{"id":4872,"date":"2026-11-09T15:16:45","date_gmt":"2026-11-09T07:16:45","guid":{"rendered":"https:\/\/www.toptaggroup.com\/?p=4872"},"modified":"2026-11-09T15:16:45","modified_gmt":"2026-11-09T07:16:45","slug":"card-access-control-doors-buying-guide","status":"publish","type":"post","link":"https:\/\/www.toptaggroup.com\/it\/card-access-control-doors-buying-guide\/","title":{"rendered":"Card Access Control Doors: What to Specify Before You Buy"},"content":{"rendered":"<p>A 22-storey office tower in Manila ordered 38 card access control doors with 280 kg electromagnetic locks, all mounted on 4 mm aluminium-framed glass. Six of them failed the holding test on the first night: the armature plate flexed with the frame, and the effective force was closer to 90 kg. The locks were fine. The doors were not.<\/p>\n<p>That order went out with a reader model, a card type and a lock part number on it. It had nothing about the door itself, which is where card access control doors are actually decided.<\/p>\n<h2>Start With the Door, Not the Reader<\/h2>\n<p>Most card access control doors fail at the frame, not at the reader. Before anyone quotes hardware, three facts about the door decide what will work:<\/p>\n<ul>\n<li>Frame material and thickness. Steel takes a maglock directly. Aluminium storefront and glass need a bracket, and the bracket has to be anchored into structure, not cladding.<\/li>\n<li>Leaf weight and swing. Heavy timber and steel doors need an electric strike or electromechanical lock; a maglock on a warped leaf will hold on the bench and fail on the door.<\/li>\n<li>Whether the door is on an escape route. That single question changes the lock type, the wiring and the fire approval.<\/li>\n<\/ul>\n<p>Ask what the card access control doors are expected to do in a power cut and in a fire alarm. If the answer is vague, the specification is already wrong.<\/p>\n<h2>Four Layers You Are Actually Buying<\/h2>\n<p>Four layers sit behind most card access control doors, and they are usually quoted by four different suppliers:<\/p>\n<ul>\n<li>Reader. 125 kHz, 13.56 MHz, dual-band or biometric. Decides which cards work and how far the user stands.<\/li>\n<li>Controller. One per door or one per four doors, holding the user list, time zones and event log. Decides what happens after the reader reads.<\/li>\n<li>Lock. Maglock, electric strike, electromechanical lock or bolt. Decides whether the door physically opens.<\/li>\n<li>Exit and monitoring. Request-to-exit sensor, push button, door position switch, and the alarm relay that releases the lock.<\/li>\n<\/ul>\n<p>A cheap reader on a good controller with the wrong lock is a callback. A good lock with no door position switch is a silent failure: the system believes the door is closed when it is not.<\/p>\n<h2>Fail-Safe or Fail-Secure<\/h2>\n<p>Fail-safe and fail-secure describe what card access control doors do when power drops. Fail-safe unlocks. Fail-secure stays locked.<\/p>\n<p>The default in most commercial buildings is fail-safe on escape routes, because people have to get out without a key. Ask the fire consultant before you fix the fail state on card access control doors. It is a code question, not a preference. Fail-secure belongs on server rooms, cash offices and storage holding controlled goods, and even there the egress side usually needs a mechanical override.<\/p>\n<p>A distribution centre in Nairobi specified fail-secure on all 120 doors because the security team wanted nothing open at night. The fire inspection failed 26 of them: those doors sat on escape routes. Retrofitting strikes, request-to-exit sensors and alarm relays cost more than the original lock package.<\/p>\n<h2>Cards and Fobs That Match the Reader<\/h2>\n<p>Cards and fobs are the cheapest part of card access control doors, and the most political. Three families cover most projects:<\/p>\n<ul>\n<li>125 kHz read-only, EM4100 and compatible. Cheap, long range, no encryption, easy to clone.<\/li>\n<li>13.56 MHz MIFARE Classic. Sector-based, widely used for printing and campus cards, also cloneable if keys leak.