Joint Termination Regulations

Joint Termination Regulations and other directives while the Fiscal Division checked the accounting methods followed in the termination action. Representatives of the chief s office, moreover, reviewed all terminations of less than 5,000 on periodic visits to field installations. ... 

Under provision of the Joint Termination Regulations, contract review boards were set up at the various CWS installations. In most instances these boards were entirely military and the officers who sat on them were of lower rank than the negotiating officer submitting the proposed settlement for review. "Ordinarily, the report states, "such a review board would not be likely to question the acts of a superior officer. The report recommended that in any future emergency the selection of members of... 

An overload may result in currents of two or three times the rated current flowing in the circuit. Short-circuit currents may be hundreds of times greater than the rated current. In both cases the basic requirements for protection are that the fault currents should be interrupted quickly and the circuit isolated safely before the fault current causes a temperature rise or mechanical effects which might damage the insulation, connections, joints and terminations of the circuit conductors or their surroundings (lET Regulations 131). 

Fibre-optic cables look like steel wire armour cables (but of course they are lighter) and should be installed in the same way, and given the same level of protection, as SWA cables. Avoid tight-radius bends if possible and kinks at all costs. Cables are terminated in special joint boxes which ensure cable ends are cleanly cut and butted together to ensure the continuity of the light pulses. Fibre-optic cables are Band I circuits when used for data transmission and must therefore be segregated from other mains cables to satisfy the lET Regulations. 

Terminations or joints in the cable may be made in ceiling roses, junction boxes, or behind sockets or switches, provided that they are enclosed in a non-ignitable material, are properly insulated and are mechanically and electrically secure (lET Regulation 526). All joints must be accessible for inspection, testing and maintenance when the installation is completed (lET Regulation 526.3). 

Will all terminations and joints be accessible upon completion of the erection period (lET Regulations 513.1 and 526.3.)... 

The use of junction boxes with fixed brass terminals is the method often adopted in domestic installations, since the joint boxes can be made accessible but are out of sight in the loft area and under floorboards. However, every connection must remain accessible for inspection, testing and maintenance (lET Regulation 526.3). 

There is a wide range of suitable means of connecting conductors and we shaii look at these in a moment. Whatever method is used to connect iive conductors, the connection must be contained in an enciosed compartment such as an accessory for example, a switch or socket box or a junction box. Aitemativeiy, an equipment enclosure may be used for example, a motor enclosure or an enclosure partly formed by non-combustible building material (lET Regulation 526.5). This is because faulty joints and terminations in live conductors can attain very high temperatures due to the effects of resistive heating. They might also emit arcs, sparks or hot particles with the consequent risk of fire or other harmful thermal effects to adjacent materials. 

Joints and connections are often the circuit locations most vulnerable to failure because they are frequently not entirely suitable for their purpose or because of poor workmanship or because of inadequate maintenance. An example may be the use of terminal blocks to joint cables - the blocks usually do not have strain relief and it is frequently the case that conductors are left exposed to be touched. This Regulation aims to ensure that joints and connections are both mechanically and electrically suitable. 

Regulation 542-02-03 is concerned with the corrosion of earth electrodes. According to BS 7430 1991, the British Standard Code of Practice on earthing, most buried earth electrodes suffer from corrosion, but provided this is not excessive, the electrodes are effective. It is important, however, to avoid corrosion of the electrode terminal. The joint should not employ metals in contact which are widely separated in the electrochemical series, and moisture and damp air should be excluded from the joint by taping or painting. 

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