script>","description":"please guide, how to calculate Neutral Ground Resistance for transformer (630kVA, 11\/0.433kV) for neutral earthing to limit the earth leakage current to 750 mA as per recommendation in hazardous area locations. Dear Sir, please guide, how to calculate Neutral Ground Resistance for transformer (630kVA, 11\/0.433kV) for neutral earthing to limit the earth leakage current to &hellip;  \u0627\u062f\u0627\u0645\u0647 \u00bb"}