<\/li>\n<li>13.56 MHz DESFire EV2 or EV3, and HID iCLASS. AES-based, used where the card carries payment or identity value.<\/li>\n<\/ul>\n<p>Mixing families on one door needs a dual-band reader, and dual-band does not fix format. A reader that lists MIFARE and EM does not accept a DESFire card unless the controller and the encoding match. Check the exact chip family, not the frequency.<\/p>\n<h2>Power, Cable and Lock Force<\/h2>\n<p>Power is the quiet failure mode on card access control doors. A 12 V maglock draws 0.5 to 0.8 A at hold, and the inrush is higher. Twenty doors on one 5 A supply will work on the bench and drop out at 2 a.m.<\/p>\n<p>Two numbers to put in the specification:<\/p>\n<ul>\n<li>Cable. 18 AWG is fine to about 30 m for a single lock circuit. Beyond that, voltage drop at 12 V eats the holding force.<\/li>\n<li>Lock force. The rated number assumes a clean, flat armature contact on rigid steel. On a flexing frame, expect 30 to 50 percent of the rating, and design the bracket before the lock.<\/li>\n<\/ul>\n<p>Outdoor doors also need IP65 readers and a tamper contact, or the first rainy season becomes a service contract. Most callbacks on card access control doors trace back to supply and cable, not to the reader.<\/p>\n<h2>What to Put in the Specification<\/h2>\n<p>A specification for card access control doors should fit on one page, and it should survive a change of installer:<\/p>\n<ul>\n<li>Door schedule with frame material, leaf weight, and whether the door is on an escape route.<\/li>\n<li>Reader family and chip model, plus the encoding format and who encodes the cards.<\/li>\n<li>Lock type per door, with the fail state written out door by door.<\/li>\n<li>Controller model, door count per controller, and the event log retention.<\/li>\n<li>Power supply size, cable gauge, and the distance from the panel to each lock.<\/li>\n<li>Exit devices, alarm relay, and the sequence tested at handover.<\/li>\n<\/ul>\n<p>At handover, test five things on every door: card read at the real angle, release on alarm, release on power loss where specified, door position reporting, and re-lock time. A door that passes four of five will fail in month three.<\/p>\n<p>Send us the door schedule and the card type, and we will price the card access control doors as one package: reader, controller, lock and exit hardware matched to each opening. For the credential side, the\u00a0<a href=\"https:\/\/www.toptaggroup.com\/it\/rfid-cards-for-access-control\/\">RFID cards for access control<\/a>\u00a0guide compares 125 kHz and 13.56 MHz, and the\u00a0<a href=\"https:\/\/www.toptaggroup.com\/it\/rfid-key-fob-buying-guide\/\">RFID key fob guide<\/a>\u00a0covers fob formats before you bulk order. For hardware, start from our\u00a0<a href=\"https:\/\/www.toptaggroup.com\/it\/products\/access-control-rfid-reader\/\">access control RFID reader<\/a>\u00a0and the\u00a0<a href=\"https:\/\/www.toptaggroup.com\/it\/products\/door-access-machine\/\">intelligent door access machine<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>A 22-storey office tower in Manila ordered 38 card access control doors with 280 kg electromagnetic locks, all mounted on 4 mm aluminium-framed glass. Six of them failed the holding test on the first night: the armature plate flexed with the frame, and the effective force was closer to 90 kg. The locks were fine. [&hellip;]<\/p>","protected":false},"author":3,"featured_media":4873,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[355],"tags":[1556],"acf":[],"_links":{"self":[{"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/posts\/4872"}],"collection":[{"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/comments?post=4872"}],"version-history":[{"count":0,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/posts\/4872\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/media\/4873"}],"wp:attachment":[{"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/media?parent=4872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/categories?post=4872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.toptaggroup.com\/it\/wp-json\/wp\/v2\/tags?post=4872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}