Is it possible to connect outlets with a loop in the clinic?
Hello. When installing wiring in the wards and rooms of the hospital, the contractor uses the connection of sockets with a cable, i.e. power comes to the first outlet and then goes through jumpers, from the outlet to the outlet. Please tell me, is there a document regulating the connection of outlets and are such connections (by cable) allowed in medical institutions? Thank you in advance for your reply.
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Hello! If we take into account PUE 1.7.144, then:
“The connection of each open conductive part of the electrical installation to the zero protective or protective grounding conductor shall be carried out using a separate branch. Sequential inclusion of exposed conductive parts in the protective conductor is not allowed.
The connection of the conductive parts to the main potential equalization system must also be carried out using separate branches.
The connection of the conductive parts to the additional potential equalization system can be carried out using either separate branches or connecting to one common inseparable conductor. ”
Which no longer allows you to connect the sockets with a loop.
Also:
GOST R 50571.28
710.55.3
Connecting power outlets in medical facilities of group 2 with the medical IT system.
For each place of treatment for patients, for example at the head of the beds, the following rules for installing power outlets must be observed:
- must be installed at least two outlets powered by separate lines or
- An individual overcurrent protection must be provided for each outlet.
If other systems (TN-S) are used in the part of the medical room, then outlets connected to the IT medical system must have:
- a design that precludes their use in another system, or
- clear, strong marking.
Which really complicates the electrical project, judging by the context, the two lines do not mean two phases, but apparently two real independent inputs, if you do not take into account the further postscript about the alternative in the form of protecting each outlet with a separate AV.
Although I could not find other aspects of this issue that were somehow related to this issue in the regulatory documentation.
It rather takes into account what will be powered from these outlets, if it’s just outlets at the beds of patients or some unimportant equipment such as table lamps — it’s permissible, and to supply various technological medical equipment such as ventilators and other life support systems, you need to achieve maximum reliability of the line, and connecting with a cable and a lot of contact connections in it contradicts this principle, here you need to make a star. Moreover, such equipment, as far as is known, belongs to the first category of power supply.