what is the purpose loopback cable or plug

For indoor areas, usually, IP21 & IP 44 are used because of their low-security level. We have to choose the IP rating of equipment by studying the location where we have to install that. Ingress Protection is detailed in international standard IEC-60529. Ingress Protection (IP) Rating provides protection of equipment against certain external influences such as dust, water, accidental contact, intrusions, and protection against direct contact. CRCA steel is also used as a material for manufacturing junction boxes for non-hazardous small scale industries Ingress Protection Rating (IEC-60529) SS316L & GFRP are widely used materials for both indoor & outdoor instrument junction boxes. Glass Fiber Reinforced Polymer (GFRP) is the widely used material for outdoor areas due to its high resistance to contamination from oils & its excellent mechanical properties & life expectancy. Materials with good corrosion resistance, high yield, high creep strength and tolerance to high ambient temperature is used for manufacturing junction boxes for outdoor areas that are exposed to changing environmental conditions. The most commonly used junction boxes in the offshore platforms are Ex e “increased safety” & Ex d “flameproof”. IECEx Certification is based on International Standard IEC-60079 Series & ATEX Directive is based on European Union (EU) Standard. Type SS316L is usually preferred because Type 303 & 304 are more subjected to pitting – type corrosion (API RP 14F & API RP 14FZ).Īs per API 14FZ, SS316L is capable of achieving ingress protection enabling those instrument junction boxes to be reasonable for use in hazardous areas and can be certified under ATEX Directive & IECEx Certification scheme. In offshore structures, the majority of instrument junction boxes are manufactured using stainless steel.

IEC-61892 (Mobile & Fixed Offshore Units, Electrical Installations).

IEC-60423 & IEC-62444 (Design, Construction & Selection of Gland plates & Cable Glands).

IEC-60079-14 (Electrical Installations design, selection & erection).

IEC-60079-7 (Equipment Protection by Increased Safety ‘e’.

IEC-60079-10.1.:2009 (Explosive Atmosphere – Classification of areas explosive, gas atmosphere).

IEC-60079 (Equipment – general requirements).

API RP 14F & API RP 14FZ (Design, Installation & Maintenance for Fixed & Floating Offshore petroleum facilities for Unclassified & class1, zone0, zone1 & zone2 locations.).

The following codes and standards are applicable while selecting a junction box.

Junction Box Selection Factorsįactors that have to be considered for selecting Junction Box are as follows. The selection of instrument junction boxes shall be governed by the specific electrical application and by the areas in which the junction boxes are installed.Ī junction box should have certification to exhibit proper hazardous area protection & ingress protection IP.

What is the purpose loopback cable or plug